SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-K
              ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                   For the fiscal year ended December 31, 1997
                         Commission file number 0-23044

                      AMERICAN MOBILE SATELLITE CORPORATION
             (Exact name of registrant as specified in its charter)

                        DELAWARE           93-0976127
                   (State or other     (I.R.S.  Employer 
                   jurisdiction of    Identification No.)
                   incorporation or
                    organization) 

           10802 Parkridge Boulevard
                  Reston, VA                          20191-5416
    (Address of principal executive offices)          (Zip Code)

       Registrant's telephone number, including area code: (703) 758-6000
        Securities registered pursuant to Section 12(b) of the Act: None
           Securities registered pursuant to Section 12(g) of the Act:
                     Common Stock, $0.01 per value per share
                                (Title of class)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  report(s),  and (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes X No

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated  by  reference in Part III of this Form 10-K or any  amendments  to
this Form 10-K. X

The aggregate market value of shares of Common Stock held by  non-affiliates  at
March 27, 1998 was approximately $142,757,227.

Number of shares of Common Stock outstanding at March 27, 1998:  25,176,726.

This Annual Report on Form 10-K omits certain supplemental financial information
required by Rule 3-09 of Regulation S-X.

                       DOCUMENTS INCORPORATED BY REFERENCE

Certain  information in the Company's  definitive  Proxy  Statement for its 1998
Annual Meeting of  Stockholders is incorporated by reference in Part III of this
Form 10-K.














                      AMERICAN MOBILE SATELLITE CORPORATION


                         1997 Annual Report on Form 10-K


                                     PART I

This Annual Report on Form 10-K includes "forward-looking statements" within the
meaning of Section  27A of the  Securities  Act of 1933 and  Section  21E of the
Securities  Exchange Act of 1934.  Such  statements are identified by the use of
forward-looking  words or phrases  including,  but not limited  to,  "believes,"
"intended,"   "will  be   positioned,"   "expects,"   "expected,"   "estimates,"
"anticipates" and "anticipated." These  forward-looking  statements are based on
the Company's  current  expectations.  All statements  other than  statements of
historical  facts included in this Annual Report,  including those regarding the
Company's financial position,  business strategy,  projected costs and financing
needs,  and plans and  objectives  of  management  for  future  operations,  are
forward-looking statements.  Although the Company believes that the expectations
reflected in such  forward-looking  statements are  reasonable,  there can be no
assurance  that  such  expectations  will  prove to have been  correct.  Because
forward-looking statements involve risks and uncertainties, the Company's actual
results  could  differ  materially.  Important  factors  that could cause actual
results  to  differ  materially  from the  Company's  expectations  ("Cautionary
Statements")  are disclosed under  "Business" and  "Management's  Discussion and
Analysis of Financial  Condition  and Results of  Operations,"  and elsewhere in
this Annual Report,  including,  without  limitation,  in  conjunction  with the
forward-looking statements included in this Annual Report. These forward-looking
statements  represent the  Company's  judgment as of the date hereof and readers
are cautioned not to place undue reliance on these  forward-looking  statements.
All subsequent written and oral forward-looking  statements  attributable to the
Company or persons  acting on behalf of the Company are  expressly  qualified in
their entirety by the Cautionary Statements. Readers should carefully review the
risk factors  described in other  documents  the Company files from time to time
with the  Securities  and Exchange  Commission,  including the Current Report on
Form 8-K filed on March 9, 1998, and Form 10-Q Quarterly  Reports to be filed by
the Company  subsequent to this Form 10-K Annual Report and any Current  Reports
on Form 8-K and registration statements filed by the Company.



                                      - 1 -





Item 1.  Business.

                                    Overview

American  Mobile  Satellite  Corporation  (the "Company" or "American  Mobile"),
through  its  subsidiaries,   is  a  leading  provider  of  nationwide  wireless
communications services, including data, dispatch, and voice services, primarily
to business  customers in the United States. On March 31, 1998,  American Mobile
acquired ARDIS Company ("ARDIS") from Motorola, Inc. ("Motorola"),  and combined
the ARDIS terrestrial-based  business with the satellite-based business operated
through its  subsidiary  AMSC  Subsidiary  Corporation.  The Company's  combined
network  offers a broad  range of  end-to-end  wireless  solutions  utilizing  a
seamless  network  consisting  of  the  nation's  largest,  most  fully-deployed
terrestrial wireless data network and a satellite in geosynchronous orbit.

American Mobile

American Mobile, a leading provider of nationwide mobile data and voice dispatch
service,  operates North America's first high-powered,  satellite-based  digital
mobile  communications  system.  American  Mobile  provides  a  broad  range  of
integrated end-to-end wireless solutions to land, sea and air-based customers in
a service area (the "Service Area") consisting of the continental United States,
Alaska, Hawaii, Puerto Rico, the U.S. Virgin Islands and U.S. coastal waters and
airspace.

American Mobile provides data service through two network configurations, either
a "satellite-only"  service network or a "multi-mode"  terrestrial and satellite
service network.  American Mobile's  satellite-only data  communications  system
provides data services primarily to long-haul trucking customers.  The Company's
multi-mode  communications  system uses the Company's  terrestrial and satellite
networks  to  provide   "least-cost   routing"  for   customers'   two-way  data
communications  by actively  seeking  connections to the lower cost  terrestrial
network before  automatically  using the Company's  satellite  network,  thereby
providing cost-effective nationwide coverage.

In addition to  providing  data  service,  American  Mobile  offers two forms of
mobile voice communications  service:  nationwide dispatch service and satellite
telephone service.  American Mobile is the only company that offers a nationwide
dispatch  service  which  allows  multiple  users  located  anywhere in American
Mobile's   extensive   service   area  to   share  a   single   connection   for
point-to-multipoint  communication using push-to-talk handsets.  American Mobile
markets its nationwide  dispatch service  primarily to field services users with
wide-area fleet  communications  needs.  American Mobile's  satellite  telephone
service  provides  traditional  voice,  fax and data service  through  satellite
terminals  that are  similar to cellular  phones.  American  Mobile  markets its
satellite  telephone  service  primarily  to  maritime  users,   including  both
commercial and  recreational  vessels,  as well as other market segments such as
government and public safety organizations.

As of  December  31,  1997,  American  Mobile  had  approximately  32,400  units
operating on its network.


                                      - 2 -





ARDIS

ARDIS,  a leading  provider of nationwide  wireless  data  service,  markets its
service  primarily  to  business  customers  with a need for  reliable,  two-way
wireless data  communications in the field services and transportation  markets.
The ARDIS  wireless data network  provides the widest breadth of coverage of any
single  provider  of  terrestrial  wireless  service in the United  States.  The
network  incorporates  approximately  1,700 radio  towers (base  stations)  that
provide  service to 425 of the  largest  cities and towns in the United  States,
including  virtually all metropolitan  areas. The network was designed and built
using Motorola technology to provide reliable two-way data communications,  deep
in-building  penetration and efficient  frequency usage. The extensive  coverage
and deep in-building  penetration provided by the ARDIS network is attractive to
customers who desire a single service  provider whose  nationwide  scope extends
from large  metropolitan  areas to  smaller  cities  and  towns.  Customers  use
applications  such as service call dispatch,  asset tracking,  and  peer-to-peer
communications  to achieve critical business  objectives  resulting in increased
productivity, profitability and customer satisfaction.

As of  December  31,  1997,  ARDIS had  approximately  55,400  units  (including
approximately  6,500 units,  common to both American Mobile and ARDIS) operating
on its network.


AMRC

American Mobile Radio Corporation, a subsidiary of AMRC Holdings, Inc. (together
with American Mobile Radio Corporation,  "AMRC") has been granted a license from
the  Federal  Communications  Commission  (the "FCC") to  construct,  launch and
operate a domestic satellite system for the provision of satellite-based digital
audio radio  service  ("DARS").  AMRC made a payment of $90 million to fully pay
for its DARS  license in October  1997.  The Company  currently  owns 80% of the
capital  stock of AMRC.  The  remainder  of AMRC is  owned by  WorldSpace,  Inc.
("WorldSpace"), a leading international DARS company that is planning to provide
DARS service to Latin America,  Africa and Asia. Through its investment in AMRC,
WorldSpace  has an option to increase its  ownership in AMRC to 72%,  subject to
FCC approval. It is anticipated that the proceeds resulting from the exercise of
the option will not be available  to the Company.  As  previously  reported,  on
March  20,  1998,   AMRC  entered  into  an  agreement  with  Hughes  Space  and
Communications  International,  Inc. to build two new  generation,  high-powered
HS-702  geostationary  orbit  satellites  for its digital  radio  service,  with
service anticipated to begin in the year 2000.


                                     History

The Company,  a Delaware  corporation,  was incorporated in May 1988 by eight of
the  initial  applicants  for  the  first  mobile  satellite  services  license,
following  a  determination  by the FCC that the public  interest  would best be
served by  granting  the  license to a  consortium  composed  of all willing and
qualified

                                      - 3 -





applicants. In March 1991, the Company transferred the mobile satellite services
license to its wholly owned subsidiary, AMSC Subsidiary Corporation.

In August 1989, the FCC authorized the Company to construct,  launch and operate
a mobile satellite communications system. For the system's mobile links, the FCC
assigned  to the  Company the  exclusive  license to 30 MHz of L-band  spectrum,
subject to international frequency  coordination.  L-band spectrum is considered
advantageous for mobile  communications  services because it is less affected by
radio propagation difficulties than are higher frequencies. The FCC licensed the
Company  to  provide  a  full  range  of  mobile   voice,   data  and   dispatch
communications  services via satellite to land,  air and sea-based  customers in
the Service Area.


                                 The Acquisition

On March 31, 1998, the Company acquired ARDIS (the  "Acquisition") in accordance
with a purchase agreement (the "Purchase  Agreement") entered into with Motorola
on December 31, 1997.  Subject to certain purchase price adjustment  provisions,
the Company  acquired  ARDIS for a purchase price of $100 million (the "Purchase
Price")  paid as follows:  (i) $50  million in cash,  paid at the closing of the
Acquisition;  (ii)  approximately  $38 million in shares of the Company's Common
Stock,  paid at the  closing of the  Acquisition;  and (iii)  approximately  $12
million  in shares of the  Company's  Common  Stock and  warrants  for shares of
Company's Common Stock only if, at the annual meeting of Company's stockholders,
the stockholders  approve the issuance of the additional  shares and warrants to
Motorola. The holders of approximately 76% of Company's Common Stock outstanding
and entitled to vote thereon have agreed with  Motorola  that they will vote for
approval of such issuance.

In connection with the  Acquisition,  the Company and its  subsidiaries  entered
into  agreements  with respect to three  financings and  refinancings:  (1) $335
million of Units  consisting  of 12 1/4% Senior  Notes due 2008 and  Warrants to
purchase  shares of Common  Stock of the Company;  (2) a $100 million  Revolving
Credit  Facility and a $100 million Term Loan Facility  (collectively,  the "New
Bank  Financing");  and (3) a $10 million  commitment  with  respect to Motorola
vendor  financing.  See  "Management's  Discussion  and  Analysis  of  Financial
Condition and Results of Operations - Liquidity and Capital Resources."

Upon completion of the  Acquisition,  ARDIS became a wholly-owned  subsidiary of
AMSC Acquisition Company, Inc. ("Acquisition  Company").  In connection with the
Acquisition,  the Company also transferred all of its rights, title and interest
in three additional subsidiaries -- American Mobile Satellite Sales Corporation,
AMSC Subsidiary  Corporation and AMSC Sales Corporation,  Ltd. -- to Acquisition
Company.  As a result,  each of these entities is a  wholly-owned  subsidiary of
Acquisition Company that, in turn, operates as a wholly-owned  subsidiary of the
Company. The Company continues to retain its direct ownership interest in AMRC.

The full benefits of a combination  of American  Mobile and ARDIS as a result of
the Acquisition  will require the integration of each company's  administrative,
finance, sales and marketing  organizations,  the coordination of each company's
sales efforts and the implementation of appropriate  operational,  financial and

                                      - 4 -



management systems and controls. There can be no assurance that the Company will
be able to integrate  the  operations  of American  Mobile and the ARDIS network
successfully  or, if successful,  that such  integration will yield the expected
benefits to the Company.


                                   The Network

Following the Acquisition,  the Company's  integrated  network consists of (i) a
satellite in geosychronous orbit with coverage of the continental United States,
Alaska, Hawaii, Puerto Rico, the U.S. Virgin Islands and U.S. coastal waters and
airspace,  and (ii) the largest two-way  terrestrial  data network in the United
States with  coverage of over 425 of the largest  cities and towns in the United
States,  including virtually all metropolitan areas. The network provides a wide
range  of  mobile  data  and  voice  services  in  multi-mode  and   single-mode
configurations.

Users of the Company's terrestrial and satellite  communications  network access
the network through subscriber units that may be portable,  mobile or stationary
devices. Generally,  subscriber units enable either data or voice communications
and are designed to operate over either the terrestrial data-only network or the
satellite  network,  which  provide  both  voice  and  data  communications.  In
addition,  the Company's multi-mode  subscriber equipment is designed to provide
least-cost  routing of data  messages  over both the  terrestrial  and satellite
networks.

Subscriber  units  receive and transmit  wireless  data or voice  messages  from
either terrestrial base stations or the Company's satellite, MSAT-2. Terrestrial
messages are routed to their destination via Company-owned data switches,  which
connect to the  public  data  network.  Satellite  messages  are routed to their
destination  via  satellite  data and voice  switches,  located at the Company's
headquarters,  which connect to the public data and switched voice  networks.  A
data switch located in Cedar Rapids links the terrestrial and satellite networks
for the delivery of the Company's multi-mode data service.

The Company's  terrestrial  network delivers superior  in-building  penetration,
completion  rates and response  times  compared to other  wireless data networks
through  the  use  of a  patented  single  frequency  reuse  ("SFR")  technology
developed by Motorola.  SFR technology enables multiple base stations in a given
area to use the same frequency.  As a result, a message sent by a subscriber can
be received by a number of base stations.  This  technology  contrasts with more
commonly used multiple  frequency  reuse ("MFR")  systems which provide for only
one  transmission  path  for a  given  message  at a  particular  frequency.  In
comparison  with  MFR  systems,   the  Company's  technology  provides  superior
in-building   penetration   and  response  times  and  enables  the  Company  to
incrementally  deploy  additional  capacity  as  required,  instead of in larger
increments as required by most wireless networks.




                                      - 5 -





                                Business Strategy

The Company's  objective is to maximize its revenues by  delivering  value-added
services to end users in specific market segments. To meet this objective and to
capitalize  upon the  competitive  advantages  resulting from the combination of
American Mobile and ARDIS, the Company intends to: (i) offer business  customers
a broad range of nationwide wireless service and end-to-end data solutions; (ii)
integrate  and  leverage  the  advantages  of  its  nationwide  terrestrial  and
satellite data networks; (iii) enhance market penetration by lowering customers'
"total cost of  ownership;"  and (iv) expand the use of  alternate  distribution
channels to accelerate network loading.

Offer Business  Customers a Broad Range of Nationwide  Wireless  Solutions.  The
Company believes its corporate customers prefer a single-source service provider
capable of delivering a broad range of efficient and cost effective solutions to
meet their need for mobile wireless communications. The Company believes that it
has and will  continue  to have a unique  strategic  advantage  in being able to
provide one-stop  shopping across a broad range of products,  including  two-way
paging and advanced  messaging,  packaged e-mail and LAN solutions,  custom data
applications,  dual mode  terrestrial/satellite  data,  and satellite  voice and
dispatch functions.

Integrate and Leverage Network  Advantages.  The Company has spent over a decade
developing and deploying its nationwide  terrestrial and satellite  networks and
now seeks to accelerate growth by leveraging its integrated network. Unlike many
competitors  with plans to build out limited  city-wide or regional  terrestrial
networks or to launch satellites,  the Company's technology infrastructure is in
place and operational today, with future network expansion  requirements arising
primarily  from  increased  customer  demand.  The  Company  believes  that this
integrated  terrestrial/satellite  network  provides key competitive  advantages
currently  unmatched by any  competitor:  virtually 100%  nationwide  geographic
coverage,  guaranteed  message delivery,  and, in the areas covered by the ARDIS
network,  deep  in-building  penetration.  By integrating  the operations of its
terrestrial and satellite  networks,  the Company  expects to achieve  operating
efficiencies  and  economies  of scale that it  believes  will lead to  improved
operating margins.

Enhance  Market  Penetration By Reducing  Customers'  "Total Cost of Ownership."
Historically,   the  most  significant   obstacle  to  the   implementation   of
enterprise-wide  wireless data  applications  has been the relatively high total
cost of  ownership.  The total cost of ownership  is comprised of three  primary
elements:  the cost of the subscriber unit, the required  investment in software
development,  and the monthly cost of network  access and usage.  In most of the
Company's  applications,  the monthly cost of network  access and usage has been
the least prohibitive of these elements.  Until recently,  subscriber unit costs
in excess of $3,000 and custom  software  investments  of up to several  million
dollars were common. By working with business  partners and vendors,  and making
strategic  software  investments,  the Company has  succeeded  in  significantly
lowering  customers' total cost of ownership.  New subscriber  units,  including
low-cost  two-way  messaging units and laptop modem cards, are now available for
$500 or less and  substantial  development  work is underway with several of the
Company's  vendors to accelerate  reductions of equipment  cost, unit weight and
size.  In the future,  the Company  expects that the increased  subscriber  unit

                                      - 6 -




volumes  associated  with recent large  contract  awards will lead to additional
unit price reductions. In addition, customers can now use off-the-shelf software
applications  that are relatively  inexpensive,  or in the case of the Company's
two-way  messaging  service,  free. The Company  believes that these lower price
points will accelerate the adoption of the Company's  services in its historical
markets,  and will enable the Company to develop new  markets,  such as wireless
point-of-sale and telemetry.


Expand Alternate  Distribution  Channels. The Company sells it service primarily
through a direct  sales  force and  resellers.  In order to  accelerate  network
loading,  the  Company  expects  to  expand  its  use of  indirect  distribution
channels.  To date,  the Company has entered into  agreements  with resellers to
penetrate  markets where such resellers have a market presence and significantly
greater  resources than the Company,  including  dedicated sales  personnel.  In
addition,  the  Company is in the  process of  establishing  relationships  with
existing paging  companies,  paging resellers,  and other targeted  distribution
partners to market two-way guaranteed  messaging services.  The Company believes
that the resale of its  network is an  alternative  that paging  companies  will
consider when assessing a move from one-way to two-way  messaging because it may
reduce  or   eliminate   the  need  for   additional   investment   in   network
infrastructure.  The  Company  intends to  utilize  paging  companies  and other
similar  partners with well  established  distribution  capabilities  to develop
markets outside of the Company's historical market segments.


                           Marketing and Distribution

The Company  markets its services  through four primary  distribution  channels:
direct sales, vertical resellers, horizontal resellers and dealers.


Direct Sales

The Company has a direct sales force who focus on the  requirements  of business
customers.  This sales  organization  is comprised of a national  accounts group
that  profiles  and  targets  specific  Fortune 500  accounts,  and a network of
regionally based  representatives  who specialize in specific industry segments.
Sales to national account targets generally require a sustained marketing effort
lasting several  months.  Prior to making a buying  decision,  a majority of the
accounts  exercise a due diligence  process where  competitive  alternatives are
evaluated.  The Company's  employees  often assist in  developing  justification
studies, application design support, hardware testing, planning and training.


Vertical Resellers

In  order  to  penetrate  quickly  certain  market  segments   characterized  by
specialized  technical  requirements  and/or unique business  applications,  the
Company leverages the capabilities of specialized  distribution partners.  These
relationships  enable the  Company to  penetrate  new  market  segments  without

                                      - 7 -




investing  in the  product,  training  and  development  requirements  typically
associated with entry into a new market segment.

The Company's resale arrangements are specifically  designed to accelerate entry
into the  wireless  telemetry  (utility  and alarm  monitoring),  point-of-sale,
maritime and government market segments. These business partners are responsible
for  development  of  the  end-user  solutions,  and  purchase  capacity  on the
Company's data network.

Value added service providers  ("VASPs")  represent one of the Company's primary
distribution  channels for maritime  satellite  telephony.  VASPs  purchase bulk
minutes,  resell at a margin, set the price, take risk of collection and perform
all service and billing functions.

The Company currently utilizes three specialized  government  resellers,  one of
which has included the Company's products on the general services administration
schedule.  The Company intends to expand the distribution  opportunities for its
terrestrial data products by also including them in these programs.

The Company also has various  private network  customers  ("PNCs") that purchase
bulk  satellite  capacity  from the  Company in the form of  dedicated  capacity
increments or channels.  PNCs use this capacity to support their own proprietary
networks  and  products,   and  maintain  all  associated   business  risks  and
responsibilities.


Horizontal Resellers

The Company utilizes a series of resale relationships  designed to reach a large
segment  of  the  mobile  workforce  that  does  not  require  integration  with
centralized  systems,  but  still has a broad  need for  two-way  messaging  and
wireless e-mail access.  Because these  applications are generic across numerous
industries, the segment is horizontally addressable,  and requires some level of
retail  presence.  To achieve  this  presence,  the Company is in the process of
establishing relationships with existing paging companies,  paging resellers and
other  targeted  distribution  partners to market two-way  guaranteed  messaging
services.  The  Company  also  maintains  relationships  with  manufacturers  of
personal  handheld  computing  devices,  who  include  the  Company's  marketing
material  with the device  packaging  to  provide  the  purchaser  the option of
wirelessly enabling a handheld computing device.


Dealer Channels

The  Company  also uses land mobile and  maritime  dealers  who  distribute  the
Company's  nationwide dispatch and satellite  telephony products.  These dealers
typically  have  strong  business  relationships  with  regional  public  safety
entities,  as well as with smaller field service fleets and maritime users.  The
Company believes that opportunities exist to capitalize on the strengths of this
channel  by  introducing  a  low  cost  terrestrial  data  device  with  minimum
integration requirements.  Typically these dealers serve as agents for sales and

                                      - 8 -




service and do not set pricing or provide billing and collection services. These
dealers  are  generally  compensated  with a modest  percentage  of the  service
revenue for which they are responsible.


Customer Concentration

After giving pro forma effect to the Acquisition, three existing customers, IBM,
NCR and  Pitney  Bowes,  accounted  for  26%,  7% and 5%,  respectively,  of the
Company's  recurring  service  revenue for the twelve months ended  December 31,
1997.  The loss of one or more of such  customers,  or any event,  occurrence or
development  which adversely  affects the  relationship  between the Company and
such customer could have a material adverse effect upon the Company.


                        Equipment; Supplier Relationships

The  Company  has   contracts   with  multiple   vendors  to  supply   equipment
configurations  designed to operate on each of its  operating  platforms.  These
devices are designed to meet the requirements of specific end-user applications.
The Company  continues to pursue  enhancements to these devices that will result
in additional desirable features and reduced cost of ownership. Although many of
the  components  of the  Company's  products  are  available  from a  number  of
different suppliers, the Company does rely upon a few key suppliers.

In connection with its mobile data communications service, the Company presently
has an agreement with Trimble  Navigation,  Limited to supply its satellite data
unit. In addition,  multi-mode data terminals are sourced from Rockwell Collins,
Inc. The Company also has contracted with Vistar,  Inc., a Canadian company, for
the development of a new multi-mode terminal.  The new terminal will incorporate
design  changes that will  simplify the  installation  process and allow for the
addition of enhancements  in a modular  fashion.  The Company  believes that the
price of multi-mode terminals will continue to decline in the coming years.

There are currently over 30 different  types of subscriber  units available from
15  manufacturers  that can  operate on the  terrestrial  network.  Examples  of
portable  subscriber units include  ruggedized laptop computers,  small external
modems,  handheld  or palmtop  "assistants,"  pen based  "tablets,"  and two-way
messaging devices, such as the RIM Interactive PagerTM.  Significant  developers
of devices  that are  compatible  with the  network  include  Motorola,  RIM and
Itronix.  Motorola and RIM  manufacture  modems  designed to be integrated  into
handheld field service  terminals,  telemetry  devices,  utility  monitoring and
security systems as well as other computing systems.  RIM recently has developed
the Interactive  PagerTM that supports the Company's two-way messaging  service.
Itronix  manufactures  the XC-6000,  a fully  ruggedized  laptop computer with a
standard keyboard and an integrated wireless modem.

Mobile  satellite  voice  telephones  are  offered  in  a  number  of  different
configurations  that deliver a variety of features and options to meet  specific
market needs. Mobile satellite telephones are currently available in land mobile
vehicle installed, fixed site, maritime, aeronautical, dual mode voice/direct to
home satellite  television and fully  transportable  (i.e.,  battery powered and
packaged in a briefcase)  configurations.  Subscriber  equipment  for  satellite
telephone service and nationwide  dispatch service includes data interface ports

                                      - 9 -





to allow connection to  communications  accessories such as personal  computers,
and global positioning  satellite ("GPS") tracking devices.  Recent enhancements
allow users to utilize the dispatch  product  remotely  from the vehicle,  via a
wireless  tether.  American  Mobile  continues  to add  enhancements  based upon
customer  requirements,  and has several  initiatives  that could  result in the
reduced cost of end-user devices.  The primary suppliers for the voice equipment
are  Westinghouse  Electric,  Inc.   ("Westinghouse")  and  Mitsubishi  Electric
Corporation.

Tandem  computer  provides  the  ARDIS  network  switching   computers  under  a
multi-year lease that extends through the year 2000, while AT&T provides network
services  including a nationwide  wireline data network,  and leased sites which
house regional ARDIS  switching  equipment.  The Company also has a relationship
with AT&T as its  vendor for  switched  inbound  and  outbound  public  switched
telephone  network  services.  The satellite  system  terminates  calls from its
telephone product via both the AT&T and Sprint networks.

ARDIS has executed  multiple  agreements  with Motorola that provide for certain
continued  support from  Motorola  with  respect to:  supply and support for the
ARDIS DataTAC  network  infrastructure;  ongoing  maintenance and service of the
ARDIS base stations; and lease administration  services for approximately 37% of
ARDIS' base station site leases. Additionally,  Motorola is expected to continue
to manufacture  modems compatible with the ARDIS network  infrastructure for use
in end-user devices.

Hughes Network Systems Ltd, of the United Kingdom, manufactures and supports the
key component to the Company's  multi-mode  and  satellite  messaging  products,
which  is the Land  Earth  Station  ("LES").  There  are  currently  four  LES's
operational.  The platform for the Company's voice products,  the communications
ground segment  ("CGS"),  depends upon products from multiple  vendors,  most of
which are generally  commercially  available.  Northern Telecom manufactures and
supports  the core voice  switch.  Digital  Equipment  Corporation  supplies the
computing platform that runs the CGS.

American  Mobile  jointly  owns  certain  patents,   technical  data  and  other
intellectual   property,   including  the  final  mobile  terminal   performance
specification  ("FMPS"),  developed by  Westinghouse,  with the Canadian  mobile
satellite service provider, TMI Communications and Company,  Limited Partnership
("TMI").  The Company  separately  owns other patents,  technical data and other
intellectual  property  developed by Westinghouse at the Company's sole expense.
Certain of the intellectual property used in the development of the CGS is owned
by Westinghouse or licensed from others.  The Company  believes its ownership of
and rights to  intellectual  property  relating to the CGS is sufficient for its
business purposes.

The  ARDIS  network,  and  certain  of its  competitive  strengths  such as deep
in-building penetration, is based upon SFR technology. Motorola holds the patent
for SFR technology.  ARDIS has entered into support  agreements with Motorola to
provide for certain support of the operations of the ARDIS network.

                                     - 10 -





However,   there  can  be  no  assurance  that  Motorola  will  not  enter  into
arrangements  with  the  Company's  competitors,   or  that  if  it  does,  such
arrangements would not have a material adverse effect on the Company.


                     Satellite Lease and Purchase Agreement

As  previously  reported,  on December  4, 1997,  the  Company  entered  into an
agreement with African  Continental  Telecommunications  Ltd. ("ACTEL") to lease
the  Company's  satellite,  "MSAT-2,"  (the  "Satellite  Lease  agreement")  for
deployment over sub-Saharan  Africa.  The five-year lease provides for aggregate
payments to the Company of $182.5  million.  Simultaneously,  the Company agreed
with TMI to acquire a one-half ownership interest in TMI's satellite,  "MSAT-1,"
(the "Satellite Purchase  Agreement") at an aggregate cost to the Company of $60
million,  payable  in  equal  installments  over  a  five-year  period;  certain
additional payments to TMI of up to one-half of additional net payments received
are  contemplated  in the event that  additional  benefits  are  realized by the
Company with respect to MSAT-2 after the initial five-year lease term. Under the
Satellite Purchase Agreement,  TMI and the Company will each own a 50% undivided
ownership interest in MSAT-1,  will be jointly  responsible for the operation of
MSAT-1, and will share certain satellite operating expenses,  but will otherwise
maintain their separate business operations.

The Satellite  Purchase  Agreement and  Satellite  Lease  Agreement are separate
transactions and reflect separate sets of obligations for the Company. While the
Company believes that if ACTEL defaults under the Satellite Lease Agreement, the
Company  would  be able to  achieve  the  return  of  MSAT-2  from  ACTEL to its
operation in the United  States and  terminate  its payment  obligations  to TMI
under the Satellite  Purchase  Agreement,  there can be no assurances  that such
actions  can be  achieved.  In  addition,  there can be no  assurances  that the
agreements  will operate in  parallel,  or that the Company will not be met with
certain  completion or transactional  risks under the Satellite Lease Agreement.
If it is necessary for the Company to make payments under the Satellite Purchase
Agreement at a time when it is not receiving  payments under the Satellite Lease
Agreement, the Company could be materially and adversely affected.

Closing under the Satellite  Purchase Agreement and Satellite Lease Agreement is
subject  to a number  of  conditions,  including:  United  States  and  Canadian
regulatory approvals;  a successful financing by ACTEL of at least $120 million;
completion of certain  satellite  testing,  inversion and relocation  activities
with  respect  to  American  Mobile's  satellite,  to support  the  contemplated
services  over  Africa;  receipt  of  various  government   authorizations  from
Gibraltar, South Africa and other jurisdictions to support satellite relocation,
including authorizations with respect to orbital slot and spectrum coordination;
and completion of certain system  development  activities  sufficient to support
satellite  redeployment.  On March 13, 1998,  the FCC  provided  approval of the
transactions; Canadian government coordination and approvals remain outstanding.
It  is  anticipated   that  the  closing  under  both   agreements   will  occur
simultaneously in the spring of 1998. It is anticipated that the net proceeds of
the Satellite  Lease  Agreement and Satellite  Purchase  Agreement  will be used
primarily  to repay  the  Company's  Revolving  Credit  Facility,  as well as to
provide the Company with additional liquidity.  In addition,  any amounts repaid

                                     - 11 -



from the net proceeds of the Satellite  Lease  Agreement and Satellite  Purchase
Agreement  would  reduce  the  commitment  available  to the  Company  under the
Revolving  Credit  Facility.  See  "Management's   Discussion  and  Analysis  of
Financial   Condition  and  Results  of  Operations  --  Liquidity  and  Capital
Resources."  While it is anticipated that these  transactions  would improve the
leverage of and provide  additional  liquidity to the  Company,  there can be no
assurance that such transactions will be consummated simultaneously, or at all.


                        Satellite Back-up and Technology

The Company  presently has an agreement with TMI, the Canadian mobile  satellite
licensee,  for reciprocal  backup,  restoral and excess  capacity usage ("Backup
Capacity") on the other party's satellite in the event of a satellite failure or
a need for  excess  capacity.  In the event that the lease and  redeployment  of
MSAT-2 is consummated, the Company will no longer have available Backup Capacity
from  MSAT-1.  Each of MSAT-2  and MSAT-1  has in the past  experienced  certain
technological  anomalies,  most  recently with respect to MSAT-2 in January 1998
and MSAT-1 in February 1998.  While recent  anomalies have involved either spare
components  or ones which have not had a material  impact on the Company,  there
can be no assurance that either of the satellites will not experience subsequent
anomalies that could adversely affect the Company's financial condition, results
of operations and cash flows. In the event that MSAT-1 experiences  anomalies of
this type or other  types at a time when the  Company  has no back-up  capacity,
there  would be a material  adverse  effect on the  Company.  See  "Management's
Discussion  and  Analysis of  Financial  Condition  and Results of  Operations -
Liquidity and Capital Resources."

The  Company,  as well as TMI,  has  received  a current  recommendation  from a
subcontractor to its satellite  manufacturer  that, pending further results from
an ongoing  investigation,  the satellite  should be operated at modified  power
management levels. The Company and its satellite  manufacturer are investigating
the basis, if any, for this recommendation.  Based on the information  available
to date,  management  believes  that,  even if  maintained,  the  current  power
management  recommendation  would  not have a  material  negative  effect on the
Company's  business  plan  within  the  next  three  to  five  years,  based  on
anticipated  traffic patterns and anticipated  subscriber  levels.  In the event
that traffic patterns or subscriber levels materially exceed those  anticipated,
the power management recommendation, if maintained, could have a material impact
on the Company's long-term business plan.

MSAT-2 has an expected  remaining service life of approximately  eight years and
the expected  remaining life of MSAT-1 is approximately ten years. This expected
remaining service life of each satellite may be affected by a number of factors.
For example, random failure of satellite components could result in damage to or
loss of MSAT-2 or MSAT-1.  It is also  possible that either  satellite  could be
damaged by  electromagnetic  storms or collisions  with other objects,  although
such occurrences are rare. Although the Company believes that the actual service
lives of both satellites may exceed their expected  service lives,  there can be
no assurance that MSAT-2's or MSAT-1's expected service life will be exceeded or
achieved. Although the Company has obtained in-orbit insurance against a failure
of MSAT-2 in the amount of $184 million,  such  insurance  includes a variety of
deductibles,  performance  margins and  exclusions  and it is unlikely  that any
recovery under such insurance  would fully  compensate the Company for losses it
would sustain in such event.  Further,  the proceeds from the in-orbit insurance


                                     - 12 -




must be used to repay the outstanding  balance of the New Bank Financing and the
remaining  proceeds,  if any,  would be  insufficient  to construct,  launch and
insure the launch of a  replacement  satellite.  There can be no assurance  that
additional  financing  will be  available  to  construct,  launch  and  insure a
replacement satellite or, if available,  will be available on terms favorable to
the  Company.  At present,  there is no  insurance  policy in effect for MSAT-1.
Although there can be no assurance, the Company believes that it will be able to
obtain  insurance with respect to its interest in MSAT-1 in connection  with the
Satellite Purchase Agreement on terms  substantially  similar to those presently
in effect for MSAT-2. In addition,  the in-orbit  insurance policy is subject to
annual renewal,  and there is no assurance that insurance on favorable terms and
at commercially  reasonable  rates will remain available for coverage of MSAT-2,
or be available for coverage of MSAT-1.

In the event that,  following the satellite lease, MSAT-1 ceases to operate, the
Company  would have several  options to replace the lost  capacity,  through the
lease or purchase of capacity on certain Inmarsat satellites, or the launch of a
new  satellite.  However,  each  of  these  options  would  require  substantial
lead-time and  significant  financing.  As a result,  any such delay or need for
significant funds would result in a material adverse effect on the Company.


                                   Competition

The wireless  communications industry is highly competitive and is characterized
by  frequent  technological  innovation.  The  Company  competes on the basis of
providing comprehensive,  end-to-end solutions and a premium level of service in
the markets it serves.  End-to-end  solutions have been assembled working with a
select  group  of  business  partners  who  develop  and  manufacture  software,
middleware  and  hardware  components.  The  Company  differentiates  itself and
provides a premium  level of service due to its unmatched  geographic  coverage,
in-building   penetration,   guaranteed   message   delivery,   and   guaranteed
reliability.

The Company  competes  with a full array of  companies,  from small  startups to
Fortune 500 companies.  Many of these competitors have financial,  technical and
marketing resources in excess of the Company's.  Because the Company competes in
several market segments with a broad range of services,  competing  technologies
may address one or more of the market  segments.  The Company has identified six
major classes of  technologies or services that offer  capabilities  competitive
with  the  Company's  services:   Terrestrial  Packetized  Data;   Cellular/PCS;
Specialized  Mobile Radio  ("SMR")/Enhanced  Specialized  Mobile Radio ("ESMR");
Private Systems; Paging/Narrowband PCS; and Mobile Satellite Services.


                                     - 13 -





Terrestrial  Packetized  Data.  Companies  using  packetized  data  technologies
provide  wireless  data  services  that  compete  directly  with a number of the
Company's data products.  Packetized data technology relies on radio frequencies
to transmit short-burst data messages. Primary competitors using this technology
include  RAM  Mobile  Data  ("RAM"),  Metricom,  Teletrac  and  Cellnet.  RAM, a
wholly-owned  subsidiary of BellSouth  enterprises,  operates a terrestrial-only
network that provides data services to customers primarily in the field service,
transportation  and utility  industries.  The Company  believes that its network
provides broader  coverage,  and superior  in-building  penetration  compared to
RAM's network. In addition, the Company is upgrading its network in major cities
so that it will  operate  at  faster  speeds  than the RAM  network.  Metricom's
Ricochet  service  provides  wireless,  mobile access to the  Internet,  private
intranets, local area networks and e-mail. Metricom currently offers its service
in limited regions comprised of San Francisco,  Seattle, Houston and Washington,
D.C. Teletrac  provides  primarily  location and vehicle  monitoring and two-way
data transfer services in major metropolitan areas and Cellnet provides wireless
meter reading services.

Cellular and PCS. Cellular and PCS services compete with the Company's satellite
and  terrestrial  voice and data services,  and presently  serve the majority of
mobile communications users in the United States, with approximately  55,000,000
units.  Cellular  and PCS systems  operated  by  approximately  1,500  companies
collectively  provide  service  throughout  most of the United  States,  with no
single  competitor  providing the breadth of coverage that is available  through
the Company's  network.  Cellular  Digital  Packet Data  ("CDPD"),  the cellular
industry's   standard   packet  data  service,   is  available   principally  in
metropolitan  areas containing  approximately 44% of the nation's  population at
the end of 1997.  PCS carriers,  many of which offer short message  capabilities
and expect to offer  larger  capacity  packet data  services in the near future,
presently offer service which in the aggregate covers  approximately  60% of the
U.S. population.

Most cellular and PCS providers have structured  their services and distribution
principally to meet switched voice service  requirements of broad-market  users.
However, HighwayMaster Communications, Inc. offers data and voice communications
to the long-haul  trucking  industry  through the application of its proprietary
messaging and billing  technologies to circuit-switched  cellular capacity which
it purchases in bulk from a number of large  cellular  carriers.  Differences in
equipment  and service  pricing and  product  characteristics  result in minimal
direct competition  between the Company's voice products and most other cellular
carriers.

Specialized  Mobile  Radio (SMR) and  Enhanced  Specialized  Mobile Radio (ESMR)
Services.  Within the  limitations  of available  spectrum and  technology,  SMR
operators compete with the Company's voice dispatch services by providing mobile
communications  services,  including  mobile  telephone,  dispatch,  paging  and
limited  data  services.  For  certain  applications,  such as mobile  telephone
interconnect,  SMR  systems  presently  are less  expensive  than the  Company's
services,  although the shared channel  configuration and the economics of these
systems have traditionally caused SMR systems to be less frequently utilized for
voice telephone services.

SMR radio  services  have  been  expanding  rapidly  over the past ten years and
converting  from analog to digital  technology.  ESMR  systems  compete with the
Company's  voice  and data  dispatch  services  in  metropolitan  areas.  NEXTEL


                                     - 14 -




Communications,  Inc.  ("Nextel")  provides  ESMR  services  in  numerous  large
metropolitan  service areas in the United States and is the leading  provider of
SMR using digital  technology,  frequency reuse and lower power  transmitters to
transform its current SMR service into cellular-like  services,  including voice
telephone services. Geotek Communications, Inc. ("Geotek") offers voice and data
communication  networks for the trunked mobile radio market.  Targeted primarily
to small and  medium-sized  businesses  managing  fleets of vehicles  and mobile
workforces,  Geotek is focused  on  providing  metropolitan  area voice and data
services. Currently, Geotek's service is available in 11 markets. Neither Nextel
nor Geotek  provide  nationwide  voice  dispatch or data services  comparable to
those offered by the Company.

Private  Land  Mobile  Frequencies.  Individual  companies  that have  chosen to
develop their own private wireless data network constitute a large percentage of
the wireless  marketplace for corporate fleets. An example of such a customer is
Federal Express. While these companies already have made significant investments
in their systems,  in some cases  recurring  maintenance,  upgrade and expansion
costs,  coupled with recent steps by the FCC to charge private system owners for
the use of the radio  frequencies,  have caused these  organizations  to turn to
commercial providers such as the Company.

Narrowband  PCS/Enhanced  Paging.  There are a large number of paging  companies
that offer messaging services on a regional or nationwide basis. Despite the low
cost  of  one-way  paging,  most  traditional  paging  services  do not  provide
full-function two-way  communications.  Although some paging companies,  such as
MTel,  have begun to offer  limited  time-delayed  two-way  messaging  services,
initial challenges in coverage,  responsiveness  and throughput  currently limit
their adoption by the Company's targeted business customers.

Mobile  Satellite   Services.   The  Company's  voice  and  data  services  face
competition  from a number  of  companies  that are  selling  or are  developing
services using a variety of satellite  technologies.  The principal  alternative
satellite-based  communications  system  available  to the  trucking  market  is
Qualcomm Incorporated's ("Qualcomm") OmniTracs nationwide data service. Qualcomm
currently  provides  low-speed  mobile data services using  terminals  which are
priced  competitively with the Company's  satellite-only  terminals.  Qualcomm's
OmniTracs  service  does  not  provide  a  terrestrial  communications  path  or
least-cost routing  capabilities similar to the Company's multi-mode product. As
a result,  transmissions to and from a vehicle must be routed exclusively over a
satellite  network  and are  subject  to  line  of  sight  blocking  and  higher
transmission costs, limiting the product's  functionality and cost-effectiveness
in segments that require urban coverage or large volumes of data transmission.

NORCOM Networks Inc.  ("NORCOM") is in the process of  commercially  deploying a
satellite-based  packet data  service  that  competes  with the  Company's  data
services in the  transportation  and field service  segments.  NORCOM  currently
purchases channel capacity on the Company's satellite over which it operates its
network,  and  combines its  satellite  data  service  product with  terrestrial
services provided by RAM and by the Company.

The Company's  satellite  services also compete for mobile maritime  subscribers
with TMI, a Canadian  company  operating a satellite  comparable to MSAT-2,  and
with Inmarsat, a consortium of 70 countries

                                     - 15 -





that is authorized to provide  maritime  voice and data services along the North
American  coasts.  Because  Inmarsat's  current system  operates at a much lower
power level than does the  Company's  satellite,  its mobile  terminals  must be
equipped  with  antenna  systems that are larger and more  expensive  than those
required for the  Company's  network.  The  Inmarsat  system also has per minute
charges significantly higher than those charged by the Company. Comsat, the U.S.
signatory  for  Inmarsat,  applied to the FCC for  authority  to provide  mobile
satellite  services  ("MSS") in the United States through  Inmarsat  facilities.
TMI, which is technically capable of providing service within the United States,
has also  announced  its  intention  to provide MSS to domestic  customers  over
MSAT-1.  Although the FCC has  consistently  denied Comsat's  application,  most
recently on January 9, 1998, there can be no assurances that Comsat, TMI, or any
other  satellite  provider,  will not become  authorized  to provide  MSS in the
United States (See "Regulation").

Recently,  several  Low Earth  Orbit  ("LEO")  and Medium  Earth  Orbit  ("MEO")
satellite systems have been announced or have commenced deployment.  Examples of
these   systems,   which  are  more  complex  and  costly  than  the   Company's
geosynchronous network, include Iridium LLC; Globalstar Telecommunications, LTD,
and ICO Global. When deployed,  these systems will offer certain advantages over
the Company's  voice telephony  service,  including the ability to support small
handheld  telephones  and, in certain  instances,  reduced  transmission  delay.
However,  the  Company  does not  expect  that  these  systems  will  provide  a
nationwide  dispatch  service  or support  data  service in excess of 2,400 bps.
Moreover,  these companies are focused primarily on consumer-oriented and global
traveler  applications  and not the business  markets which are the focus of the
Company.  Further,  because these companies will deploy satellite systems,  they
are not expected to compete against urban  in-building data services provided by
the Company.

In addition to relatively  complex LEO systems  designed to provide mobile voice
services,  there are a number of proposals for  relatively  simple  "little" LEO
systems that would provide only low-speed  packet data services.  These systems,
including  ORBCOMM Global,  L.P., Final Analysis and LEO One USA, have access to
comparatively  limited  spectrum and are expected to compete for  customers  who
require  specialty  applications  such as asset tracking  services for unpowered
trailers.


                                   Regulation

American Mobile's satellite system and ARDIS' ground-based two-way wireless data
system are regulated to varying degrees at the federal, state, and local levels.
Various  legislative and regulatory  proposals under  consideration from time to
time by Congress and the FCC have in the past materially affected and may in the
future  materially  affect  the  telecommunications  industry  in  general,  and
American Mobile and ARDIS in particular. In addition, many aspects of regulation
at the federal,  state and local level  currently are subject to judicial review
or are the subject of administrative or legislative proposals to modify, repeal,
or adopt new laws and administrative  regulations and policies. The following is
a summary of significant laws,  regulations and policies affecting the operation
of American Mobile's and ARDIS' businesses.



                                     - 16 -





General

The ownership and operation of American Mobile's system and ARDIS'  ground-based
two-way  wireless  data system are subject to the rules and  regulations  of the
FCC, which acts under authority  granted by the  Communications  Act and related
federal  laws.  Among  other  things,  the FCC  allocates  portions of the radio
frequency  spectrum to certain  services  and grants  licenses to and  regulates
individual  entities  using that  spectrum.  American  Mobile and ARDIS  operate
pursuant to various licenses granted by the FCC.

Both American  Mobile and ARDIS are  Commercial  Mobile Radio  Service  ("CMRS")
providers and therefore are  regulated as common  carriers.  The companies  must
offer service at just and reasonable rates on a first-come,  first-serve  basis,
without any unjust or unreasonable  discrimination,  and they are subject to the
FCC's complaint  processes.  The FCC has forborne from applying  numerous common
carrier provisions of the  Communications Act to CMRS providers.  In particular,
American  Mobile  and  ARDIS  are not  subject  to  traditional  public  utility
rate-of-return  regulation,  and the  companies are not required to file tariffs
with the FCC for their domestic services.

As providers of  interstate  telecommunications  services,  American  Mobile and
ARDIS are required to contribute  to the FCC's  universal  service  fund,  which
supports the provision of  telecommunications  services to high-cost  areas, and
establishes  funding  mechanisms to support the provision of service to schools,
libraries,  and rural  health care  providers.  Under the FCC's  current  rules,
American  Mobile and ARDIS are  required to  contribute  a  percentage  of their
end-user    telecommunications    revenues    resulting   from   the   sale   of
telecommunications services. The extent of this obligation is subject to change.
A number of parties  have  filed  petitions  for  review of the FCC's  universal
service  policy and these appeals have been  consolidated  in the U.S.  Court of
Appeals for the Fifth Circuit. Both companies may also be required to contribute
to state universal service programs. The requirement to make these payments, the
amount  of  which  in  some  cases  may be  subject  to  change  and is not  yet
determined,  may  have a  material  adverse  impact  on  the  conduct  of  their
businesses.

American Mobile and ARDIS are subject to the  Communications  Assistance for Law
Enforcement  Act ("CALEA").  Under CALEA,  American Mobile and ARDIS must ensure
that law enforcement agencies can intercept certain  communications  transmitted
over  their  networks.  American  Mobile  and ARDIS  must also  ensure  that law
enforcement  agencies are able to access  certain  call-identifying  information
relating to communications  over their networks.  The companies must comply with
the CALEA  requirements  and any rules  subsequently  promulgated by October 25,
1998 or face  possible  sanctions,  including  substantial  fines  and  possible
imprisonment of company officials.  The FCC currently has a proceeding  underway
to establish rules for the implementation of these requirements. This proceeding
primarily   addresses    record-keeping   and   security-related   issues.   The
telecommunications  industry,  which has been charged with establishing detailed
technical standards for compliance with CALEA's  requirements,  has not yet been
able to adopt final standards that are acceptable to law enforcement. While both
Congress and the FCC have the authority to extend the compliance deadline,  both
have thus far declined to do so. It is not clear whether the  companies  will be
able to comply with  CALEA's  requirements  or will be able to do so in a timely
manner.  CALEA  establishes  a  federal  fund to  compensate  telecommunications


                                     - 17 -




carriers  for  all  reasonable  costs  directly  associated  with  modifications
performed by carriers in connection  with  equipment,  facilities,  and services
installed or deployed on or before January 1, 1995.  For equipment,  facilities,
and  services  deployed  after  January 1, 1995,  the CALEA fund is  supposed to
compensate  carriers for any  reasonable  costs  associated  with  modifications
required to make  compliance  "reasonably  achievable."  It is possible that all
necessary  modifications  will not  qualify for this  compensation  and that the
available  funds  will  not  be  sufficient  to  reimburse  the  companies.  The
requirement  to comply  with CALEA could have a material  adverse  effect on the
conduct of their businesses.

As a matter of general  regulation by the FCC, both of the companies are subject
to, among other things, payment of regulatory fees, restrictions on the level of
radio frequency  emissions of their systems' mobile terminals and base stations,
and "rate  integration"  regulations  requiring  that  providers  of  interstate
interexchange  telecommunications  services  charge  the same  rates  for  these
services in every state,  including Puerto Rico and the U.S. Virgin Islands. Any
of  these  regulations  may  have an  adverse  impact  on the  conduct  of their
businesses.

The FCC licenses of American Mobile and ARDIS are subject to restrictions in the
Communications  Act  that  (i)  certain  FCC  licenses  may  not  be  held  by a
corporation  of which more than 20% of its capital  stock is  directly  owned of
record or voted by non-U.S.  citizens or entities or their  representatives  and
(ii) that no such FCC license may be held by a corporation controlled by another
corporation   ("indirect  ownership")  if  more  than  25%  of  the  controlling
corporation's capital stock is owned of record or voted by non-U.S.  citizens or
entities or their representatives,  if the FCC finds that the public interest is
served  by the  refusal  or  revocation  of  such  license.  However,  with  the
implementation of the Basic  Telecommunications  Agreement  ("BTA"),  negotiated
under the  auspices  of the World  Trade  Organization  ("WTO") and to which the
United States is a party, the FCC will presume that indirect ownership interests
in excess of 25% by non-U.S.  citizens or entities  will be  permissible  to the
extent that the ownership interests are from WTO-member countries.  The BTA took
effect on February 5, 1998, and the FCC's  implementing  regulations took effect
on February 9, 1998.


American Mobile

American Mobile is licensed by the FCC to provide a broad range of mobile voice,
data and dispatch services via satellite to land, air and sea-based customers in
a service area  consisting of the  continental  United States,  Alaska,  Hawaii,
Puerto Rico,  the U.S.  Virgin  Islands and U.S.  coastal  waters and  airspace.
American Mobile is also authorized to provide fixed site voice and data services
via  satellite to locations  within this service  area, so long as such services
remain incidental to American Mobile's mobile communications services.  American
Mobile  is  authorized  to  build,  launch  and  operate  three   geosynchronous
satellites in accordance  with a specified  schedule.  American Mobile is not in
compliance with the schedule for commencement and construction of its second and
third satellites and has petitioned the FCC for changes to the schedule. Certain
of these extension requests have been opposed by third parties.  The FCC has not
acted on American  Mobile's  requests.  The FCC has the  authority to revoke the
authorizations  for the second and third satellites and, in connection with such


                                     - 18 -




a revocation, could exercise its authority to rescind American Mobile's license.
American  Mobile  believes  that the  exercise of such  authority to rescind the
license is unlikely. The term of the license for each of American Mobile's three
authorized  satellites is ten years,  beginning when American  Mobile  certifies
that the respective  satellite is operating in compliance with American Mobile's
license.  The ten-year term of MSAT-2 began August 21, 1995.  Although  American
Mobile  anticipates  that the  authorizations  are likely to be  extended in due
course to correspond to the useful lives of the satellites and that new licenses
will be  granted  for  replacement  satellites,  there is no  assurance  of such
extension or grant.

American  Mobile's  current  foreign  ownership  level,  for which the  indirect
ownership limits are applicable,  is approximately 21%. Singapore,  which is the
domicile of Singapore Telecom, one of American Mobile's largest shareholders, is
a WTO-member country.

On March 12, 1998, the FCC granted American Mobile's application  requesting the
modification of its license to permit American Mobile to implement the Satellite
Purchase Agreement and Satellite Lease Agreement. This proceeding was contested,
and the  opponents  to this  application  may  seek  review  of this  grant.  In
addition,  this  grant  is  conditioned  upon and  subject  to  modification  as
necessary to comply with any subsequent agreement between representatives of the
governments of Canada and the United States concerning shared use of MSAT-1.

MSAT-2,   like   MSAT-1,   is   designed   to  be  able  to  operate   over  the
1530-1559/1631.5-1660.5  MHz bands (the "L-band").  American Mobile is currently
licensed to operate in the 1544-1559/1645-1660.5 MHz bands (the "upper L-band").
The  FCC has  designated  American  Mobile  as the  licensee  for  both  MSS and
Aeronautical  Mobile  Satellite  (Route) Service  ("AMS(R)S").  AMS(R)S includes
satellite communications related to air traffic control, as well as aeronautical
safety-related  operational and administrative  functions. As a condition to its
authorization, American Mobile is required by the FCC to be capable of providing
priority and preemptive access for AMS(R)S traffic in the upper L-band and to be
interoperable with and capable of transferring  AMS(R)S traffic to international
and  foreign  systems   providing  such  service.   American  Mobile   currently
anticipates  it will be able to meet these  requirements  without  any  material
adverse  effect on its  business.  If  American  Mobile is unable to meet  these
requirements,  the FCC may authorize and give priority spectrum access to one or
more additional satellite systems that meet the specified requirements.

American  Mobile has  applied  for  authorization  to operate in the  additional
1530-1544/1631.5-1645.5  MHz bands (the "lower  L-band").  If American Mobile is
assigned spectrum in the lower L-band, it will be required by the FCC to provide
similar priority and preemptive access in that spectrum to maritime distress and
safety  communications.  With  respect to its mobile voice  terminals,  American
Mobile currently  anticipates it will be able to meet this  requirement  without
any material adverse effect on its business. The Federal Aviation Administration
("FAA")  filed  comments,   however,   in  connection  with  American   Mobile's
application to operate up to 30,000 mobile data terminals that were transitioned
from leased space  segment to MSAT-2 in late 1995,  stating its concern that the
mobile data terminals  cannot be operated in compliance  with American  Mobile's
obligation to provide  priority and preemptive  access in the upper L-band.  The
FAA has proposed that American  Mobile  operate the mobile data terminals in the
lower  L-band.  American  Mobile has  received  successive  six-month  grants of
special temporary authority ("STA"),  under a two-year waiver of the FCC's rules
on priority and preemptive access, to operate up to 15,100 mobile data terminals
in the lower L-band.  This number was increased to 33,100 terminals  pursuant to
American  Mobile's  acquisition  of  the  mobile  data  equipment  and  services
previously licensed to Rockwell.  The two-year waiver expired on August 1, 1997,
but remains in effect while American  Mobile's request for a two-year  extension
of that  waiver is  pending at the FCC.  American  Mobile  will need  additional
authority to increase the number of mobile data  terminals that it is authorized
to operate if it is to fulfill contracts with GE Logisticom and others. American
Mobile will also need  permission  from the FCC to operate mobile data terminals
with a different transmission design than those operated under its current lower
L-band  authorization.  Transmissions  from these terminals require a wider band
width than do transmissions from American Mobile's existing terminals. There can
be no  assurance  that  American  Mobile will  continue to receive  authority to
operate  these new mobile data  terminals  or any other  additional  mobile data
terminals in the lower L-band.

American Mobile's mobile terminal  authorizations are subject to compliance with
certain requirements regarding interference protection to the Global Positioning
System ("GPS").  With the consent of the FAA, the FCC granted American  Mobile's
application  subject  to  certain  conditions,  including  that the grant may be
modified after the interference  issue is studied.  The FCC is now considering a
proposal from the National  Telecommunications and Information Administration to
impose more stringent  limits on the  out-of-band  emissions from certain mobile
terminals,  including those used in connection with American Mobile's system, in
order  to  protect  GPS and  the  Russian  Global  Navigation  Satellite  System
("Glonass").  This proposal would require that mobile terminals used on American
Mobile's  system be  manufactured  according  to a new design by 2002,  and that
existing  terminals  and any  terminals  not meeting the new  specifications  be
retired or retrofitted by 2005.  American  Mobile has opposed this proposal.  If
adopted by the FCC, this policy could have a material adverse effect on American
Mobile's business.

American Mobile's license  authorizes MSAT-2 to operate using certain telemetry,
transfer  and control  frequencies  in the  Ku-band,  and,  under the  Satellite
Purchase   Agreement,   American  Mobile  would  operate  MSAT-1  using  similar
frequencies.  American Mobile  operates  MSAT-2 at the 101 degrees W.L.  orbital
location, and, under the Satellite Purchase Agreement, would also operate MSAT-1
at 101 degrees  W.L. GE American  Communications,  Inc.  ("GE  American"),  also
operates a satellite at the 101 degrees W.L. orbital  location.  American Mobile
and GE  American  have an  agreement  covering  both  MSAT-1 and MSAT-2 that may
require  American Mobile to modify its operations or make certain payments to GE
American if  American  Mobile's  operations  cause  interference  to those of GE
American. While there can be no assurances,  the Company does not anticipate any
interference  in the  operations  of either  MSAT-1  or  MSAT-2  and those of GE
American.

American Mobile's  subscriber  equipment will operate in L-band frequencies that
are limited in  available  bandwidth.  The  feeder-link  earth  stations and the
network communications controller of the CGS operate in the more plentiful fixed
satellite  service  Ku-band  frequencies.  Of the 30  MHz  in the  upper  L-band
frequencies,   American   Mobile  is  currently   licensed  to  operate  in  the
1544-1559/1645.5-1660.5  MHz bands. Of the 30 MHz assigned to American Mobile by


                                     - 19 -




the FCC,  one MHz is  limited  to  AMS(R)S  and  one-way  paging and two MHz are
limited to distress and safety communications.  American Mobile does not plan to
operate on these three MHz of bandwidth.

In June 1996, the FCC issued a notice of proposed rulemaking proposing to assign
to  American  Mobile  the  first 28 MHz of  internationally  coordinated  L-band
spectrum  from either the upper or lower  portion of the MSS  L-band.  Under the
FCC's  proposal,  American  Mobile would have first  priority  access to use the
lower L-band  spectrum as necessary to compensate for spectrum  unavailable  for
coordination  in the upper  L-band.  In the event the  United  States is able to
coordinate more than 28 MHz of L-band  spectrum,  the FCC has proposed  allowing
other applicants to apply for assignment of those frequencies.  Certain entities
have filed with the FCC  petitions to deny  American  Mobile's  application  and
comments  opposing the assignment of additional  frequencies to American Mobile.
While there can be no assurances,  American Mobile believes the FCC is likely to
grant American Mobile's application.

In the Ku-band  frequencies,  American  Mobile is currently  licensed to operate
MSAT-2 using 200 MHz within the bands 10.75-10.95 GHz for downlink transmissions
and 13.0-13.15 GHz and 13.2-13.25 GHz for uplink transmissions.  American Mobile
has applied for  authority to operate  using an  additional  200 MHz of spectrum
within the same bands.

Spectrum availability, particularly in the L-band, is a function not only of how
much spectrum is assigned to American  Mobile by the FCC, but also the extent to
which the same  frequencies  are used by other  systems  in the  North  American
region,  and the manner of such use. All spectrum use must be  coordinated  with
other  parties  that are  providing  or plan to provide  mobile  satellite-based
communications in the same geographical region using the same spectrum.  At this
time,  the other  parties with which  spectrum use must be  coordinated  include
Canada, Mexico, the Russian Federation and Inmarsat.

Use of the spectrum is determined  through a series of negotiations  between the
United States government and the other user agencies,  pursuant to the rules and
regulations of the International  Telecommunication  Union ("ITU"). For the past
several years, each of the countries and international  organizations  that have
used or will use L-band  frequencies  within the North American region have been
meeting  regularly to negotiate and  coordinate  their current and future use of
that spectrum.  American Mobile estimates that  international  coordination will
make  approximately 20 MHz of L-band spectrum available to the United States for
MSAT-2.  Since the  coordination  process  involves  many  parties  and there is
uncertainty about the total outcome, the actual amount of spectrum available may
be more or less than that estimated. In addition, the proposed Satellite Sharing
Agreement may make the  coordination  of spectrum for American  Mobile's  system
more  difficult.  Some of the spectrum that may be available to American  Mobile
may  include  a portion  of the 28 MHz lower  L-band  spectrum  adjacent  to the
frequencies already assigned to American Mobile by the FCC.

The ITU's  Radio  Regulations  include  a table of  frequency  allocations  that
prescribe  the  permitted  uses of the  radio  spectrum.  As a result of the ITU
satellite  plan for parts of the  Ku-band,  there  also may be  restrictions  on
American Mobile's ability to deploy feederlink earth stations in Alaska, Hawaii,
Puerto Rico, and the U.S. Virgin Islands.

                                     - 20 -





During the course of the licensing process for American Mobile and several times
since,  the FCC has stated that there is only enough  spectrum in the MSS L-band
for the FCC to  authorize  a single MSS system to provide  service in the United
States.  In 1995,  however,  Comsat  applied for authority to provide MSS in the
United  States  in  the  L-band  over  the  Inmarsat  satellite  system.  Comsat
subsequently  filed an  application  seeking  a  blanket  authorization  for the
operation of 5,000 mobile  terminals in the United States,  as well as a request
for an STA to operate 50 mobile  terminals in the United  States.  On January 9,
1998, the FCC denied Comsat's  request for an STA and required that Comsat amend
its underlying applications to conform with the requirements  established in the
FCC's  November  1997  order on  market  access  by  foreign-licensed  satellite
systems.  This order  conforms the FCC's  regulations  with the BTA and makes it
easier for foreign  satellite  systems from  WTO-member  countries to access the
United States market,  while at the same time making clear that the FCC may deny
access  to such  satellite  applicants  on the basis of  spectrum  availability,
applicants'  technical,  legal,  or  financial  qualifications,  or  foreign  or
domestic policy  factors.  The order also requires Comsat to make an appropriate
waiver of immunity from any suit as part of any application to provide  domestic
services over Inmarsat's  system. On January 12, 1998, Comsat filed an appeal of
this order with the U.S.  Court of Appeals for the D.C.  Circuit,  and  American
Mobile is opposing  this appeal as an  intervenor.  On February 6, 1998,  Comsat
filed an  application  for review of the FCC's denial of its request for an STA,
and a petition  for waiver of the FCC's new market  access rules to permit it to
offer MSS on a temporary basis in the United States. American Mobile has opposed
these filings.

In its January 9, 1998 denial of Comsat's  STA  request,  the FCC stated that it
would be willing to authorize Comsat to provide  international service if Comsat
amended  its  blanket  license  application  to show that  service  through  its
terminals and Inmarsat's MSS system could be limited to  international  traffic.
Comsat has  amended  its  application  in order to make this  showing.  American
Mobile has  opposed  this  application.  In  addition,  Comsat has  applied  for
authority  under  Section  214 of the  Communications  Act to provide  satellite
paging and  tracking  services in the United  States.  American  Mobile has also
opposed this application.

TMI, which is technically capable of providing service within the United States,
has also  announced  its  intentions to provide MSS to domestic  customers  over
MSAT-1.  On  February  10,  1998,  the FCC  granted a  thirty-day  STA to SatCom
Systems,  Inc. for the testing of up to 30 mobile terminals in the United States
using TMI's system.  On March 10, 1998, SatCom filed a request for an additional
STA of 90 days for further  testing,  and also  requested that the scope of this
STA be expanded to permit it to operate up to 500 mobile  terminals for 180 days
on a private  carrier  so that it may  conduct  U.S.  marketing  trials.  SatCom
simultaneously  filed an  application  for a blanket  license  to  operate up to
25,000 mobile  terminals in the United States over MSAT-1 on a permanent  basis.
American Mobile will oppose  SatCom's  request for an expanded STA to operate up
to 500 mobile  terminals  for 180 days and SatCom's  application  for  permanent
authority to operate mobile terminals in the United States.

On January 30, 1998, Kitcomm Satellite  Communications Ltd.  ("Kitcomm") filed a
letter of intent with the FCC to provide MSS to U.S. customers over its proposed
foreign-licensed  satellite  system.  Kitcomm proposes to provide two-way remote
data  collection,  tracing,  and messaging  services over a global system in the

                                     - 21 -



lower L-band at 1525-1530/1626.5-1631 MHz. In order to provide domestic service,
Kitcomm will also have to request  authority to operate mobile  terminals in the
United States.  American  Mobile will oppose any FCC application by Kitcomm that
would reduce the spectrum  available to American  Mobile either directly or as a
result of international frequency coordination.

In addition to providing  additional  competition to American Mobile, a grant of
domestic   authority  by  the  FCC  to  one  of  these  foreign   systems  would
significantly increase the demand for spectrum in the international coordination
process and could adversely affect American Mobile's business.

American  Mobile is operating  under waivers of certain FCC rules.  In 1996, the
FCC  issued an order  requiring  all CMRS  providers  to offer what are known as
"enhanced  9-1-1  services"  including the ability to  automatically  locate the
position of all transmitting  mobile  terminals.  American Mobile would not have
been  able  to  offer  this  automatic  location   information   without  adding
substantially  to the cost of its mobile  equipment  and  reconfiguring  its CGS
software.  The FCC  decided  not to  impose  specific  new  requirements  on MSS
providers,  including  American  Mobile,  at that  time.  The FCC did  state its
expectation  that  such  providers  eventually  would  be  required  to  provide
"appropriate   access  to  emergency   services."  A  decision  to  impose  this
requirement  on MSS providers  could have a material  adverse effect on American
Mobile.

The FCC enacted  "rate  integration"  regulations  requiring  that  providers of
interstate interexchange  telecommunications  services charge the same rates for
these  services  in every  state,  including  Puerto  Rico  and the U.S.  Virgin
Islands.  American  Mobile has opposed the  imposition of this rate  integration
requirement on its MSS system, so that it may preserve the flexibility to charge
more for service in areas covered by satellite beams that require more satellite
power. The FCC has denied American  Mobile's  request for a permanent  exemption
from  its  rate  integration  requirement,  but has not yet  ruled  on  American
Mobile's  request for a temporary  waiver of a year or more. The FCC has granted
American Mobile an interim waiver from its rate  integration  requirement  until
its decision on American Mobile's temporary waiver request.


ARDIS

ARDIS' wireless data network consists of base stations  licensed in the Business
Radio  and  Specialized  Mobile  Radio  Service,  all  operating  in the 800 MHz
frequency  band.  The ARDIS system is  interconnected  with the public  switched
network.

The FCC's licensing regime in effect when it issued ARDIS' licenses provided for
the issuance of  individual  licenses for specific  channels at specific  sites.
With  respect  to the part of the  band in which  all of  ARDIS'  base  stations
operate,  however,  the FCC has  implemented  a new  licensing  regime.  The new
licensing  regime involves the auctioning of licenses for specific  channels for
wide  geographic  areas,   within  which  the  licensee  will  have  substantial
flexibility to operate any number of base stations, including base stations that
may operate on the same channels as incumbent  licensees such as ARDIS.  The FCC
has proposed to conduct the auctions for additional channel capacity of the kind


                                     - 22 -




used by ARDIS  beginning  in the third  quarter  of 1998.  The FCC  proposes  to
prohibit the new geographic  licensees from causing  interference to incumbents,
but there is  concern  that  such  interference  may  occur  and that  practical
application of these rules is uncertain.

ARDIS believes that it has licenses for sufficient  channels to meet its current
needs for capacity.  To the extent that it needs additional capacity,  it may be
required to either participate in the upcoming auctions or acquire channels from
other  licensees.  As part of its  new  licensing  regime,  the  FCC  permits  a
wide-area geographic licensee, with prior FCC approval, to sell a portion of its
geographic  area to another  entity.  This  partitioning  authority may increase
ARDIS'  flexibility  to operate  additional  base  stations,  but the  practical
utility of this option is uncertain at this time.

ARDIS  operates  its system  under a number of  waivers  of the FCC's  technical
rules,  including  rules on  station  identification,  for-profit  use of excess
capacity,  system  loading,  and multiple  station  ownership.  Several of these
waivers were first  obtained  individually  by IBM and Motorola,  which operated
separate  wireless  data systems  until forming the ARDIS joint venture in 1990.
The FCC  incorporated  a number of these  waivers into its  regulations  when it
implemented Congress' statutory provision creating the CMRS classification,  and
ARDIS no longer  requires  those  waivers.  On June 5, 1996,  the FCC waived its
one-year  construction  requirement  and  granted  ARDIS  extensions  of time to
complete  the  buildouts  of  approximately  190 sites,  as required to maintain
previously granted licenses.  As of March 25, 1998, ARDIS intends but has yet to
construct 104 of these sites. The extended  construction  deadlines vary by site
between June 27, 1998 and March 31, 1999. Failure to complete the buildouts in a
timely manner could result in a loss of licenses for such sites from the FCC. In
addition, at 11 of 104 uncompleted sites ARDIS is required to erect a new tower,
and there is no  assurance  that local  zoning  regulations  will not affect the
timetable for the completion of these sites.

The  foregoing  does not purport to describe all present and  proposed  federal,
state, and local regulation and legislation  relating to the industries in which
American  Mobile and ARDIS operate.  Other existing  federal,  state,  and local
regulations  currently  are the  subject of a variety of  judicial  proceedings,
legislative  hearings,  and administrative and legislative  proposal which could
change,  in  varying  degrees,  the  manner in which  American  Mobile and ARDIS
operate.  Neither the outcome of these  proceedings nor their impact on American
Mobile's and ARDIS' operations can be predicted at this time.


ARDIS Acquisition

On March 3, 1998,  the FCC granted  authority for the transfer of control of all
authorizations  held by ARDIS  to the  Company,  thereby  permitting  ARDIS  and
American  Mobile to consummate the  Acquisition.  Interested  parties have until
April 2, 1998 to appeal or ask for  reconsideration  of this grant,  and the FCC
has until April 13, 1998 to  reconsider  this grant on its own motion.  If these
dates are reached  without any challenge or FCC  reconsideration  of this grant,
this grant will become  final and not  subject to appeal.  In the event that the
FCC  takes  action  that  prevents  American  Mobile  from  operating  ARDIS  as
contemplated,  American  Mobile has the right to  rescind  the  Acquisition  (an


                                     - 23 -




"Unwind") by providing  notice to Motorola within 30 days of the receipt of such
adverse order.  In the event of an Unwind,  the Purchase Price would be returned
to American Mobile and American Mobile's  ownership  interests in ARDIS would be
returned to  Motorola.  While the Company  does not believe  that such an Unwind
will  occur,  were it to occur,  such an Unwind  would have a  material  adverse
effect on the Company.


                              Year 2000 Compliance

The Company has  implemented  a Year 2000  program to ensure that the  Company's
computer systems, applications,  subscriber units, communications processors and
back office support systems will function  properly beyond 1998. The Company has
assessed how it may be impacted by Year 2000 and has  formulated  and  commenced
implementation of a comprehensive plan to address known issues as they relate to
its information systems.  Vendors that provide critical products and services to
the Company are included in this  assessment  plan.  The plan,  as it relates to
information  systems,  includes  a  combination  of  modification,  upgrade  and
replacement.


If necessary  modifications  and conversions by the Company and those with which
it  conducts  business  are  not  completed  in  a  timely  manner,   Year  2000
non-compliance  may have a material adverse effect on the Company's  operations.
While there can be no  assurances,  the Company  estimates that the cost of Year
2000  compliance  for its  information  system will not have a material  adverse
effect on the future consolidated  results of the operations of the Company. The
Company  is not yet able to  estimate  the  cost of Year  2000  compliance  with
respect  to third  party  suppliers;  however,  based on a  preliminary  review,
management  does not expect that such costs will have a material  adverse effect
on the Company's financial condition, results of operations and cash flow.


                                    Employees

At March 31, 1998,  the Company had  approximately  477  employees.  None of the
Company's  employees is represented by a labor union. The Company  considers its
relations with its employees to be good.

                                     - 24 -





Item 2.  Properties.

The Company leases  approximately  94,000 square feet at its headquarters office
space and network  operations center in Reston,  Virginia.  The lease has a term
which runs  through  August 3, 2003  (which  may be  extended  at the  Company's
election for an  additional  five  years).  In  addition,  the Company  leases a
back-up Ku-band radio frequency  facility in Alexandria,  Virginia.  The Company
also leases  approximately  86,000 square feet of space for an operations center
in  Lincolnshire,  Illinois,  the lease for which expires December 31, 2000, and
approximately 7,800 square feet for a remote data center in Lexington, Kentucky,
the lease for which expires  April 30, 2001.  The Company also leases site space
for approximately 1,700 base stations across the country under one- to five-year
lease contracts with renewal provisions. The Company anticipates that it will be
able to  gain  access  to  additional  base  station  sites  when  necessary  on
acceptable terms.


Item 3.  Legal Proceedings.

In 1992, a former director of American Mobile filed an Amended Complaint against
American Mobile alleging violations of the Communications Act and of the Sherman
Act and  breach  of  contract.  The suit  seeks  damages  for not less than $100
million  trebled  under the  antitrust  laws plus  punitive  damages,  interest,
attorneys'  fees and costs.  In  mid-1992,  American  Mobile  filed its response
denying all allegations. American Mobile's motion for summary judgment, filed on
June 30,  1994,  was  denied  on  April  18,  1996.  The  trial in this  matter,
previously  set for December 1997, has been postponed to a date to be determined
in 1998.  Management  believes  that the  complaint  is without  merit,  and the
ultimate outcome of this matter will not be material to the Company's  financial
position, results of operations, or its cash flow.


Item 4.  Submission of Matters to a Vote of Security Holders.

No matters were  submitted to a vote of the  Company's  Stockholders  during the
fourth quarter of fiscal 1997.




                                     - 25 -







                                     PART II

Items 5, 6, 7 and 8.

The  information  called for by Items 5 through 8 of Part II is  presented  in a
separate  section  of this  Annual  Report on Form 10-K  commencing  on the page
numbers specified below:

Form 10-K Item                                                        Page

Item 5 - Market for the Registrant's 
          Common Equity and Related Matters                           F-49

Item 6 - Selected Financial Data                                      F-50

Item 7- Management's Discussion and Analysis 
         of Financial Condition and Results of Operations             F-1

Item 8 - Financial Statements and Supplementary Data                  F-15



Item 9.  Changes in and Disagreements with Accountants on Accounting and
         Financial Disclosure.

None.




                                     - 26 -





                                    PART III


Items 10, 11, 12 and 13.

The information called for by Part III (Items 10, 11, 12 and 13) is incorporated
herein by reference from the material  included  under the captions  "Nominees,"
"Executive Officers," "Executive  Compensation,"  "Security Ownership of Certain
Beneficial   Owners   and   Management,"    "Agreements   Among   Stockholders,"
"Compensation and Stock Option Committee  Interlocks and Insider  Participation"
and "Section 16(a) Beneficial  Ownership Reporting  Compliance" in the Company's
definitive  proxy statement (to be filed) for its Annual Meeting of Stockholders
to be held May 20, 1998 (the "Proxy  Statement").  The Proxy  Statement is being
prepared and will be filed with the Securities and Exchange  Commission pursuant
to  Regulation  14A on or about April 10, 1998,  and  furnished to the Company's
Stockholders, on or about April 25, 1998.




                                     - 27 -







                                     PART IV

Item 14.  Exhibits, Financial Statement Schedules, and Reports on Form 8-K.


(a)  1.  Financial Statements.

The  following   consolidated  financial  statements  of  the  Company  and  its
subsidiaries  are included in a separate  section of this Annual  Report on Form
10-K commencing on the page numbers specified below:


INDEX

Management's Discussion and Analysis of Financial Condition
          and Results of Operations.......................................F - 1

Report of Independent Public Accountants..................................F - 15

Consolidated Statements of Loss...........................................F - 16

Consolidated Balance Sheets...............................................F - 17

Consolidated Statements of Stockholders' Equity...........................F - 18

Consolidated Statements of Cash Flows.....................................F - 19

Notes to Consolidated Financial Statements................................F - 20

Quarterly Financial Data..................................................F - 49

Selected Financial Data...................................................F - 50




                                     - 28 -





         2.  Financial Statement Schedules.

Financial  Statement  Schedules not included with the one listed below have been
omitted because they are not required or not applicable, or because the required
information is shown in the financial statements or notes thereto.

         I.   Condensed Financial
              Information of Registrant.................................Page S-1




         2.   Exhibits

         3.1     -  Restated  Certificate of  Incorporation of AMSC (as restated
                    effective May 1, 1996) (Incorporated by reference to Exhibit
                    3.1a to the  Company's  Quarterly  Report on Form 10-Q filed
                    for the  periods  ending  March 31,  1996 and June 30,  1996
                    (File No. 0-23044))

         3.2     -  Amended and Restated Bylaws of AMSC (as amended and restated
                    effective  February 29,  1996)(Incorporated  by reference to
                    Exhibit 3.2 to the Company's  Quarterly  Report on Form 10-Q
                    filed for the period ending June, 1996 (File No. 0- 23044))

         9.1     -  Amended and  Restated  Stockholders'  Agreement  dated as of
                    December 1, 1993,  between  AMSC and certain  holders of its
                    capital stock  (Incorporated  by reference to Exhibit 9.1 to
                    the Company's  Registration  Statement on Form S-1 (Reg. No.
                    33- 70468))  10.3 - Contract for an MSAT  Spacecraft,  dated
                    December 7, 1990 between AMSC and Hughes  Aircraft  Company,
                    amended  June 15,  1993  (Amendment  Nos.  1 through  4) and
                    further amended November 11, 1993 (Amendment No. 5), between
                    AMSC Subsidiary Corporation, as assignee of AMSC, and Hughes
                    Aircraft Company  (Incorporated by reference to Exhibit 10.3
                    to the  Company's  Registration  Statement on Form S-1 (Reg.
                    No. 33-70468))

         10.3a   -  Amendment No. 6 to the AMSC Hughes MSAT Spacecraft Contract,
                    dated October 11, 1994, between AMSC Subsidiary Corporation,
                    as   assignee   to  AMSC,   and  Hughes   Aircraft   Company
                    (Incorporated by reference to Exhibit 10.3a to the Company's
                    Annual  Report  on Form  10-K  for  the  fiscal  year  ended
                    December 31, 1994 (File No. 0-23044))


                                     - 29 -





         10.3b  -   Mutual Final Release,  dated October 11, 1994,  between AMSC
                    Subsidiary  Corporation,  Hughes  Aircraft,  Spar  Aerospace
                    Limited  and  Lockheed   Missiles  &  Space  Company,   Inc.
                    (Incorporated by reference to Exhibit 10.3b to the Company's
                    Annual  Report  on Form  10-K  for  the  fiscal  year  ended
                    December 31, 1994 (File No. 0-23044))

         10.3c   -  Amendment No. 7 to the AMSC Hughes MSAT Spacecraft Contract,
                    dated October 11, 1994, between AMSC Subsidiary Corporation,
                    as  assignee to AMSC,  and Hughes  Aircraft  Company  (filed
                    herewith)

         10.7    -  Memorandum  of  Agreement  for  Satellite  Capacity,   dated
                    February 17, 1992,  between AMSC Subsidiary  Corporation and
                    Telesat Mobile Inc., as amended by Amending  Agreement dated
                    October 18, 1993 among AMSC, AMSC Subsidiary Corporation and
                    TMI  Communications  and Company,  Limited  Partnership,  as
                    successor in interest to Telesat Mobile Inc., and as further
                    amended  by  letter   agreement   dated   October  18,  1993
                    (Incorporated  by reference to Exhibit 10.7 to the Company's
                    Registration Statement on Form S-1 (Reg. No. 33-70468))

         10.11   -  Right of First Offer Agreement dated as of November 30, 1993
                    among AMSC, Hughes Communications  Satellite Services, Inc.,
                    Singapore  Telecommunications Ltd., Satellite Communications
                    Investments  Corporation,  Space  Technologies  Investments,
                    Inc.,  Satellite  Mobile  Telephone  Company  L.P.,  Transit
                    Communications, Inc., MTel Space Technologies, L.P. and MTel
                    Space Technologies Corporation (Incorporated by reference to
                    Exhibit  10.11 to the  Company's  Registration  Statement on
                    Form S-1 (Reg. No. 33-70468))

         10.13*  -  Amended and Restated Stock Option Plan (as amended effective
                    May 21, 1997) (Incorporated by reference to Exhibit 10.13 to
                    the  Company's  Registration  Statement  on Form  S-8  (Reg.
                    No.333-30099))

         10.13b* -  Amended   Form   of   Employee   Stock   Option    Agreement
                    (Incorporated by reference to Exhibit 10.3b to the Company's
                    Annual  Report  on Form  10-K  for  the  fiscal  year  ended
                    December 31, 1994 (File No. 0-23044))

         10.13c* -  Form of Restricted Stock Agreement (filed herewith)

         10.1    -  [Reserved.]

         10.15   -  [Reserved.]

         10.16   -  [Reserved.]


                                     - 30 -





         10.17   -  Mobile Terminal Production Agreement, dated October 6, 1992,
                    between  AMSC  Subsidiary   Corporation   and   Westinghouse
                    Electric Corporation acting through Westinghouse  Electronic
                    Systems Company  (Incorporated by reference to Exhibit 10.17
                    to the  Company's  Registration  Statement on Form S-1 (Reg.
                    No. 33-70468))

         10.17a  -  Amendment  No. 1 to Mobile  Terminal  Production  Agreement,
                    dated November 21, 1994, between AMSC Subsidiary Corporation
                    and  Westinghouse   Electric   Corporation   acting  through
                    Westinghouse  Electronic  Systems Company  (Incorporated  by
                    reference to Exhibit  10.17a to the Company's  Annual Report
                    on Form 10-K for the fiscal  year ended  December  31,  1994
                    (File No. 0-23044))

         10.17b  -  Amendment  No. 2 to Mobile  Terminal  Production  Agreement,
                    dated January 23, 1995, between AMSC Subsidiary  Corporation
                    and  Westinghouse   Electric   Corporation   acting  through
                    Westinghouse  Electronic  Systems Company  (Incorporated  by
                    reference to Exhibit  10.17b to the Company's  Annual Report
                    on Form 10-K for the fiscal  year ended  December  31,  1994
                    (File No. 0-23044))

         10.17c  -  Amendment  No. 3 to Mobile  Terminal  Production  Agreement,
                    dated March 21, 1995,  between AMSC  Subsidiary  Corporation
                    and  Westinghouse   Electric   Corporation   acting  through
                    Westinghouse  Electronic  Systems Company  (Incorporated  by
                    reference to Exhibit  10.17c the Company's  Annual Report on
                    Form 10-K for the fiscal year ended  December 31, 1994 (File
                    No. 0-23044))

         10.18   -  Mobile  Terminal  Production  Contract,  dated  November 30,
                    1992,  between AMSC  Subsidiary  Corporation  and Mitsubishi
                    Electric  Corporation  (Incorporated by reference to Exhibit
                    10.18 to the  Company's  Registration  Statement on Form S-1
                    (Reg. No. 33-70468))

         10.18a  -  Addendum  Number One dated June 29, 1994, to Mobile Terminal
                    Production Contract between AMSC Subsidiary  Corporation and
                    Mitsubishi Electric  Corporation  (Incorporated by reference
                    to Exhibit 10.18a to the Company's  Quarterly Report on Form
                    10-Q  filed  for the  period  ending  June  30,  1994  (File
                    No.0-23044))

         10.18b  -  Memorandum of Agreement,  dated  November 30, 1994,  between
                    AMSC   Subsidiary   Corporation   and  Mitsubishi   Electric
                    Corporation  (Incorporated by reference to Exhibit 10.18b to
                    the Company's Annual Report on Form 10-K for the fiscal year
                    ended December 31, 1994 (File No. 0-23044))

         10.19   -  Codec License Agreement,  dated February 2, 1993 and amended
                    March 26, 1993,  between  AMSC  Subsidiary  Corporation  and
                    Digital Voice Systems,  Inc.  (Incorporated  by reference to
                    Exhibit  10.19 to the  Company's  Registration  Statement on
                    Form S-1 (Reg. No. 33-70468))


                                     - 31 -





                   
         10.20   -  Deed of Lease at Reston,  Virginia,  dated  February 4, 1993
                    and  amended   June  21,  1993,   between  AMSC   Subsidiary
                    Corporation  and  Trust  Company  of  the  West  as  Trustee
                    (Incorporated by reference to Exhibit 10.20 to the Company's
                    Registration Statement on Form S-1 (Reg. No. 33-70468))

         10.20a  -  Amendment  No. 4 to Deed of Lease,  dated  October  7, 1994,
                    between AMSC Subsidiary Corporation and Trust Company of the
                    West as Trustee (Incorporated by reference to Exhibit 10.20a
                    to the  Company's  Annual Report on Form 10-K for the fiscal
                    year ended December 31, 1994 (File No. 0-23044))

         10.21   -  Authorized Service Provider Agreement,  dated March 1, 1993,
                    between  AMSC  Subsidiary  Corporation  and  McCaw  Cellular
                    Communications,  Inc.  (Incorporated by reference to Exhibit
                    10.21 to the  Company's  Registration  Statement on Form S-1
                    (Reg. No. 33-70468))

         10.23   -  Term  Loan  Agreement  dated  May  28,  1993,  between  AMSC
                    Subsidiary   Corporation   and  Northern   Telecom   Finance
                    Corporation,  amended by letter  agreement dated October 14,
                    1993  between  AMSC  Subsidiary   Corporation  and  Northern
                    Telecom Finance  Corporation.  (Incorporated by reference to
                    Exhibit  10.23 to the  Company's  Registration  Statement on
                    Form S-1 (Reg. No. 33-70468))

         10.23a  -  First  Amendment to Term Loan Agreement dated as of April 8,
                    1994,  between  AMSC  Subsidiary  Corporation  and  Northern
                    Telecom Finance  Corporation  (Incorporated  by reference to
                    Exhibit  10.23a to the  Company's  Quarterly  Report on Form
                    10-Q filed for the  period  ending  June 30,  1994 (File No.
                    0-23044))

         10.23b  -  Second  Amendment  to Term Loan  Agreement,  dated August 1,
                    1995,  between  AMSC  Subsidiary  Corporation  and  Northern
                    Telecom Finance  Corporation.  (Incorporated by reference to
                    Exhibit  10.23b to the  Company's  Quarterly  Report on Form
                    10-Q filed for the period  ending  September  30, 1995 (File
                    No. 0-23044))

         10.23c  -  Third  Amendment to Term Loan  Agreement,  dated November 7,
                    1995,  between  AMSC  Subsidiary  Corporation  and  Northern
                    Telecom Finance  Corporation  (Incorporated  by reference to
                    Exhibit  10.23c to the  Company's  Quarterly  Report on Form
                    10-Q filed for the period  ending  September  30, 1996 (File
                    No. 0-23044))


                                     - 32 -





         10.23d  -  Fourth  Amendment to Term Loan  Agreement,  dated October 1,
                    1996,  between  AMSC  Subsidiary  Corporation  and  Northern
                    Telecom Finance  Corporation  (Incorporated  by reference to
                    Exhibit  10.23d to the  Company's  Quarterly  Report on Form
                    10-Q filed for the period  ending  September  30, 1996 (File
                    No. 0-23044))

         10.23e  -  Fifth Amendment to Term Loan  Agreement,  dated December 19,
                    1997,  between AMSC Subsidiary  Corporation and NTFC Capital
                    Corporation  (formerly  known as  Northern  Telecom  Finance
                    Corporation) (filed herewith)

         10.24a  -  Volume Purchasing  Agreement,  dated March 10, 1995, between
                    AMSC  Subsidiary  Corporation  and  TNL  Navigation  Limited
                    (Incorporated   by  reference  to  Exhibit   10.24a  to  the
                    Company's  Annual  Report on Form 10-K for the  fiscal  year
                    ended December 31, 1994 (File No. 0-23044))

         10.24b  -  First Amendment to Volume Purchasing Agreement,  dated March
                    10,  1995,  between  Trimble  Navigation  Limited  and  AMSC
                    (Incorporated   by  reference  to  Exhibit   10.24b  to  the
                    Company's  Annual  Report on Form 10-K for the  fiscal  year
                    ended December 31, 1996 (File No. 0-23044))

         10.24c  -  Second  Amendment  to  Volume  Purchasing  Agreement,  dated
                    January 28, 1997,  between  Trimble  Navigation  Limited and
                    AMSC  (Incorporated  by reference  to Exhibit  10.24c to the
                    Company's  Annual  Report on Form 10-K for the  fiscal  year
                    ended December 31, 1996 (File No. 0-23044))

         10.24d  -  Third Amendment to Volume Purchasing Agreement, dated August
                    29, 1997, between Trimble Navigation Limited and AMSC (filed
                    herewith)

         10.25   -  Master Lease  Agreement,  dated June 23, 1993,  between AMSC
                    Subsidiary Corporation and Digital Equipment Corporation and
                    Amendment to Master Lease Agreement  between AMSC Subsidiary
                    Corporation and Digital  Equipment  Corporation dated August
                    2, 1993  (Incorporated  by reference to Exhibit 10.25 to the
                    Company's  Registration  Statement  on Form  S-1  (Reg.  No.
                    33-70468))

         10.26   -  [Reserved]

         10.27   -  Telemetry, Tracking and Control Satellite Service Agreement,
                    dated  as  of  August  5,  1993,   between  AMSC  Subsidiary
                    Corporation and Hughes  Communications  Satellite  Services,
                    Inc.  (Incorporated  by  reference  to Exhibit  10.27 to the
                    Company's  Registration  Statement  on Form  S-1  (Reg.  No.
                    33-70468))

         10.28   -  [Reserved]

                                     - 33 -





         10.29   -  [Reserved]

         10.30   -  Agreement  dated  October  11,  1993,  among  AMSC,   Hughes
                    Communications    Satellite   Services,    Inc.,   Singapore
                    Telecommunications  Ltd.,  Space  Technologies  Investments,
                    Inc.,  MTel Space  Technologies  Corporation  and MTel Space
                    Technologies,  L.P.  (Incorporated  by  reference to Exhibit
                    10.30 to the  Company's  Registration  Statement on Form S-1
                    (Reg. No. 33-70468))

         10.31   -  [Reserved]

         10.32   -  Agreement  for  Cooperation  in  Joint  Procurement  of  MSS
                    Systems,  dated September 19, 1988,  between American Mobile
                    Satellite   Consortium   Inc.   and   Telesat   Mobile  Inc.
                    (Incorporated by reference to Exhibit 10.32 to the Company's
                    Registration Statement on Form S-1 (Reg. No. 33-70468))

         10.33   -  Joint  Operating  Agreement,  dated April 25, 1990,  between
                    AMSC  and  Telesat   Mobile  Inc.  as  amended  by  Amending
                    Agreement dated October 18, 1993 among AMSC, AMSC Subsidiary
                    Corporation  and TMI  Communications  and  Company,  Limited
                    Partnership, as successor in interest to Telesat Mobile Inc.
                    (Incorporated by reference to Exhibit 10.33 to the Company's
                    Registration Statement on Form S-1 (Reg. No. 33-70468))

         10.34*  -  Employee Stock Purchase Plan  (Incorporated  by reference to
                    Exhibit  10.34 to the  Company's  Registration  Statement on
                    Form S-1 (Reg. No. 33-70468))

         10.35   -  Agreement  dated  as  of  December  14,  1992  between  AMSC
                    Subsidiary   Corporation   and  GTE   Spacenet   Corporation
                    (Incorporated by reference to Exhibit 10.35 to the Company's
                    Registration Statement on Form S-1 (Reg. No. 33-70468))

         10.35a  -  Amendment  No.  1  dated  as of  November  7,  1997  to  the
                    Agreement  dated as of December  14,  1992,  by GTE Spacenet
                    Corporation and AMSC Subsidiary Corporation (filed herewith)

         10.36a  -  Master  Agreement dated March 30, 1994,  between  Washington
                    International  Teleport,  Inc.,  and AMSC  (Incorporated  by
                    reference to Exhibit  10.36a to the Company's  Annual Report
                    on Form 10-K for the fiscal  year ended  December  31,  1993
                    (File No. 0-23044))

         10.36b  -  Contract  Amendment  No. A001,  dated July 1, 1994,  between
                    Washington    International   Teleport,   Inc.,   and   AMSC
                    (Incorporated   by  reference  to  Exhibit   10.36b  to  the
                    Company's Quarterly Report on Form 10-Q filed for the period
                    ending September 30, 1994 (File No. 0-23044))


                                     - 34 -





                   
         10.36c  -  Contract  Amendment  No. A002,  dated July 1, 1994,  between
                    Washington    International   Teleport,   Inc.,   and   AMSC
                    (Incorporated   by  reference  to  Exhibit   10.36c  to  the
                    Company's Quarterly Report on Form 10-Q filed for the period
                    ending September 30, 1994 (File No. 0-23044))

         10.37   -  [Reserved.]

         10.3    -  [Reserved.]

         10.39   -  [Reserved.]

         10.40   -  [Reserved.]

         10.41*  -  Form of  Directors  and Officers  Indemnification  Agreement
                    (Incorporated by reference to Exhibit 10.41 to the Company's
                    Annual  Report  on Form  10-K  for  the  fiscal  year  ended
                    December 31, 1993 (File No. 0-23044))

         10.42   -  DTE Design, Development,  and Manufacturing Agreement, dated
                    September 28, 1994, between AMSC Subsidiary  Corporation and
                    Omnidata  International,  Inc. (Incorporated by reference to
                    Exhibit  10.42 to the  Company's  Annual Report on Form 10-K
                    for the  fiscal  year  ended  December  31,  1994  (File No.
                    0-23044))

         10.43   -  [Reserved.]

         10.44   -  CAL  Corporation   Agreement  for  the  development  of  the
                    aeronautical MSAT terminal, dated December 22, 1994, between
                    AMSC    Subsidiary    Corporation    and   CAL   Corporation
                    (Incorporated by reference to Exhibit 10.44 to the Company's
                    Annual  Report  on Form  10-K  for  the  fiscal  year  ended
                    December 31, 1994 (File No. 0- 23044))

         10.45   -  Contract  for System  Enhancement,  dated  February 1, 1994,
                    between  AMSC  Subsidiary   Corporation   and   Westinghouse
                    Electric Corporation acting through Westinghouse  Electronic
                    Systems Company  (Incorporated by reference to Exhibit 10.45
                    to the  Company's  Annual Report on Form 10-K for the fiscal
                    year ended December 31, 1994 (File No. 0-23044))

         10.46   -  Agreement for the Manufacture,  Delivery and Installation of
                    Satellite Communications Equipment Supporting 6 TDMs per LES
                    and working to AMSC  Satellite,  dated  November  21,  1994,
                    between Hughes Network  Systems  Limited and AMSC Subsidiary
                    Corporation  (Incorporated  by reference to Exhibit 10.46 to
                    the Company's Annual Report on Form 10-K for the fiscal year
                    ended December 31, 1994 (File No. 0-23044))

                                     - 35 -





                    
         10.46a  -  Amendment One to Agreement Number 742-94, dated December 15,
                    1994,  between  Hughes  Network  Systems  Limited  and  AMSC
                    Subsidiary Corporation (Incorporated by reference to Exhibit
                    10.46a to the  Company's  Annual Report on Form 10-K for the
                    fiscal year ended December 31, 1994 (File No. 0-23044))

         10.47   -  [Reserved.]

         10.48   -  [Reserved.]

         10.49   -  General   Services   Agreement   between   AMSC   Subsidiary
                    Corporation  and  AT&T  Corp.,  acting  though  its  Network
                    Systems Group, dated April 4, 1995 (certain attachments have
                    not been  provided and will be  furnished to the  Commission
                    upon request) (Incorporated by reference to Exhibit 10.49 to
                    the  Company's  Quarterly  Report on Form 10-Q filed for the
                    period ending June 30, 1995 (File No. 0-23044))

         10.51   -  Agreement  for  Development  of  High-Gain  Maritime  Mobile
                    Terminals  between  AMSC  and  KVH  Industries,  Inc.  dated
                    September  19, 1995.  (Incorporated  by reference to Exhibit
                    10.51 to the Company's  Annual Report on Form 10-K filed for
                    the period ended December 31, 1996 (File No. 0-23044))

         10.52   -  Private Voice Network Service,  Satellite Telephone Service,
                    Facsimile,  and  Circuit  Switched  Data  Service  Agreement
                    between AMSC and AT&T  Corporation  dated  October 17, 1995.
                    (Incorporated by reference to Exhibit 10.52 to the Company's
                    Annual  Report  on Form  10-K  filed  for the  period  ended
                    December 31, 1996 (File No. 0-23044))

         10.53*  -  1994  Stock   Option   Plan  for   Non-Employee   Directors.
                    (Incorporated by reference to Exhibit 10.53 to the Company's
                    Annual  Report  on Form  10-K  filed  for the  period  ended
                    December 31, 1996 (File No. 0-23044))

         10.54*  -  Form of Executive  Agreements  (Incorporated by reference to
                    Exhibit  10.54 to the  Company's  Annual Report on Form 10-K
                    filed for the  period  ending  December  31,  1996 (File No.
                    0-23044))

         10.55   -  $150,000,000  Credit  Agreement  dated as of June 28,  1996,
                    among AMSC Subsidiary Corporation, American Mobile Satellite
                    Corporation, the Banks Listed Therein, Morgan Guaranty Trust
                    Company of New York,  as  Documentation  Agent,  and Toronto
                    Dominion   (Texas),    Inc.,   as   Administrative    Agent.
                    (Incorporated by reference to Exhibit 10.55 to the Company's
                    Quarterly  Report on Form 10-Q  filed for the  period  ended
                    June 30, 1996 (File No. 0-23044))


                                     - 36 -





                    
         10.56   -  $75,000,000  Credit  Agreement  dated as of June  28,  1996,
                    among AMSC Subsidiary Corporation, American Mobile Satellite
                    Corporation, the Banks Listed Therein, Morgan Guaranty Trust
                    Company of New York,  as  Documentation  Agent,  and Toronto
                    Dominion   (Texas),    Inc.,   as   Administrative    Agent.
                    (Incorporated by reference to Exhibit 10.56 to the Company's
                    Quarterly  Report on Form 10-Q  filed for the  period  ended
                    June 30, 1996 (File No. 0-23044))

         10.57   -  Guaranty  Issuance  Agreement  dated as of June 28, 1996, by
                    and  among   Hughes   Electronics   Corporation,   Singapore
                    Telecommunications  Ltd., Baron Capital Partners, L.P., AMSC
                    Subsidiary   Corporation  and  American   Mobile   Satellite
                    Corporation (Incorporated by reference to Exhibit XII to the
                    Amended and Restated  Schedule 13D dated July 1, 1996, filed
                    by Hughes  Communications  Satellite Services,  Inc., Hughes
                    Communications,   Inc.,  Hughes  Aircraft  Company,   Hughes
                    Electronics  Corporation and General Motors Corporation with
                    respect  to shares  of  Common  Stock,  $.01 par  value,  of
                    American Mobile  Satellite  Corporation).  (Incorporated  by
                    reference to Exhibit 10.57 to the Company's Quarterly Report
                    on Form 10-Q filed for the period  ended June 30, 1996 (File
                    No. 0-23044))

         10.57a  -  Amendment No. 1 to Guaranty Issuance Agreement,  dated as of
                    March 27, 1997  (Incorporated by reference to Exhibit 10.57a
                    to the  Company's  Annual  Report on Form 10-K filed for the
                    period ending December 31, 1996 (File No. 0- 23044))

         10.58   -  Guaranty  dated  as  of  June  28,  1996,   made  by  Hughes
                    Electronics  Corporation to Toronto Dominion (Texas),  Inc.,
                    as  Administrative  Agent.  (Incorporated  by  reference  to
                    Exhibit 10.58 to the Company's Quarterly Report on Form 10-Q
                    filed for the period ended June 30, 1996 (File No. 0-23044))

         10.59   -  Warrant No. 1 for the Purchase of 3,750,000  Shares (subject
                    to adjustment) of Common Stock of American Mobile  Satellite
                    Corporation issued to Hughes Electronics Corporation,  dated
                    June 28, 1996  (Incorporated by reference to Exhibit XIII to
                    the Amended and  Restated  Schedule  13D dated July 1, 1996,
                    filed by Hughes  Communications  Satellite  Services,  Inc.,
                    Hughes Communications, Inc., Hughes Aircraft Company, Hughes
                    Electronics  Corporation and General Motors Corporation with
                    respect  to shares  of  Common  Stock,  $.01 par  value,  of
                    American Mobile  Satellite  Corporation).  (Incorporated  by
                    reference to Exhibit 10.57 to the Company's Quarterly Report
                    on Form 10-Q filed for the period  ended June 30, 1996 (File
                    No. 0-23044))

                                     - 37 -





                    
         10.60  -   Registration  Rights  Agreement  dated as of June 28,  1996,
                    among  American   Mobile   Satellite   Corporation,   Hughes
                    Electronics Corporation,  Singapore Telecommunications Ltd.,
                    and Baron Capital Partners,  L.P. (Incorporated by reference
                    to Exhibit  XIV to the  Amended and  Restated  Schedule  13D
                    dated July 1, 1996, filed by Hughes Communications Satellite
                    Services, Inc., Hughes Communications, Inc., Hughes Aircraft
                    Company,  Hughes Electronics  Corporation and General Motors
                    Corporation with respect to shares of Common Stock, $.01 par
                    value,   of   American   Mobile   Satellite    Corporation).
                    (Incorporated by reference to Exhibit 10.57 to the Company's
                    Quarterly  Report on Form 10-Q  filed for the  period  ended
                    June 30, 1996 (File No. 0-23044))

         10.61  -   Asset Sale  Agreement  dated as of November 22, 1996, by and
                    among  Rockwell  Collins,  Inc.  American  Mobile  Satellite
                    Corporation and AMSC Subsidiary Corporation (Incorporated by
                    reference to Exhibit 10.61 to the Company's  Current  Report
                    on Form 8-K dated  November 22, 1996,  and filed on December
                    9, 1996 (File No. 0-23044))

         10.62  -   Satellite Lease Agreement for the AMSC-1 Satellite, dated as
                    of   December  2,  1997,   By  and  Among  AMSC   Subsidiary
                    Corporation,   American  Mobile  Satellite  Corporation  and
                    African Continental Telecommunications Ltd. (Incorporated by
                    reference to Exhibit 10.61 to the Company's  Current  Report
                    on Form 8-K dated December 4, 1997 (File No. 0-23044))

         10.63  -   Satellite Purchase Agreement,  dated as of December 2, 1997,
                    by  and  Among  TMI  Communications  and  Company,   Limited
                    Partnership  and AMSC  Subsidiary  Corporation  and American
                    Mobile Satellite Corporation.  (Incorporated by reference to
                    Exhibit  10.61 to the Company's  Current  Report on Form 8-K
                    dated December 4, 1997 (File No. 0-23044))

         10.64  -   Bridge Loan  Agreement,  dated as of December 30, 1997, made
                    by and among AMSC  Subsidiary  Corporation,  American Mobile
                    Satellite  Corporation and Hughes  Communications  Satellite
                    Services, Inc. (filed herewith)

         10.64a -   Pledge  Agreement  dated as of December  30,  1997,  made by
                    American    Mobile    Satellite    Corporation   to   Hughes
                    Communications Satellite Services, Inc. (filed herewith)

         10.64b -   Term Note for  $10,000,000  dated  December  30, 1997 (filed
                    herewith)


                                     - 38 -





         10.65   -  Stock  Purchase  Agreement for the  Acquisition  of Motorola
                    ARDIS  Acquisition,  Inc. and Motorola  ARDIS,  Inc. by AMSC
                    Acquisition  Company,  Inc., a Wholly-  Owned  Subsidiary of
                    American Mobile Satellite Corporation,  Dated as of December
                    31, 1997 (filed herewith)

         10.66   -  Participation Rights Agreement by and among Motorola,  Inc.,
                    American  Mobile  Satellite  Corporation,  and  the  parties
                    listed on Schedule  A, dated as of December  31, 1997 (filed
                    herewith)

         11.1    -  Computation of Net Loss Per Share (filed herewith)

         21.1    -  Subsidiaries of American Mobile (filed herewith)

         23.1    -  Consent of Arthur Andersen LLP (filed herewith)

         27.1    -  Financial Data Schedule (filed herewith)

- ------------------------------------

*Management contract or compensatory plan or arrangement required to be filed as
an exhibit to this report pursuant to Item 14(c) of this report.



                                     - 39 -





(b)      Reports on Form 8-K:

          On December 8, 1997,  the Company filed a Current  Report on Form 8-K,
          describing in response to Item 5-Other  Events,  regarding the Company
          entering  into two  simultaneous  transactions:  (i)  Satellite  Lease
          Agreement  for the  AMSC-1  Satellite,  By and Among  AMSC  Subsidiary
          Corporation,   American  Mobile  Satellite   Corporation  and  African
          Continental  Telecommunications and (ii) Satellite Purchase Agreement,
          By and Among TMI Communications and Company,  Limited  Partnership and
          AMSC Subsidiary Corporation and American Mobile Satellite Corporation.

          On January 5, 1998,  the Company  filed a Current  Report on Form 8-K,
          describing in response to Item 5-Other Events,  in the form of a press
          release,  regarding  the Company  entering  into two  agreements:  (i)
          Bridge Loan Agreement with Hughes  Communications  Satellite Services,
          Inc. and (ii) Stock Purchase  Agreement  with  Motorola,  Inc. for the
          acquisition of ARDIS Company.

          On January 13,  1998,  the Company  filed an  Amendment to its Current
          Report on Form 8-K/A  amending and restating  under Item 7 - Financial
          Statements, Pro Forma Financial Information and Exhibits the financial
          statements  to  American  Mobile's  acquisition  previously  filed  on
          February 6, 1997.  On January 22,  1998,  the Company  filed a Current
          Report on Form 8-K, describing in response to Item 5-Other Events, the
          resignation  of director  David A. Juliano and the election of Douglas
          I. Brandon to fill the vacancy created by Mr. Juliano's resignation.

          On March 9,  1998,  the  Company  filed a Current  Report on Form 8-K,
          describing  in  response  to Item  5-Other  Events,  an  excerpt  of a
          financing  document of American Mobile  Satellite  Corporation and its
          subsidiary, AMSC Acquisition Company, Inc.


                                     - 40 -





SIGNATURES

Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange
Act of 1934,  the  registrant  has duly  caused  this report to be signed on its
behalf by the undersigned, thereunto duly authorized.

                                           AMERICAN MOBILE SATELLITE CORPORATION


                                            By       /s/ Gary M. Parsons

                                                     Gary M. Parsons
                                                     Chief Executive Officer and
                                                        Chairman of the Board

Date:   March 31, 1998

Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following  persons on behalf of the  registrant and
in the capacities and on the dates indicated.

/s/Gary M. Parsons              Chief Executive Officer           March 31, 1998
Gary M. Parsons                 Chairman of the Board
                                (principal executive officer)

/s/Stephen D. Peck              Vice President and Chief          March 31, 1998
Stephen D. Peck                 Financial Officer
                                (principal financial and 
                                 accounting officer)


/s/Douglas I. Brandon           Director                          March 31, 1998
Douglas I. Brandon


/s/Steven D. Dorfman            Director                          March 31, 1998
Steven D. Dorfman


/s/Ho Siaw Hong                 Director                          March 31, 1998
Ho Siaw Hong


______________________          Director                          March 31, 1998
Billy J. Parrott




                                     - 41 -









/s/Andrew A. Quartner           Director                          March 31, 1998
Andrew A. Quartner


/s/Jack A. Shaw                 Director                          March 31, 1998
Jack A. Shaw


/s/Roderick M. Sherwood, III    Director                          March 31, 1998
Roderick M. Sherwood, III


_______________________         Director                          March 31, 1998
Michael T. Smith


/s/Yap Chee Keong               Director                          March 31, 1998
Yap Chee Keong


/s/Albert L. Zesiger            Director                          March 31, 1998
Albert L. Zesiger


                                  





                                      -42-








                                      INDEX



Management's Discussion and Analysis of Financial Condition
          and Results of Operations.......................................F - 1

Report of Independent Public Accountants..................................F - 15

Consolidated Statements of Loss...........................................F - 16

Consolidated Balance Sheets...............................................F - 17

Consolidated Statements of Stockholders' Equity...........................F - 18

Consolidated Statements of Cash Flows.....................................F - 19

Notes to Consolidated Financial Statements................................F - 20

Quarterly Financial Data..................................................F - 49

Selected Financial Data...................................................F - 50

















                                       F-i





          Management's Discussion and Analysis of Financial Condition
                           and Results of Operations

This Annual Report on Form 10-K includes "forward-looking statements" within the
meaning of Section  27A of the  Securities  Act of 1933 and  Section  21E of the
Securities  Exchange Act of 1934.  Such  statements are identified by the use of
forward-looking  words or phrases  including,  but not limited  to,  "believes,"
"intended,"   "will  be   positioned,"   "expects,"   "expected,"   "estimates,"
"anticipates" and "anticipated." These  forward-looking  statements are based on
the Company's  current  expectations.  All statements  other than  statements of
historical  facts included in this Annual Report,  including those regarding the
Company's financial position,  business strategy,  projected costs and financing
needs,  and plans and  objectives  of  management  for  future  operations,  are
forward-looking statements.  Although the Company believes that the expectations
reflected in such  forward-looking  statements are  reasonable,  there can be no
assurance  that  such  expectations  will  prove to have been  correct.  Because
forward-looking statements involve risks and uncertainties, the Company's actual
results  could  differ  materially.  Important  factors  that could cause actual
results  to  differ  materially  from the  Company's  expectations  ("Cautionary
Statements")  are disclosed under  "Business" and  "Management's  Discussion and
Analysis of Financial  Condition  and Results of  Operations,"  and elsewhere in
this Annual Report,  including,  without  limitation,  in  conjunction  with the
forward-looking statements included in this Annual Report. These forward-looking
statements  represent the  Company's  judgment as of the date hereof and readers
are cautioned not to place undue reliance on these  forward-looking  statements.
All subsequent written and oral forward-looking  statements  attributable to the
Company or persons  acting on behalf of the Company are  expressly  qualified in
their entirety by the Cautionary Statements. Readers should carefully review the
risk factors  described in other  documents  the Company files from time to time
with the  Securities  and Exchange  Commission,  including the Current Report on
Form 8-K filed on March 9, 1998, and Form 10-Q Quarterly  Reports to be filed by
the Company  subsequent to this Form 10-K Annual Report and any Current  Reports
on Form 8-K and registration statements filed by the Company.


General

The following  discussion and analysis  provides  information  which  management
believes  is  relevant  to an  assessment  and  understanding  of the  financial
condition and  consolidated  results of operations of American Mobile  Satellite
Corporation  (with its subsidiaries,  "American  Mobile" or the "Company").  The
discussion  should  be read  in  conjunction  with  the  consolidated  financial
statements and notes thereto.

American Mobile  Satellite  Corporation was  incorporated in May 1988 and, until
1996,  was a  development  stage  company,  engaged  primarily  in  the  design,
development,  construction,  deployment  and  financing  of a  mobile  satellite
communication  system.  On December 31, 1997,  the Company  entered into a Stock
Purchase Agreement (the "Purchase Agreement") with Motorola,  Inc. ("Motorola"),
for  the  acquisition  (the   "Acquisition")  of  ARDIS  Company  ("ARDIS"),   a
wholly-owned  subsidiary of Motorola  that owns and operates a two-way  wireless
data  communications  network.  On March 3,  1998,  the FCC  granted  consent to
consummate  the  Acquisition.  On March 31, 1998,  the  Acquisition  and related


                                       F-1




financing  were  completed.  See  "Liquidity  and Capital  Resources."  With the
acquisition  of ARDIS,  the Company  becomes a leading  provider  of  nationwide
wireless communications  services,  including data, dispatch and voice services,
primarily to business  customers in the United States.  The Company will offer a
broad  range of  end-to-end  wireless  solutions  utilizing  a seamless  network
consisting of the nation's largest,  most  fully-deployed  terrestrial  wireless
data network (the "ARDIS Network") and a satellite in geosynchronous  orbit (the
"Satellite Network")(together, the "Network").

In connection with the  Acquisition,  the Company and its  subsidiaries  entered
into agreements with respect to the following  financings and refinancings:  (1)
$335  million of Units;  (2) the  restructuring  of its  existing  $200  million
Revolving  Credit Facility and Term Loan Facility  (collectively,  the "New Bank
Financings");  and (3) $10 million  commitment  with respect to Motorola  vendor
financing.  See "Management's Discussion and Analysis of Financial Condition and
Results of Operations - Liquidity and Capital Resources."

On October 16, 1997,  American Mobile Radio Corporation,  an indirect subsidiary
of American  Mobile through its subsidiary  AMRC Holdings,  Inc.  (together with
American Mobile Radio Corporation,  "AMRC"), was awarded a license by the FCC to
provide  satellite-based  Digital Audio Radio Service  ("DARS")  throughout  the
United States, following its successful $89.9 million bid at auction on April 2,
1997.  American  Mobile has entered  into an  agreement  with  WorldSpace,  Inc.
("WorldSpace"), by which WorldSpace has acquired a 20% participation in AMRC. In
connection  with the DARS  auction,  AMRC has also arranged for financing of the
FCC license fees as well as for initial working  capital needs,  which financing
has included the issuance of options.  Under the terms of AMRC's  financing  and
contingent on FCC approval,  exercise of the  outstanding  issued  options could
result in the dilution of American Mobile's  ownership  interest in AMRC to 28%.
Additionally,  the agreement gives WorldSpace certain participation rights which
provide  for  their  participation  in  significant  business  decisions  in the
ordinary course of business.  As a result, AMRC is carried on the equity method.
The operations and financing of AMRC are maintained  separate and apart from the
operations and financing of American Mobile (see "Liquidity and Financing").

On  December  4, 1997,  the  Company  entered  into an  agreement  with  African
Continental  Telecommunications Ltd. ("ACTEL") to lease the Company's satellite,
"MSAT-2" (the  "Satellite  Lease  Agreement")  for deployment  over  sub-Saharan
Africa.  Simultaneously,  the Company agreed with TMI Communications and Company
Limited  Partnership  ("TMI") to acquire a one-half  ownership interest in TMI's
satellite,  "MSAT-1" (the "Satellite Purchase Agreement"). See Item I. "Business
- -- Satellite Lease and Purchase Agreement", "-Satellite Back-up and Technology,"
and Management's  Discussion and Analysis of Financial  Condition and Results of
Operations - Liquidity and Capital Resources."

In  late 1996 the  Company   expanded  its  mobile  data  business  through  the
acquisition  of  Rockwell  International  Corporation's  ("Rockwell")  dual mode
mobile  messaging and global  positioning and monitoring  service for commercial
trucking fleets  ("MCSS").  In the transaction,  the Company assumed  Rockwell's
existing customer contracts,  and acquired Rockwell's system  infrastructure for


                                       F-2




delivering  their  mobile  data  product,  as well as  Rockwell's  rights to the
multi-mode,  satellite-terrestrial  product.  The  assets of the  business  were
acquired  through the  assumption of the various  contracts and  obligations  of
Rockwell relating to the business;  no additional payments were made to Rockwell
under the terms of the Asset Sale  Agreement  dated as of November 22, 1996. See
"Liquidity and Capital Resources."

Management  believes the period to period comparison of the Company's  financial
results  are not  necessarily  meaningful  and should  not be relied  upon as an
indication of future  operating  performance  due to the Company's  historically
high growth rate and the acquisition of MCSS and ARDIS.


Overview

Each of American Mobile and ARDIS has incurred significant  operating losses and
negative cash flows in each year since it commenced operations, due primarily to
start-up  costs,  the costs of developing and building each network and the cost
of developing,  selling and providing its respective products and services.  The
Company is, and will continue to be, highly leveraged.  As of December 31, 1997,
on a pro forma basis,  the Company would have had  indebtedness of approximately
$454.9 million,  assuming the  Acquisition,  the issuance of the $335 million of
Units, and restructuring of the bank financing (see "Recent Financing Activity")
occurred on December 31, 1997.

The Company's future operating  results could be adversely  affected by a number
of uncertainties and factors, including (i) the timely completion and deployment
of  future  products  and  related  services,   including  among  other  things,
availability of mobile telephones, data terminals and other equipment to be used
with the Network  ("Subscriber  Equipment") being  manufactured by third parties
over which the Company has limited control,  (ii) the market's acceptance of the
Company's  services,  (iii) the  ability  and the  commitment  of the  Company's
distribution channels to market and distribute the Company's services,  (iv) the
Company's  ability to modify  its  organization,  strategy  and  product  mix to
maximize the market  opportunities in light of changes therein,  (v) competition
from existing  companies that provide  services  using  existing  communications
technologies  and the  possibility  of  competition  from  companies  using  new
technology  in  the  future,   (vi)  capacity   constraints   arising  from  the
reconfiguration of MSAT-2,  subsequent anomalies affecting MSAT-2 and MSAT-1, or
the power management  recommendation affecting both MSAT-2 and MSAT-1 previously
reported,  (vii)  additional  technical  anomalies  that may  occur  within  the
Satellite  Network,  including those relating to MSAT-1 and MSAT-2,  which could
impact, among other things, the operation of the Satellite Network and the cost,
scope  or  availability  of  in-orbit  insurance,  (viii)  subscriber  equipment
inventory  responsibilities and liabilities assumed by the Company including the
ability of the Company to realize the value of its inventory in a timely manner,
(ix) the Company's ability to secure  additional  financing as may be necessary,
(x) the  Company's  ability to respond and react to changes in its  business and
the  industry  as a result of being  highly  leveraged,  (xi) the ability of the
Company  to  successfully  integrate  ARDIS  and  to  achieve  certain  business
synergies, and (xii) the ability of the Company to manage growth effectively.


                                       F-3





The  Company's  operating  results  and capital  and  liquidity  needs have been
materially  affected by delays experienced in the acquisition of subscribers and
the related  equipment  sales. As a result,  the Company shifted from a consumer
focus to a business  to business  focus in late 1996.  Such shift has caused the
Company to refocus certain  business  resources and to re-organize the sales and
marketing organization. The impact of this delay has substantially decreased the
Company's anticipated revenues and increased the Company's capital and liquidity
needs.  No  assurance  can be  given  that  additional  delays  relating  to the
acquisition of subscribers  and delayed  equipment sales will not be encountered
in the future and not have an adverse impact on the Company.

As of December 31, 1997, there were approximately  32,400 units on the Satellite
Network.


Years Ended December 31, 1997 and 1996

Service  revenues,  which  include both the Company's  voice and data  services,
approximated  $20.7  million for 1997 as  compared to $9.2  million for 1996 and
represents a 125% increase year over year.  Service  revenue from voice services
increased 100% from  approximately  $5.0 million in 1996 to approximately  $10.0
million in 1997.  The $5.0  million  increase  was  primarily a result of a 101%
increase in voice customers during 1997. Service revenue from the Company's data
services  approximated  $7.6  million in 1997,  as compared to $2.3  million for
1996,  an increase of $5.4 million or 245%.  The increase was primarily a result
of  additional  revenue  from  dual  mode  subscribers  added as a result of the
acquisition,  on November  1996,  of Rockwell's  dual mode mobile  messaging and
global positioning and monitoring  service,  as compared to the revenue received
in 1996 for satellite capacity leased by Rockwell. Service revenue from capacity
resellers, who handle both voice and data services, approximated $2.8 million in
1997,  as compared to $1.8 million in 1996,  an increase of $1.0 million or 56%.
As of December 31, 1997 and 1996,  receivables relating to service revenues were
$3.6 million and $1.8 million, respectively.

Revenue from the sale of mobile data terminals and mobile  telephones  increased
27% from  $18.5  million  in 1996 to $23.5  million  in 1997.  The  increase was
primarily  attributable  to increased  equipment  sales of the dual-mode  mobile
messaging  product,   discussed  above.  As  of  December  31,  1997  and  1996,
receivables  relating to  equipment  revenue  were $5.9 million and $5.8 million
respectively.

Cost of  service  and  operations  for 1997,  which  includes  costs to  support
subscribers  and to operate the Satellite  Network,  were $32.0 million for 1997
and $30.5 million for 1996. Cost of service and operations for 1997 and 1996, as
a percentage of revenues, were 72% and 110%, respectively.  The increase in cost
of  service  and  operations  was  primarily   attributable   to  (i)  increased
interconnect  charges associated with increased service usage by customers,  and
(ii) the  additional  cost  associated  with  supporting  the dual  mode  mobile
messaging  product  discussed  above,  offset  by  a  reduction  in  information
technology  costs  affected by  dramatically  reducing the dependence on outside
consultants.


                                       F-4





The cost of equipment  sold  increased  26% from $31.9  million in 1996 to $40.3
million in 1997. The dollar  increase in the cost of equipment sold is primarily
attributable  to (i) increased  sales as a result of the acquisition of the dual
mode messaging product, (ii) an increase of $600,000 in inventory carrying costs
as certain  subscriber  equipment  contracts were  fulfilled,  and (iii) a $12.0
million write down of inventory to net  realizable  value in 1997 as compared to
$11.1 million write down and reconfiguration charges in 1996.

Sales and  advertising  expenses were $12.1  million in 1997,  compared to $24.5
million in 1996. Sales and advertising  expenses as a percentage of revenue were
27% in 1997 and 88% in 1996. The decrease of sales and advertising expenses  was
primarily  attributable  to (i) a more focused  approach to  advertising  as the
company has moved from consumer markets to targeted  business-to-business sales,
and the resulting  reduction in print  advertising,  (ii) increased costs in the
first  quarter of 1996 for the  development  of  collateral  material  needed to
support the sales effort,  and (iii) costs incurred in the first quarter of 1996
associated with the formal launch of service.

General and  administrative  expenses for 1997 were $14.8  million,  compared to
$17.5 million in 1996. As a percentage  of revenue,  general and  administrative
expenses  represented  34% in 1997 and 63% in 1996.  The decrease in general and
administrative  expenses for 1997 compared to 1996 was primarily attributable to
reductions  made in staffing as a result of a  management  restructuring  in the
third quarter of 1996 and the associated severance costs.

Depreciation  and  amortization  expense was $42.4  million and $43.4 million in
1997 and 1996, respectively,  representing approximately 96% and 156% of revenue
for 1997 and 1996,  respectively.  The overall dollar and percentage decrease in
depreciation and  amortization  expense was attributable to the reduction of the
carrying value of the satellite as a result of the  resolution,  in August 1996,
of claims under the Company's satellite insurance contracts and policies and the
receipt  of  approximately  $66.0  million,  offset by a $1.0  million  one-time
charge, in the second quarter of 1997, associated with increased amortization in
accordance with SFAS No.86 of certain cost associated with software  development
for the mobile data product.

Interest  income was $247,000 in 1997 compared to $552,000 in 1996. The decrease
was a result of lower average cash balances.  The Company incurred $21.6 million
of interest  expense in 1997  compared to $15.2  million of interest  expense in
1996 reflecting (i) the amortization of debt discount and debt offering costs in
the amount of $9.4 million in 1997,  compared to $5.7 million in 1996,  and (ii)
higher  outstanding loan balances as compared to 1996.  During 1997, the Company
received other income in the amount of $875,000  representing  proceeds from the
licensing of certain technology associated with the Satellite Network.

Interest  expense in 1997 was  significant  as a result of borrowings  under the
Bank  Financing,  as well as the  amortization  of borrowing  costs  incurred in


                                       F-5




conjunction  with securing the facility.  It is anticipated  that interest costs
will  continue  to be  significant  as a result  of the Bank  Financing,  Bridge
Financing, and Acquisition, (see "Liquidity and Capital Resources").

Net capital expenditures,  including additions financed through vendor financing
arrangements,  for 1997 for property and equipment were $8.8 million compared to
capital  reductions  of $51.0 million in 1996.  The $59.4  million  increase was
largely  attributable  to (i) the net proceeds in 1996 of $66.0 million from the
resolution of the claims under the Company's  satellite  insurance contracts and
policies (see "Liquidity and Capital  Resources") and (ii) the decrease in asset
acquisitions  associated with the final build-out of the  communications  ground
segment (the "CGS").


Years Ended December 31, 1996 and 1995

Service  revenues,  which  include both the Company's  voice and data  services,
approximated  $9.2  million for 1996 as compared to $6.9  million for 1995 which
represents a 33% increase year over year.  Service  revenue from voice  services
approximated  $5.0  million  in  1996,  including   approximately  $1.3  million
attributable to satellite  capacity leased to TMI, under a commitment  which was
completed  in May 1996.  Service  revenue from the  Company's  data and position
location  services  ("Mobile  Data  Communication  Service")  approximated  $2.2
million in 1996,  as compared to $1.7 for 1995,  an increase of $500,000 or 29%.
Service revenue from capacity resellers who handle both voice and data services,
approximated  $1.8  million in 1996,  as  compared  to $5.2  million in 1995,  a
decrease of $3.4 million or 65%. Prior to 1996, the Company  provided its Mobile
Data   Communication   Service  using   satellite   capacity   leased  from  the
Communications  Satellite Corporation  ("COMSAT"),  the cost of which was passed
through to one  customer  (Rockwell).  The  decrease  in revenue  from  capacity
resellers  reflects  the reduced  revenue  from  Rockwell  resulting  from lower
billings for the use of the lower cost MSAT-2 versus  billings  attributable  to
the leased  COMSAT  satellite  applied on a  pass-through  basis.  As previously
discussed,  the  Company  acquired  the dual mode  mobile  messaging  and global
positioning and monitoring service of Rockwell in November 1996. At December 31,
1996 and 1995,  receivables relating to service revenues were $1.8 and $405,000,
respectively.

Revenue from the sale of mobile data terminals and mobile  telephones  increased
from $1.9 million in 1995 to $18.5 million in 1996,  primarily  attributable  to
(i) the Company's  introduction  of certain voice products in the fourth quarter
of 1995 and the  resulting  sale of mobile  telephones,  and (ii) the  increased
availability  of mobile data  terminals  in 1996  compared  to 1995  following a
contract signed with a mobile data terminal manufacturer in February 1995.

The Company's costs and expenses have primarily increased in connection with the
start  of  full  commercial  service  in  December  1995.  Cost of  service  and
operations for 1996, which includes costs to support  subscribers and to operate
the Satellite Network,  were $30.5 million for 1996, an increase of $6.5 million
from 1995.  Cost of service and operations for 1996 and 1995, as a percentage of
revenue were 110% and 272%, respectively. The dollar increase in cost of service


                                       F-6




and  operations  was  primarily  attributable  to (i)  additional  personnel and
related costs to support both existing and  anticipated  customer  demand,  (ii)
increased  costs  associated  with the  on-going  maintenance  of the  Company's
billing  systems and the CGS, and (iii) $6.5  million of  insurance  expense for
in-orbit  insurance  coverage for MSAT-2,  offset by the  elimination  of COMSAT
lease expense  reflecting  the  transition of the Company's  customers  from the
leased satellite to MSAT-2.

The cost of equipment  sold increased to $31.9 million in 1996 from $4.7 million
in 1995. The increase in cost of equipment sold is primarily attributable to (i)
the Company's  introduction  of certain voice  products in the fourth quarter of
1995 and the  resulting  sale of mobile  telephones,  (ii) the  availability  of
mobile data  terminals in 1996 compared to 1995,  (iii) a $4.2 million charge in
1996 for the  reconfiguration  of certain  components  to better  meet  customer
requirements,  and (iv) a $6.9 million write down of inventory to net realizable
value in 1996.

Sales and  advertising  expenses were $24.5  million in 1996,  compared to $22.8
million in 1995. Sales and advertising  expenses as a percentage of revenue were
88% in 1996 and 259% in 1995. The increase of sales and advertising expenses was
primarily  attributable to (i) additional head count and personnel related costs
associated  with the increase in sales staff,  and (ii) increased costs directly
associated  with the increase in subscriber  acquisition  programs,  offset by a
$1.4 million charge,  in 1995,  associated with the  reacquisition  of defective
equipment located at a customer site and settlement of related disputes.

General and administrative  expenses for 1996 were $17.5 million, an increase of
$0.8  million as  compared to 1995.  As a  percentage  of  revenue,  general and
administrative  expenses  represented  63% in 1996 and 190% in 1995.  The dollar
increase in general and  administrative  expenses for 1996  compared to 1995 was
primarily   attributable  to  (i)  approximately  $675,000  of  severance  costs
associated  with a management  restructuring  and (ii) an increase in facilities
rents and  utilities  of $236,000.  The  decrease of general and  administrative
expenses as a percentage of operating  expenses was  attributable to the overall
increase in operating expenses.

Depreciation  and  amortization  expense was $43.4  million and $11.2 million in
1996 and 1995, respectively, representing approximately 156% and 128% of revenue
for 1996 and 1995,  respectively.  The increase in depreciation and amortization
expense was  attributable to the commencement of depreciation of both MSAT-2 and
related assets and the CGS in the fourth quarter of 1995.

Interest and other income was $552,000 in 1996 compared to $4.5 million in 1995.
The decrease was a result of lower average cash balances.  The Company  incurred
$15.2  million of  interest  expense in 1996  compared  to  $916,000 of interest
expense  in  1995   reflecting   (i)  the   discontinuation   of  interest  cost
capitalization as a result of substantially  completing the Satellite Network in
the fourth  quarter of 1995,  (ii) the  amortization  of debt  discount and debt
offering  costs  (including  Guarantee  Warrants  (see  "Liquidity  and  Capital
Resources")) relating to the Bridge Financing and Bank Financing (see "Liquidity
and Capital Resources"),  and (iii) higher outstanding loan balances as compared
to 1995.


                                       F-7





Net capital  reductions,  including  additions financed through vendor financing
arrangements, for 1996 for property and equipment were $51.0 million compared to
capital  expenditures  of  $86.7  million  in 1995.  The  decrease  was  largely
attributable to (i) the net proceeds of $66.0 million from the resolution of the
claims under the  Company's  satellite  insurance  contracts  and policies  (see
"Liquidity and Capital Resources"),  (ii) the purchase,  in the first quarter of
1995,  of  launch  insurance  at a cost  to the  Company  of  $42.8  million  in
connection with the Company's  launch  contract with Martin Marietta  Commercial
Launch  Services,  Inc.,  and (iii) the  decrease  in  construction  activity as
certain components of the CGS were completed.


Liquidity and Capital Resources

Adequate  liquidity  and capital  are  critical to the ability of the Company to
continue  as a  going  concern  and  to  fund  subscriber  acquisition  programs
necessary  to reach cash  positive  and  profitable  operations.  To satisfy its
ongoing  financing  needs,  the Company,  on June 28, 1996,  established  a $219
million debt facility (the "Bank Financing"), of which $200 million is available
and fully guaranteed by certain American Mobile shareholders (the "Guarantors").
As of December 31, 1997,  the Bank  Financing  consisted  of: (i) a $144 million
five-year,  multi-draw  term loan  facility  (the  "Term  Loan  Facility")  with
quarterly  payments  commencing  March 31, 1999 through and  including  June 30,
2001, and (ii) a $56 million  five-year  revolving credit facility with a bullet
maturity on June 30, 2001 (the "Working  Capital  Facility").  Proceeds from the
Bank  Financing  were  used to repay  the  Company's  interim  financing  and to
refinance short-term vendor financing, and for general working capital purposes.
As previously  reported,  the Company,  on March 27, 1997,  reached an agreement
with the  Guarantors to eliminate all covenant  tests in exchange for additional
warrants and a repricing of warrants previously issued (together, the "Guarantee
Warrants").  As a result of the repricing,  the Guarantee Warrants were revalued
at $21.9  million.  As of March 20,  1998,  the  Company  had drawn down  $144.0
million of the Term Loan Facility at annual  interest  rates ranging from 6.025%
to 6.0875% and $56.0 million of the Working Capital  Facility at annual interest
rates ranging from 6.025% to 6.2125%.

As previously  mentioned (see  "Organization and Business"),  AMRC was a winning
bidder for, and on October 16, 1997,  was awarded an FCC license to provide DARS
throughout the United States.  AMRC has and will continue to receive funding for
this  business  from an  independent  source in exchange  for debt and an equity
interest in AMRC.  Accordingly,  it is not expected that the development of this
business  will have a  material  impact  on the  Company's  financial  position,
results of operations, or cash flows. The Company's equity interest in AMRC may,
however, even on a fully diluted basis, become a material asset of the Company.

In the last quarter of 1997, the Company arranged the financing of certain trade
payables,  and as of December 31, 1997, $11.7 million of deferred trade payables
were outstanding at rates ranging from 6.23% to 14% and are generally payable by
the end of 1998.


                                       F-8





On December 4, 1997, the Company entered into two simultaneous transactions. The
Company  agreed  with TMI to  acquire a  one-half  ownership  interest  in TMI's
satellite, MSAT-1, at a cost of $60 million payable in equal installments over a
five-year  period  (the  "Satellite  Purchase  Agreement");  certain  additional
payments  to TMI are  contemplated  in the event that  additional  benefits  are
realized  by the  Company.  Under  the  Satellite  Purchase  Agreement,  TMI and
American  Mobile will each own a 50% undivided ownership  interest in the Shared
Satellite,  will  jointly  be  responsible  for  the  operation  of  the  Shared
Satellite, and  will  share  certain  satellite  operating  expenses,  but  will
otherwise maintain their separate business operations.

Simultaneously,  the Company  entered into an agreement  (the  "Satellite  Lease
Agreement") with African Continental  Telecommunications Ltd. ("ACTEL"), for the
lease of MSAT-2,  for deployment over  sub-Saharan  Africa.  The five-year lease
provides for  aggregate  lease  payments to the Company of $182.5  million.  The
lease includes a renewal  option  through the end of the life of MSAT-2,  on the
same lease terms, at ACTEL's  election  exercisable 2 1/2 years prior to the end
of the initial lease term.

Closing under the Satellite  Purchase Agreement and Satellite Lease Agreement is
subject  to a number  of  conditions,  including:  United  States  and  Canadian
regulatory approvals,  a successful financing by ACTEL of at least $120 million,
completion of certain  satellite  testing,  inversion and relocation  activities
with  respect to MSAT-2,  to support  the  contemplated  services  over  Africa;
receipt of various government  authorizations  from Gibraltar,  South Africa and
other jurisdictions to support satellite  relocation,  including  authorizations
with  respect to orbital  slot and  spectrum  coordination;  and  completion  of
certain  system   development   activities   sufficient  to  support   satellite
redeployment.  On March 13, 1998, the FCC provided approval of the transactions;
Canadian  government  coordination  and  approvals  remain  outstanding.  It  is
anticipated  that the closing under both the purchase and lease  agreements will
occur simultaneously in the spring of 1998.

On December 31, 1997,  the Company  entered  into a Bridge Loan  Agreement  (the
"Bridge Loan") with Hughes Communications Satellite Services, Inc. ("Hughes") in
the principal amount of up to $10 million,  secured by a pledge of the Company's
interest in its 80%-owned subsidiary,  AMRC Holdings,  Inc. The Bridge Loan bore
an annual  interest  rate of 12%,  had a maturity  date of March 31,  1999,  and
required  mandatory  repayment in the event net  proceeds are received  from any
asset  disposition,  lease  agreement,  financing or equity  transaction  of the
Company.  The Bridge Loan was drawn down in full,  and repaid on March 31, 1998,
with a portion of the proceeds of the Notes (described below).


Recent Financing Activity

$335 Million Unit Offering

In connection  with the  Acquisition,  the Company  issued $335 million of Units
(the  "Units")  consisting of 12 1/4% Senior Notes due 2008 (the  "Notes"),  and


                                       F-9




Warrants to purchase  shares of Common Stock of the Company.  Each Unit consists
of $1,000  principal  amount of Notes and one Warrant to purchase 3.75749 shares
of Common Stock at an exercise  price of $12.51 per share.  A portion of the net
proceeds  of the sale of the Units were used to  finance  the  Acquisition.  The
Notes are fully guaranteed by American Mobile Satellite Corporation.


New Bank Financing

In connection with the Acquisition, the Company, the Acquisition Company and its
subsidiaries  restructured  the existing $200 million Bank  Financing (the "Bank
Financing") to provide for two facilities:  (i) the Revolving Credit Facility, a
$100 million unsecured  five-year reducing  revolving credit facility,  and (ii)
the Term Loan Facility, a $100 million five-year,  term loan facility with up to
three  additional  one-year  extensions  subject to the lenders'  approval.  The
Revolving  Credit  Facility  will rank pari passu with the Notes.  The Term Loan
Facility is secured by the assets of the Company,  principally its stockholdings
in AMRC and the Acquisition Company, and will be effectively subordinated to the
Revolving  Credit  Facility and the Notes.  The New Bank  Financing is severally
guaranteed   by   Hughes   Electronics   Corporation    ("Hughes"),    Singapore
Telecommunications  Ltd. ("Singapore Telecom") and Baron Capital Partners,  L.P.
(the "Bank Facility  Guarantors").  The lenders'  placement fee for the New Bank
Financing is approximately $500,000.


The Revolving Credit Facility

The Revolving  Credit  Facility bears an interest rate,  generally,  of 50 basis
points above London  Interbank  Offered Rate ("LIBOR") and is unsecured,  with a
negative  pledge on the assets of the Acquisition  Company and its  subsidiaries
ranking pari passu with the Notes. The Revolving Credit Facility will be reduced
$10 million each quarter,  beginning with the quarter ending June 30, 2002, with
the balance due on maturity of March 31, 2003.  Certain proceeds received by the
Acquisition  Company would be required to repay and reduce the Revolving  Credit
Facility,  unless  otherwise  waived  by  the  lenders  and  the  Bank  Facility
Guarantors:  (1) 100% of excess cash flow obtained by the  Acquisition  Company;
(2) the first $25.0 million net proceeds of the lease or sale of MSAT-2 received
by the  Acquisition  Company,  and  thereafter  75% of  the  remaining  proceeds
received  from such  lease or sale (the  remaining  25% may be  retained  by the
Acquisition  Company for business  operations);  (3) 100% of the proceeds of any
other asset sales by the Acquisition Company; (4) 50% of the net proceeds of any
offerings of the Acquisition  Company's equity (the remaining 50% to be retained
by the Acquisition Company for business  operations);  and (5) 100% of any major
casualty  proceeds.  At such time as the Revolving  Credit Facility is repaid in
full, and subject to satisfaction of the restrictive  payments provisions of the
Notes, any prepayment  amounts that would otherwise have been used to prepay the
Revolving Credit Facility will be dividended to the Company.


                                      F-10





The Term Loan Facility

The Term Loan Facility  bears an interest  rate,  generally,  of 50 basis points
above  LIBOR and is  secured  by the  assets  of the  Company,  principally  its
stockholdings in AMRC and the Acquisition  Company. The Term Loan Agreement does
not include any scheduled  amortization until maturity, but does contain certain
provisions for  prepayment  based on certain  proceeds  received by the Company,
unless otherwise waived by the Banks and the Bank Facility Guarantors:  (1) 100%
of excess cash flow  obtained by the  Company;  (2) the first $25.0  million net
proceeds of the lease or sale of MSAT-2 received by the Company,  and thereafter
75% of the remaining  proceeds  received from such lease or sale (the  remaining
25% to be retained by the Acquisition Company for business operations); (3) 100%
of the  proceeds  of any other asset  sales by the  Company;  (4) 50% of the net
proceeds  of any  equity  offerings  of the  Company  (the  remaining  50% to be
retained  by the  Company for  business  operations);  and (5) 100% of any major
casualty  proceeds of the Company.  To the extent that the Term Loan Facility is
repaid, the aforementioned proceeds that would otherwise have been used to repay
the Term Loan Facility will be used to repay and reduce the commitment under the
Revolving Credit Facility.


The Guarantees

In connection  with the New Bank  Financing,  the Bank Facility  Guarantors have
agreed  to  extend  separate  guarantees  of  the  obligations  of  each  of the
Acquisition  Company  and the  Company  to the Banks,  which on a several  basis
aggregate  to $200  million.  In their  agreement  with each of the  Acquisition
Company and the Company (the "Guarantee Issuance Agreement"),  the Bank Facility
Guarantors  have  agreed to make  their  guarantees  available  for the New Bank
Financing.  The Guarantee  Issuance  Agreement will include  certain  additional
agreements of the Acquisition  Company and of the Company including with respect
to financial  performance of the  Acquisition  Company  relating to the ratio of
debt to EBITDA and service  revenue,  which,  if not met,  could, if not waived,
limit the Acquisition Company's ability to draw down on additional amounts under
the  Revolving  Credit  Facility  and  result  in a  default  under the New Bank
Financing  beginning in 1999. In exchange for the additional risks undertaken by
the Bank  Facility  Guarantors in connection  with the New Bank  Financing,  the
Company has agreed to compensate  the Bank Facility  Guarantors,  principally in
the form of 1 million  additional  warrants  and  repricing  and  extending  the
expiration date of 5.5 million warrants  previously issued  (together,  the "New
Guarantee  Warrants").  The New  Guarantee  Warrants will be on the same pricing
terms as those issued as part of the Units.  The Bank Facility  Guarantors  will
have  certain  demand and  piggy-back  registration  rights  with  regard to the
unregistered  shares of the Company's Common Stock held by them or issuable upon
exercise of the Guarantee Warrants.

Further,  in connection with the Guarantee Issuance  Agreement,  the Company has
agreed  to  reimburse  the  Bank  Facility  Guarantors  in the  event  that  the
Guarantors  are required to make payment  under the  Revolving  Credit  Facility


                                      F-11




guarantees,  and, in connection with this Reimbursement  Commitment has provided
the Bank  Facility  Guarantors a junior  security  interest  with respect to the
assets of the Company, principally its stockholdings in AMRC and the Acquisition
Company.




Motorola Vendor Financing

Motorola has agreed to provide the Acquisition  Company with up to $10.0 million
of vendor financing (the "Vendor Financing Commitment"), which will be available
to finance up to 75% of the purchase price of additional  network base stations.
Loans under this  facility will bear interest at a rate equal to LIBOR plus 7.0%
and will be  guaranteed by the Company and each  subsidiary  of the  Acquisition
Company.  The terms of such  facility  will  require  that  amounts  borrowed be
secured by the  equipment  purchased  therewith.  This  commitment is subject to
customary  conditions,  including due  diligence,  and there can be no assurance
that the facility will be obtained by the Acquisition  Company on these terms or
at all.

Summary of Recent Financing

The Company believes the proceeds from the issuance of the Notes,  together with
the borrowings under the New Bank Financing and the Vendor Financing Commitment,
will be sufficient to pay the cash portion of the Acquisition and fund operating
losses,  capital  expenditures,  working  capital,  and scheduled  principal and
interest  payments on debt through the time when the Company expects to generate
positive  free  cash flow  (operating  cash  flow  less  capital  expenditures);
however,  there  can be no  assurance  that the  Company's  current  projections
regarding the timing of its ability to achieve positive operating cash flow will
be  accurate,  and that the Company  will not need  additional  financing in the
future. See "Overview."

At December 31,  1997,  the Company had  remaining  contractual  commitments  to
purchase both mobile data  terminal  inventory  and mobile  telephone  inventory
approximating  $6.3  million.  (See  Note  10  to  the  consolidated   financial
statements).

All wholly owned subsidiaries of the Company are subject to financing agreements
that limit the amount of cash  dividends  and loans that can be  advanced to the
Company.  At  December  31,  1997,  all of these  subsidiaries'  net assets were
restricted under these  agreements.  These  restrictions  will have an impact on
American Mobile's ability to pay dividends.

Cash used in operating  activities was $50.9 million for 1997 compared to $113.6
million  for  1996.  The  decrease  in cash  used in  operating  activities  was
primarily  attributable to (i) decreased  operating  losses,  and (ii) decreased
inventory and accounts receivable  balances.  Cash used by investing  activities
was $10.2 million for 1997 compared to cash provided by investing  activities of
$50.9  million in 1996.  The $61.1  decrease was primarily  attributable  to the
proceeds in the amount of $66.0  million from the  settlement  of the  Company's
claims under its satellite insurance contracts and policies, offset by a general


                                      F-12




reduction in capital  expenditures.  Cash provided by financing  activities  was
$61.1 million in 1997 compared to cash used of $56.0 million in 1996, reflecting
the proceeds from the Bank Financing,  offset by the repayment of certain vendor
financing and other  long-term  debt.  Proceeds from the sale of debt securities
and Common Stock were $284,000 and $2.9 million for 1997 and 1996, respectively.
Payments  on  long-term  debt and  capital  leases  were $8.8  million and $63.2
million for 1997 and 1996, respectively. In addition, the Company incurred $10.8
million  of debt  issuance  costs  associated  with  the  placement  of the Bank
Financing in 1996, as compared to $1.5 million in 1997. As of December 31, 1997,
the Company had $2.1 million of cash and cash equivalents and working capital of
$5.3 million.


Regulation

The ownership and operations of the Company's  communication systems are subject
to significant  regulation by the FCC, which acts under authority granted by the
Communications Act of 1934, as amended (the  "Communications  Act"), and related
federal laws. A number of the  Company's  licenses are subject to renewal by the
FCC and,  with respect to the  Company's  satellite  operations,  are subject to
international  frequency  coordination.  In  addition,  current FCC  regulations
generally  limit the  ownership  and  control  of  American  Mobile by  non-U.S.
citizens  or  entities  to 25%.  There can be no  assurances  that the rules and
regulations  of the FCC will  continue to support the  Company's  operations  as
presently  conducted and contemplated to be conducted in the future, or that all
existing  licenses will be renewed and requisite  frequencies  coordinated.  See
"Part I, Item 1. Business - Regulation".

On June 5, 1996,  the FCC  granted  ARDIS  extensions  of time to  complete  the
buildouts  of 190 antenna  sites,  as required  to maintain  previously  granted
licenses.  As of March 25,  1998,  approximately  104 of the sites  remain to be
constructed  by  expiration  dates that range between June 27, 1998 to March 31,
1999. Management estimates that $5.2 million will be necessary to achieve timely
buildouts of the network, including $5.0 million in 1998. Failure to obtain such
capital or to complete the  buildouts in a timely manner could result in loss of
licenses  for  such  sites  from  the  FCC,  loss of  customers,  as well as the
incurrence of penalties under a customer  contract,  which would have a material
adverse effect on the Company.


Other Matters

As previously  reported,  the satellite  has, in the past,  experienced  certain
technological  anomalies,  most  significantly  with respect to its eastern beam
which resulted in the Company's  receipt of $66.0 million of insurance  proceeds
as discussed  above (see  "Liquidity  and Capital  Resources").  There can be no
assurance that the satellite will not experience subsequent anomalies that could
adversely impact the Company's  financial  condition,  results of operations and
cash flows. See "Part I, Item 1. Business-Satellite Back-up and Technology".


                                      F-13





Regarding the year 2000 compliance  issue for information  systems,  the Company
has  recognized  the need to ensure that its computer  operations  and operating
systems will not be adversely affected by the upcoming calender year 2000 and is
cognizant of the time sensitive nature of the problem.  The Company has assessed
how  it  may  be  impacted  by  year  2000  and  has  formulated  and  commenced
implementation of a comprehensive plan to address known issues as they relate to
its  information  systems.  The plan,  as it  relates  to  information  systems,
includes a combination of  modification,  upgrade and  replacement.  The Company
estimates that the cost of year 2000 compliance for its information systems will
not have a material  adverse  affect on the future  consolidated  results of the
operations  of the Company.  The Company is not yet able to estimate the cost of
year 2000 compliance with respect to third party suppliers;  however, based on a
preliminary  review,  management  does not  expect  that such  costs will have a
material  adverse  effect  on the  Company's  financial  condition,  results  of
operations and cash flow.


Accounting Standards

In  March  1997,  the  Financial  Accounting  Standards  Board  ("FASB")  issued
Statement of Financial  Accounting  Standards  ("SFAS") No. 128,  "Earnings  per
Share." This  Statement  governs the  calculation of Earnings per Share ("EPS"),
and requires that EPS  calculations be presented as Basic Earnings per Share and
Diluted Earnings per Share. The impact of adopting the Statement is not material
to the financial statements.

In June 1997,  the FASB issued SFAS No. 130,  "Reporting  Comprehensive  Income"
governing the reporting and display of comprehensive  income and its components,
and SFAS No.  131,  "Disclosures  about  Segments of an  Enterprise  and Related
Information"  requiring that public  businesses report financial and descriptive
information  about  its  reportable  operating  segments.  Both  Statements  are
applicable to reporting periods beginning after December 15, 1997. The impact of
adopting  the  Statements  is not  expected  to be  material  to  the  financial
statements.



                                      F-14






   Report of Independent Public Accountants


To American Mobile Satellite Corporation:

We have audited the accompanying  consolidated balance sheets of American Mobile
Satellite  Corporation (a Delaware  corporation) and Subsidiaries as of December
31,  1997  and  1996,   and  the  related   consolidated   statements  of  loss,
stockholders'  equity and cash  flows for each of the three  years in the period
ended December 31, 1997. These financial  statements are the  responsibility  of
the Company's  management.  Our responsibility is to express an opinion on these
financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards  require that we plan and perform an audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosure in the financial  statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material  respects,  the  financial  position of American  Mobile  Satellite
Corporation  and  Subsidiaries as of December 31, 1997 and 1996, and the results
of their  operations  and their  cash  flows for each of the three  years in the
period ended December 31, 1997, in conformity with generally accepted accounting
principles.



/s/Arthur Andersen LLP

Washington, D.C.
March 31, 1998


                                      F-15





American Mobile Satellite Corporation and Subsidiaries

Consolidated  Statements of Loss  (dollars in thousands,  except per share data)
for the years ended December 31, 1997, 1996, and 1995





                                                    Years Ended December 31
                                           ----------------------------------------------

                                                                           
                                                     1997             1996            1995

REVENUES
 Services                                           $20,684          $9,201          $6,873
 Sales of equipment                                  23,530          18,529           1,924
                                                     ------          ------          ------

 Total Revenues                                      44,214          27,730           8,797

COSTS AND EXPENSES:
 Cost of service and operations                      31,959          30,471          23,948
 Cost of equipment sold                              40,335          31,903           4,676
 Sales and advertising                               12,066          24,541          22,775
 General and administrative                          14,819          17,464          16,681
 Depreciation and amortization                       42,430          43,390          11,218
                                                     ------          ------          ------

 Operating Loss                                     (97,395)       (120,039)        (70,501)

INTEREST EXPENSE                                    (21,633)        (15,151)           (916)
INTEREST AND OTHER  INCOME                            1,122             552           4,500 
EQUITY IN LOSS OF AMRC                               (1,301)             --              --
                                                    --------        --------           -----

NET LOSS                                          ($119,207)      ($134,638)       ($66,917)
                                                  ==========      ==========       =========

BASIC AND DILUTED LOSS PER SHARE OF COMMON STOCK     ($4.74)         ($5.38)         ($2.69)



WEIGHTED-AVERAGE COMMON SHARES
 OUTSTANDING DURING THE PERIOD (000's)               25,131          25,041          24,900




The  accompanying  notes are an integral  part of these  consolidated  financial
statements.




                                      F-16




American Mobile Satellite Corporation and Subsidiaries

Consolidated Balance Sheets (dollars in thousands,  except per share data) as of
December 31, 1997 and 1996


                                                                                             
ASSETS                                                                         1997                1996
                                                                               ----                ----
CURRENT ASSETS:
  Cash and cash equivalents                                                   $2,106              $2,182
  Inventory                                                                   40,321              38,034
  Prepaid in-orbit insurance                                                   4,564               5,080
  Accounts receivable-trade, net of allowance for doubtful accounts            8,140               6,603
     of $1,930 in 1997 and $1,548 in 1996
  Other current assets                                                         9,608              14,247
                                                                              ------              ------
  Total current assets                                                        64,739              66,146

PROPERTY AND EQUIPMENT IN SERVICE - NET
  (gross balances include $135,586 and $134,737 purchased from
        related parties through 1997 and 1996 respectively)                  233,174             267,863

DEFERRED CHARGES AND OTHER ASSETS:
  (net of accumulated amortization of $14,096 in 1997 and 
     $10,597 in 1996)
  (gross balances include $3,000 paid to related parties in 1996)             13,534              16,164
                                                                             -------              ------

  Total assets                                                              $311,447            $350,173
  ------------                                                              ========            ========

LIABILITIES AND STOCKHOLDERS' EQUITY

CURRENT LIABILITIES:
  Accounts payable and accrued expenses                                      $35,861             $42,625
  Obligations under capital leases due within one year                           798               3,931
  Current portion of long-term debt                                           15,254              11,113
  Other current liabilities                                                    7,520                  --
                                                                             -------             -------

  Total current liabilities                                                   59,433              57,669

LONG-TERM LIABILITIES:
  Obligations under Bank Financing                                           198,000             127,000
  Capital lease obligations                                                    3,147               2,557
  Net assets acquired in excess of purchase price (Note 12)                    2,725               3,395
  Other long-term debt                                                         1,364                  --
  Other long-term liabilities                                                    647                 852
                                                                               -----                 ---

  Total long-term liabilities                                                205,883             133,804
                                                                             -------             -------

  Total liabilities                                                          265,316             191,473

COMMITMENTS (Note 9 and 10)

STOCKHOLDERS' EQUITY:
 Preferred Stock, par value $0.01: authorized 200,000 shares;
     no shares issued                                                             --                  --
 Common Stock, voting, par value $0.01: authorized 75,000,000 shares;
     25,159,311 shares issued and outstanding in 1997; 25,097,577 shares
     issued and outstanding in 1996                                              252                 251
 Additional paid-in capital                                                  451,892             451,259
 Common Stock purchase warrants                                               36,338              23,848
 Unamortized guarantee warrants                                              (23,586)            (17,100)
 Retained loss                                                              (418,765)           (299,558)
                                                                            ---------           ---------
 Total stockholders' equity                                                   46,131             158,700
                                                                              ------             -------

 Total liabilities and stockholders' equity                                 $311,447            $350,173
 ------------------------------------------                                 ========            ========

The  accompanying  notes are an integral  part of these  consolidated  financial
statements.


                                      F-17






American Mobile Satellite Corporation and Subsidiaries

Consolidated  Statements of Stockholders'  Equity (dollars in thousands,  except
per share data) for the period from January 1, 1995 through December 31, 1997


                                                Common Stock    Additional     Common Stock Unamortized
                                                   Shares      Par   Paid-in     Purchase    Guarantee  Retained
                                                              Value  Capital     Warrants     Warrants     Loss      Total
                                                                                                  
- ------

BALANCE, December 31, 1994                      24,798,755   $248   $445,859     $3,440         --     ($98,003)  $351,544
 Common Stock issued in January under         
  Stock Purchase Plan                                8,707     --         94         --         --         --           94
 Common Stock issued in April pursuant 
  to Launch Services Contract                       81,909      1      1,719         --         --         --        1,720
 Common Stock issued throughout the year 
  for exercise of stock options and award           32,026      1        518         --         --         --          519
  of bonus stock
 Common Stock issued in July under Stock            22,170     --        238         --         --         --          238
  Purchase Plan
 Common Stock issued in March, June, 
  September and December under the 401(k)   
  Savings Plan                                      17,563     --        329         --         --         --          329
 Net Loss                                               --     --         --         --         --      (66,917)   (66,917)
                                                ----------    ---    -------      -----      -----    ---------    --------
BALANCE, December 31, 1995                      24,961,130    250    448,757      3,440         --     (164,920)   287,527

 Common Stock issued in January under 
  Stock Purchase Plan                               13,432     --        294         --         --         --          294
 Common Stock purchase warrants issued
  in January for Bridge Financing                       --     --         --      2,253         --         --        2,253
 Common Stock issued for exercise of   
  stock options and award of bonus stock            37,320     --        612         --         --         --          612
 Common Stock issued upon exercise of Warrants      37,500      1        844       (845)        --         --           --
 Common Stock purchase warrants issued in               --     --         --     19,000    (19,000)        --           --
   July for Bank Financing 
 Amortization of guarantee warrants                     --     --         --         --      1,900         --        1,900
 Common Stock issued in July under Stock            25,934     --        341         --         --         --          341
  Purchase Plan
 Common Stock issued in March, June, 
  September and December under the 401(k)
  Savings Plan                                      22,261     --        411         --         --         --          411
 Net Loss                                               --     --         --         --         --     (134,638)  (134,638)
                                                ----------    ---    -------      -----      -----    ---------   ---------
BALANCE, December 31, 1996                      25,097,577    251    451,259     23,848    (17,100)    (299,558)   158,700

 Common stock issued in March, June,         
  September, October, and December under 
  the 401K Saving Plan                              31,684       1       349         --         --         --          350
 Common stock issued in January and 
  July under the Stock Purchase Plan                29,930      --       283         --         --         --          283
 Common Stock issued throughout award 
  of bonus stock                                       120      --         1         --         --         --            1
 Stock Purchase Warrants Revaluation                    --      --        --     12,490    (12,490)        --           --
 Amortization of Stock Purchase  
  Warrants                                              --      --        --         --      6,004         --        6,004
 Net Loss                                               --      --        --         --         --     (119,207)  (119,207)
                                                ----------     ---   -------      -----      -----    ---------   ---------
BALANCE, December 31, 1997                      25,159,311    $252  $451,892    $36,338   ($23,586)   ($418,765)   $46,131
                                                ==========    ====  ========    =======   =========   ==========   =======




The  accompanying  notes are an integral  part of these  consolidated  financial
statements.



                                      F-18



American Mobile Satellite Corporation and Subsidiaries

Consolidated Statements of Cash Flows (dollars in thousands) for the years ended
December 31, 1997, 1996, and 1995

                                                                                         Years Ended December 31
                                                                                    ----------------------------------

                                                                                       1997        1996        1995
                                                                                       ----        ----        ----

CASH FLOWS FROM OPERATING ACTIVITIES:
                                                                                                    
Net loss                                                                            ($119,207)  ($134,638)   ($66,917)
Adjustments to reconcile net loss to net cash used in operating activities:
   Amortization of guarantee warrants, debt discount, and debt issuance costs           9,350       5,721          --
   Depreciation and amortization                                                       42,430      43,307      11,218
   Equity in loss from AMRC                                                             1,301          --          --
   Changes in assets and liabilities:
     Inventory                                                                         (2,287)    (27,482)    (10,438)
     Prepaid in-orbit insurance                                                           516        (257)     (4,823)
     Trade accounts receivable                                                         (1,537)     (5,229)        218
     Other current assets                                                               4,639       1,970      (4,230)
     Accounts payable and accrued expenses                                             (5,820)      1,672      23,414
     Deferred trade payables                                                           11,685          --          --
     Deferred items - net                                                               8,038       1,347      (1,730)
                                                                                      --------   ---------    --------
Net cash used in operating activities                                                 (50,892)   (113,589)    (53,288)

CASH FLOWS FROM INVESTING ACTIVITIES:
Insurance proceeds applied to equipment                                                    --      66,000          --
Additions to property and equipment                                                    (8,598)    (14,054)    (83,776)
Proceeds from sales of short-term investments                                              --          --      28,717
Deferred charges and other assets                                                          --      (1,000)       (169)
Investment in AMRC                                                                     (1,643)         --          --
                                                                                       -------     ------     --------
Net cash provided by (used in) investing activities                                   (10,241)     50,946     (55,228)

CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of Common Stock                                                    284       1,247       2,569
Principal payments under capital leases                                                (2,576)     (3,994)       (538)
Proceeds from short-term borrowings                                                        --      70,000          --
Payments on short-term borrowings                                                          --     (70,000)         --
Proceeds from Bank Financing                                                           71,000     127,000          --
Proceeds from debt issuance                                                                --       1,700       7,630
Payments on long-term debt                                                             (6,180)    (59,190)    (28,486)
Debt issuance costs                                                                    (1,471)    (10,803)     (1,081)
                                                                                       -------    -------     --------
Net cash provided by (used in) financing activities                                    61,057      55,960     (19,906)


Net decrease in cash and cash equivalents                                                 (76)     (6,683)   (128,422)

CASH AND CASH EQUIVALENTS, beginning of period                                          2,182       8,865     137,287
                                                                                       ------     -------   ---------

CASH AND CASH EQUIVALENTS, end of period                                               $2,106      $2,182      $8,865
                                                                                       ======      ======      ======
Supplemental Cash Flow Information 
     Interest Payments                                                                $11,785      $8,293      $5,574



The  accompanying  notes are an integral  part of these  consolidated  financial
statements.


                                      F-19






AMERICAN MOBILE SATELLITE CORPORATION AND SUBSIDIARIES

Notes to Consolidated Financial Statements
as of December 31, 1997, 1996 and 1995


1. ORGANIZATION, BUSINESS AND LIQUIDITY

American Mobile Satellite Corporation (with its subsidiaries,  "American Mobile"
or the  "Company")  was  incorporated  on May 3, 1988,  by eight of the  initial
applicants for the mobile satellite services license,  following a determination
by the Federal Communications  Commission ("FCC") that the public interest would
be best served by granting the license to a consortium of all willing, qualified
applicants.  The FCC has authorized  American Mobile to construct,  launch,  and
operate a mobile satellite services system (the "Satellite Network ") to provide
a full range of mobile voice and data  services via  satellite to land,  air and
sea-based  customers  in a service area  consisting  of the  continental  United
States,  Alaska,  Hawaii,  Puerto Rico, the U.S.  Virgin Islands,  U.S.  coastal
waters,  international  waters and airspace and any foreign  territory where the
local  government  has  authorized  the  provision  of  service.  In March 1991,
American Mobile Satellite Corporation  transferred the mobile satellite services
license ("MSS license") to a wholly owned subsidiary, American Mobile Subsidiary
Corporation  ("AMSC  Subsidiary").  On April 7, 1995,  the Company  successfully
launched its first satellite ("MSAT-2"), from Cape Canaveral, Florida.

In late  1996,  the  Company  expanded  its mobile  data  business  through  the
acquisition  of  Rockwell  International  Corporation's  ("Rockwell")  dual mode
mobile  messaging and global  positioning and monitoring  service for commercial
trucking  fleets.  Rockwell was a private network  customer of the Company which
had purchased capacity from the Company on MSAT-2. See Note 12.

On December 31, 1997, the Company  entered into a Stock Purchase  Agreement (the
"Purchase Agreement") with Motorola, Inc. ("Motorola"), for the acquisition (the
"Acquisition") of ARDIS Company ("ARDIS"), a wholly-owned subsidiary of Motorola
that owns and operates a two-way wireless data communications  network.  Subject
to certain purchase price adjustment provisions,  the Company will acquire ARDIS
for a purchase  price of $50  million in cash and $50  million in the  Company's
Common Stock and  warrants  (the  "Purchase  Price").  The Company,  through the
acquisition  of ARDIS,  intends  to create a  nationwide  provider  of  wireless
communications services, including data, dispatch, and voice services, primarily
to business customers in the United States. See Note 15.

On October 16, 1997,  American Mobile Radio Corporation,  an indirect subsidiary
of American  Mobile through its subsidiary  AMRC Holdings,  Inc.  (together with
American Mobile Radio Corporation,  "AMRC"), was awarded a license by the FCC to
provide  satellite-based  Digital Audio Radio Service  ("DARS")  throughout  the
United States, following its successful $89.9 million bid at auction on April 2,



                                      F-20



1997.  American  Mobile has entered  into an  agreement  with  WorldSpace,  Inc.
("WorldSpace"),  by which  WorldSpace has acquired a 20%  participation in AMRC,
which can dilute the Company's  interest in AMRC to 28%. In connection  with the
DARS  auction,  AMRC has also  arranged for financing of the FCC license fees as
well as for initial  working  capital  needs,  which  financing has included the
issuance of  options.  AMRC has and will  continue  to receive  funding for this
business from an independent  source in exchange for debt and an equity interest
in AMRC.  Accordingly,  it is not expected that the development of this business
will have a material  impact on the  Company's  financial  position,  results of
operations, or cash flows. See Note 2.

                                      F-21






American Mobile is devoting its efforts to expanding a developing business. This
effort involves  substantial risk,  including  successfully  integrating  ARDIS.
Specifically,  future operating results will be subject to significant business,
economic,    regulatory,    technical,   and   competitive   uncertainties   and
contingencies. Depending on their extent and timing, these factors, individually
or in the  aggregate,  could have an adverse  effect on the Company's  financial
condition and future results of operations.


Liquidity and Financing Requirements

Adequate  liquidity  and capital  are  critical to the ability of the Company to
continue  as a  going  concern  and  to  fund  subscriber  acquisition  programs
necessary to reach cash positive and profitable operations.  The Company expects
to continue to make  significant  capital outlays for the foreseeable  future to
fund interest  expense,  capital  expenditures  and working capital prior to the
time that it begins to generate  positive cash flow from  operations and for the
foreseeable future thereafter.  To fund its operations through the first quarter
of 1998, the Company (i) borrowed all remaining amounts available under the Bank
Financing,  (ii) entered into a $10 million  Bridge Loan  Agreement (the "Bridge
Loan") with Hughes Communications Satellite Services, Inc. ("Hughes"), and (iii)
arranged the financing of $11.7 million of deferred trade payables. See Note 7.

The Company  currently  believes that the net proceeds from the sale of the $335
million  in Notes and  warrants,  together  with the  borrowings  under the $200
million New Bank Financing,  the Motorola  financing,  and the proceeds from the
Satellite Lease  Agreement (all discussed  below) will be sufficient to meet the
Company's currently anticipated capital expenditures,  operating losses, working
capital and debt service requirements  through 1998 and beyond.  However, if the
Company's cash flows from  operations are less than  projected,  the Company may
not meet its  financial  performance  agreements  under  the  Guaranty  Issuance
Agreement and, if such  conditions are not met or waived,  the Company would not
have access to additional funds under the Revolving  Credit  Facility.  See Note
15. In addition, even in the event that the Company has access to such funds, it
may  require  additional  debt or equity  financing  in  amounts  that  could be
substantial.  The type,  timing and terms of  financing  selected by the Company
will be dependent  upon the  Company's  cash needs,  the  availability  of other
financing sources and the prevailing conditions in the financial markets.  There
can be no  assurance  that any such  sources will be available to the Company at
any given time or as to the favorableness of the terms on which such sources may
be available.

In connection  with the ARDIS  Acquisition,  the Company  raised $335 million in
cash proceeds from the private issuance of units ("Units") consisting of 12 1/4%
Senior Notes  ("Notes") due 2008 and one warrant to purchase  3.75749  shares of
Common  Stock of the  Company  for each $1,000  principal  amount of Notes,  and
restructured its existing Bank Financing the "New Bank Financing"). The New Bank
Financing of $200 million  will  consist of a $100 million  unsecured  five-year
reducing  Revolving  Credit Facility  maturing March 31, 2003 and a $100 million



                                      F-22



five-year  Term Loan Facility with up to three  additional  one-year  extensions
subject to lender  approval.  Additionally,  Motorola  has agreed to provide the
Company  with up to $10  million  of vendor  financing  ("the  Vendor  Financing
Commitment"), which will be available to finance up to 75% of the purchase price
of additional base stations needed to meet ARDIS'  buildout  requirements  under
certain customer contracts. See Note 15.

On December 4, 1997, the Company entered into two simultaneous transactions. The
Company  agreed  with TMI to  acquire a  one-half  ownership  interest  in TMI's
satellite, MSAT-1, at a cost of $60 million payable in equal installments over a
five-year  period  (the  "Satellite  Purchase  Agreement");  certain  additional
payments  to TMI are  contemplated  in the event that  additional  benefits  are
realized by the Company.  Simultaneously,  the Company entered into an agreement
(the "Satellite Lease  Agreement") with African  Continental  Telecommunications
Ltd. ("ACTEL"), for the lease of MSAT-2, for deployment over sub-Saharan Africa.
The  five-year  lease  provides for aggregate  lease  payments to the Company of
$182.5 million.  The lease includes a renewal option through the end of the life
of MSAT-2.  Closing under the Satellite  Purchase  Agreement and Satellite Lease
Agreement  is  subject to a number of  conditions.  It is  anticipated  that the
closing under both leasing agreements will occur simultaneously in the spring of
1998.  See Note 10.


2. SIGNIFICANT ACCOUNTING POLICIES

Development Stage Company

Consistent  with  Statement of Financial  Accounting  Standards  ("SFAS") No. 7,
"Accounting and Reporting by Development Stage  Enterprises," the Company ceased
to be considered a development  stage company in the fourth quarter of 1996 with
the generation of significant revenue from its voice products and services.


Accounting Estimates

The preparation of financial  statements in conformity  with generally  accepted
accounting   principles  (GAAP)  requires   management  to  make  estimates  and
assumptions  that affect the reported  amount of assets and  liabilities  at the
date of the  financial  statements  and the  reported  amounts of  revenues  and
expenses  during the reporting  period.  Actual  results could differ from those
estimates.  The Company's most significant  estimates relate to the valuation of
inventory  and  committed  inventory  purchases  and the  allowance for doubtful
accounts receivable.


Consolidation

The consolidated  financial  statements  include the accounts of American Mobile
and  seven of its  wholly  owned  subsidiaries,  one of which is  inactive.  All
significant  inter-company  transactions and accounts have been  eliminated.  As
discussed in Note 1, AMRC, was awarded a license to provide  digital audio radio
service  ("DARS") and entered into an  agreement  with World Space, Inc. ("World



                                      F-23



Space"),  whereby World Space has acquired a 20%  participation in AMRC, and the
exercise of outstanding  issued options could reduce American Mobile's ownership
interest in AMRC to 28%.  Additionally,  the agreement gives WorldSpace  certain
participative  rights  which  provide  for their  participation  in  significant
business  decisions  that  would be made in the  ordinary  course  of  business;
therefore, in accordance with Emerging Issues Task Force ("EITF") No. 96-16, the
Company's investment in AMRC is carried on the equity method.

The following represents the unaudited summary financial  information of AMRC as
of December 31,1997. AMRC had no material activity prior to 1997.

  (In thousands)
  Current assets              $     --      Gross sales                $   --
  Noncurrent assets             91,901      Operating expense           1,110
  Current liabilities               --      Interest expense              518
  Noncurrent liabilities        84,387      Net loss                    1,628
  Total stockholders' equity     7,514





Cash and Cash Equivalents 

The Company considers highly liquid investments with remaining  maturities of 90
days or  less at the  time of  acquisition  to be cash  equivalents.  


Inventories

Inventories,  which consist primarily of finished goods, are stated at the lower
of cost or market.  Cost is determined  using the weighted  average cost method.
The Company  periodically  assesses the market value of its inventory,  based on
sales trends and  forecasts  and  technological  changes and records a charge to
current  period  income  when such  factors  indicate  that a  reduction  to net
realizable  value is appropriate.  For purposes of evaluating the net realizable
value of inventory,  management  considers  both inventory on hand and inventory
which it has committed to purchase.  During 1997 and 1996, the Company  recorded
charges  to Cost of  Equipment  Sold in the  amount of $12.0  million  and $11.1
million,  respectively,  related to the realizability of the Company's inventory
investment.


Fair Value of Financial Instruments

SFAS No. 107, "Disclosures about Fair Value of Financial  Instruments," requires
disclosures of the fair value of certain financial instruments.  For purposes of


                                      F-24




this disclosure, the fair value of a financial instrument is the amount at which
the  instrument  could be exchanged  in a current  transaction  between  willing
parties.  Cash and cash  equivalents,  trade  accounts  receivable  and accounts
payable approximate fair value because of the relatively short maturity of these
instruments. As a result of the Guarantees (see Note 7) associated with the Bank
Financing,  it is not  practicable  to estimate the fair value of this facility.
The fair value of other debt  approximates  carrying  value  because the related
debt has variable interest costs based on current market rates or are short-term
in nature.


Concentrations of Credit Risk

Financial instruments which potentially subject the Company to concentrations of
credit risk  consist  principally  of  temporary  cash  investments,  short-term
investments  and accounts  receivable.  The Company  places its  temporary  cash
investments  and short-term  investments in debt  securities  such as commercial
paper,  time  deposits,   certificates  of  deposit,  bankers  acceptances,  and
marketable  direct  obligations  of the United  States  Treasury.  The Company's
intent is to hold its investments in debt  securities to maturity.  To date, the
majority of the Company's business has been transacted with  telecommunications,
natural resources and transportation companies,  including maritime and trucking
companies located  throughout the United States. The Company grants credit based
on an  evaluation  of the  customer's  financial  condition,  generally  without
requiring  collateral  or  deposits.   Exposure  to  losses  on  trade  accounts
receivable,  for both service and for inventory sales, is principally  dependent
on each customer's financial condition.  The Company anticipates that its credit
risk with respect to trade accounts receivable in the future will continue to be
diversified  due to the large  number of  customers  expected  to  comprise  the
Company's base and their expected  dispersion  across many different  industries
and geographies.

Software Development Costs

The Company  capitalizes costs related to the development of certain software to
be used with its mobile  messaging  and position  location  service (the "Mobile
Data  Communications  Service") product.  The Company commenced  amortization of
these costs in the first  quarter of 1996.  These costs will be  amortized  over
three  years.  As of  December  31,  1997 and  1996,  net  capitalized  software
development  costs were $1.8  million and $3.6  million,  respectively,  and are
included in property and equipment in the accompanying balance sheets.


Deferred Charges and Other Assets

Other assets  primarily  consist of unamortized  financing  costs and debt issue
costs  associated with the existing vendor  financing  arrangements and the Bank
Financing.  The  Company  had $11.8  million  and $14.9  million of  unamortized
financing costs recorded at December 31, 1997 and 1996, respectively.  Financing
costs are  amortized  over the term of the related  facility  using the straight
line method, which approximates the effective interest method.




                                      F-25





Revenue Recognition

The Company  recognizes service revenue when  communications  services have been
rendered.  Equipment sales are recognized upon shipment of products and customer
acceptance, if required.


Research and Development Costs

Research and  development  costs are expensed as  incurred.  Such costs  include
internal  research  and  development  activities  and expenses  associated  with
external product development agreements.  The Company did not incur any research
and  development  cost for 1997,  and  incurred  approximately  $57,000 and $1.8
million for 1996 and 1995, respectively.


Advertising Costs

Advertising  costs are charged to  operations  in the year  incurred and totaled
$3.4 million,  $6.0  million,   and  $6.5  million  for  1997,  1996,  and  1995
respectively.

Stock Based Compensation

The Company  accounts for employee  stock options using the method of accounting
prescribed by APB Opinion No. 25,  "Accounting  for Stock Issued to  Employees."
Generally,  no expense is  recognized  related to the  Company's  stock  options
because the option's  exercise  price is set at the stock's fair market value on
the date the option is granted.  Effective  January 1, 1996, the Company adopted
SFAS No. 123 by making the required footnote disclosures (see Note 5).


Assessment of Asset Impairment

SFAS No.  121  "Accounting  for the  Impairment  of  Long-Lived  Assets  and for
Long-Lived  Assets to be Disposed of" requires that  impairment  losses for such
assets  be based  upon the fair  value of the  assets,  and was  adopted  by the
Company as the primary  basis by which the Company  measures  impairment  of the
Satellite Network and its related components. Adoption of this Statement has not
resulted in the  recording of a provision for  impairment of long-lived  assets,
but there can be no assurance that a material  provision for impairment will not
be required in the future.


Loss Per Share

In 1997,  the Company  adopted SFAS No. 128,  "Earnings Per Share." SFAS No. 128
requires dual  presentation of basic and diluted  earnings per share on the face
of the income  statement  for all periods  presented.  Basic  earnings per share
excludes  dilution  and is  computed  by  dividing  income  available  to common
stockholders by the weighted-average number of common shares outstanding for the
period.

                                      F-26





Diluted  earnings per share reflects the potential  dilution that could occur if
securities or other contracts to issued common stock were exercised or converted
into common stock.  Options and warrants to purchase shares of common stock were
not  included  in the  computation  of loss  per  share as the  effect  would be
antidilutive.  As a result, the basic and diluted earnings per share amounts are
identical.



3. STOCKHOLDERS' EQUITY

The Company has  authorized  200,000  shares of Preferred  Stock and  75,000,000
shares of  Common  Stock.  The par  value  per share is $0.01 for each  class of
stock.  For each share held,  Common  stockholders  are  entitled to one vote on
matters  submitted  to the  stockholders.  Cumulative  voting  applies  for  all
elections of directors of the Company.

The Preferred Stock may be issued in one or more series at the discretion of the
Board of Directors (the "Board"),  without  stockholder  approval.  The Board is
authorized   to  determine   the  number  of  shares  in  each  series  and  all
designations, rights, preferences, and limitations on the shares in each series,
including,  but not limited to, determining whether dividends will be cumulative
or non-cumulative.

Certain   controlling   stockholders   of  the  Company   have  entered  into  a
Stockholders'  Agreement (the "Agreement") which contains provisions relating to
the election of directors,  procedures for maintaining compliance with the FCC's
alien ownership  restrictions,  certain  restrictions on the transfer,  sale and
exchange  of Common  Stock,  and  procedures  for  appointing  directors  to the
Executive  Committee of the Board,  among  others.  The  Agreement  continues in
effect until  terminated by an affirmative  vote of holders of  three-fourths of
the  Company's  Common  Stock held by parties to the  Agreement.  Other  matters
relating  to the  Company's  governance  of the  Company  are set  forth  in the
Certificate of Incorporation and Bylaws.


As of  December  31,  1997,  the Company had  reserved  Common  Stock for future
issuance as detailed below.


Shares issuable upon exercise of warrants                              6,474,596
Amended and Restated Stock Option Plan for Employees                   3,429,326
Stock Option Plan for Non-Employee Directors                              50,000
Employee Stock Purchase Plan                                             190,137
Defined Contribution Plan                                                103,492
                                                                         -------
        Total                                                         10,247,551
                                                                      ==========


4. PROPERTY AND EQUIPMENT

Property and equipment is recorded at cost and depreciated  over its useful life
using the straight line method.  Assets recorded as capital leases are amortized
over the shorter of their useful lives or the term of the lease.

                                      F-27





The estimated  useful lives of office  furniture  and  equipment  vary from 2-10
years,  and the  Communications  Ground Segment  ("CGS") is  depreciated  over 8
years.

The Company is depreciating  the Space Segment over its estimated useful life of
10 years,  which was based on several factors,  including current conditions and
the estimated  remaining fuel of MSAT-2.  The original  estimated useful live is
periodically  reviewed  using current  Telemetry  Tracking and Control  ("TT&C")
data. To date, no significant  change in the original  estimated useful life has
resulted.  The  telecommunications  industry  is subject to rapid  technological
change  which may require the Company to revise the  estimated  useful  lives of
MSAT-2 and the CGS or to adjust  their  carrying  amounts.  The Company has also
capitalized  certain  costs to develop and implement  its  computerized  billing
system.  These costs are included in property and equipment and are  depreciated
over 8 years. Certain amounts from 1996 have been restated in the summary below.

The costs of constructing and putting satellites into service are capitalized in
the financial  statements and depreciated  over the estimated useful life of the
satellite. A total failure of the satellite from unsuccessful launches and/or in
orbit  anomalies  would result in a current  write-down of the satellite  value.
Partial  satellite  failures are recognized  currently to the extent such losses
are deemed  abnormal to the operation of the satellite.  A partial failure which
is deemed normal would not result in a loss of satellite capacity beyond what is
considered  normal  satellite  wear and tear and thus, a write down would not be
required.  Additionally,  all  future  incentive  arrangements  relating  to the
construction of satellites will be capitalized at launch.



Property and equipment consists of the following:

                                                               December 31
(in thousands)                                            1997            1996

Space Segment                                           $187,976        $187,386
Ground Segment                                           109,691         104,559
Office equipment and furniture                            19,305          16,684
Mobile Data Communications Service                        21,118          21,014
                                                          ------          ------
                                                         338,090         329,643
Less accumulated depreciation and amortization           104,916          61,780
                                                         -------          ------
Property and equipment, net                             $233,174        $267,863
                                                        ========        ========


5. STOCK OPTIONS

The Company has two active stock option  plans.  The American  Mobile  Satellite
Corporation  1989 Amended and  Restated  Stock  Option Plan for  Employees  (the
"Plan") permits the grant of non-statutory  options and the award of bonus stock


                                      F-28




up to a total of 3.5  million  shares of  Common  Stock.  Under  the  Plan,  the
exercise   price  and  vesting   schedule  for  options  is  determined  by  the
Compensation  Committee of the Board,  which was  established  to administer the
Plan. Generally, options vest over a three year period and will have an exercise
price not less than the fair  market  value of a share on the date the option is
granted  or have a term  greater  than ten years.  In March  1997,  the  Company
repriced  certain  employee stock options to $13.00 per share. No other terms of
the options were modified.

The  Company  also has a Stock  Option  Plan  for  Non-Employee  Directors  (the
"Director Plan") which provides for the grant of options up to a total of 50,000
shares of Common Stock.  Directors  receive an initial  option to purchase 1,000
shares of Common  Stock,  with annual  option  grants to purchase  500 shares of
Common Stock.  Options under the Director Plan can be exercised at a price equal
to the fair  market  value of the  stock on the date of the  grant and are fully
vested and  immediately  exercisable  on the date of grant.  Each  Director Plan
option  expires  on the  earlier of (i) ten years from the date of grant or (ii)
seven months after the Director's termination.

In January 1998,  the Board of Directors  granted  356,111  shares of restricted
stock to senior  management  for the first time.  These  grants  include  both a
three-year vesting schedule as well as specific corporate  performance  targets.
Unless waived by the Board of Directors,  failure to meet a required performance
target would prevent the vesting of the restricted shares.


Information regarding the Company's stock option plans is summarized below:




                                                                                                     Weighted Average
                                                                Available            Granted and     Option Price Per
                                                                for Grant            Outstanding          Share

                                                                                                    
Balance, December 31, 1994                                        349,878                407,776          $18.60
  Additional shares authorized for grant                           50,000                    ---            --
  Granted                                                        (275,480)               275,480           16.88
  Exercised and awarded                                                --                (32,026)          16.10
  Forfeited                                                        60,380                (60,380)          18.50
                                                                   ------                --------               
Balance, December 31, 1995                                        184,778                590,850           17.94
  Additional shares authorized for grant                        1,241,138                     --            --
  Granted                                                      (1,565,272)             1,565,272           18.37
  Exercised and awarded                                                --                (37,320)          16.41
  Forfeited and canceled                                          623,356               (623,356)          23.23
                                                                  -------               ---------          
Balance, December 31, 1996                                        484,000              1,495,446           16.22
  Additional shares authorized for grant                        1,500,000                     --            --
  Granted                                                      (1,292,443)             1,292,443           12.67
  Exercised and awarded                                                --                   (120)          10.28
  Forfeited                                                     1,104,828             (1,104,828)          17.15
                                                                ---------             -----------          
Balance, December 31, 1997                                      1,796,385              1,682,941          $13.08
                                                                =========             ===========





                                      F-29






Options Exercisable at December 31:

                           Options                 Average
                                                Exercise Price

                                                 
1997                       595,432                  $14.39
1996                       276,804                  $17.97
1995                       219,272                  $18.31
1994                       175,471                  $17.73


The  Company  accounts  for  stock  compensation  costs in  accordance  with the
provisions of Accounting  Principles Board Opinion No. 25, "Accounting for Stock
Issued to Employees." Had  compensation  cost been determined  based on the fair
value  at the  grant  dates  for  awards  under  the  Company's  stock  plans in
accordance  with SFAS No. 123,  the net loss would have been  increased  by $5.3
million  ($.21 per  share) and $2.3  million  ($.09 per share) in 1997 and 1996,
respectively.  As required by SFAS No. 123,  the fair value of each option grant
is estimated on the date of grant using the  Black-Scholes  option pricing model
with the following  assumptions for 1997 and 1996: no historical dividend yield;
an expected  life of 10 years;  historical  volatility of 65% in 1997 and 45% in
1996, 45% and a risk-free  rate of return ranging from 5.71% to 6.44%.  Exercise
prices for options outstanding as of December 31, 1997, are as follows:




                                 Options Outstanding                                          Options Exercisable
                            Number               Weighted                                  Number
                        Outstanding as            Average             Weighted        Exercisable as of       Weighted
      Range of         of December 31,           Remaining            Average           December 31,           Average
  Exercise Prices            1997            Contractual Life      Exercise Price           1997           Exercise Price

                                                                                                   
    9.06 - 12.00            471,500                 8.82                $11.45            132,160              $11.84
   12.50 - 12.81            476,585                 9.07                 12.74                --                 0.00
   13.00 - 13.00            549,808                 7.64                 13.00            278,224               13.00
   14.62 - 26.25            185,048                 5.47                 18.29            185,048               18.29
                            -------                                                       -------               
   $9.06 - $26.25         1,682,941                 8.14                $13.08            595,432              $14.39
                          =========                                                       =======



6. INCOME TAXES

The Company  accounts for income taxes under the liability method as required in
the Statement of Financial  Accounting Standards No. 109, "Accounting for Income
Taxes." Under the liability method, deferred income taxes are recognized for the
tax consequences of "temporary  differences" by applying  enacted  statutory tax
laws and rates  applicable to future years to differences  between the financial
statement carrying amounts and the tax bases of existing assets and liabilities.
Under  this  method,  the effect on  deferred  taxes of a change in tax rates is
recognized in income in the period that includes the enactment  date.  Potential
tax benefits,  related to net operating losses and temporary  differences,  have
been  recorded as an asset,  and a valuation  allowance  for the same amount has
been established. The Company has paid no income taxes since inception.

                                      F-30





The following is a summary of the Company's net deferred tax assets.



                                                                December 31

(in thousands)                                             1997             1996

                                                                         
Net Operating Loss for Income Tax Purposes               $217,918         $170,710
Deferred Taxes Related to Temporary Differences:
  Tangible asset bases, lives and depreciation methods    (65,898)         (64,889)
  Other                                                     8,700            6,229
                                                            -----            -----
Total deferred tax asset                                  160,720          112,050
Less valuation allowance                                 (160,720)        (112,050)
                                                         ---------        ---------
Net deferred tax asset                                   $     --         $     --
                                                         =========        =========


Significant  timing  differences  affecting  deferred  taxes  in 1997  were  the
treatment of costs  associated  with the Space Segment for  financial  reporting
purposes compared to tax purposes.  As of December 31, 1997, the Company had net
operating loss carryforwards  ("NOLs") of $542 million. The NOLs expire in years
2004 through 2012. These NOL carryforwards are subject to certain limitations if
there is determined  to be a  substantial  change in ownership as defined in the
Internal Revenue Code.


7. LONG-TERM DEBT


                                                   December 31
(in thousands)                                1997             1996

Bank Financing                              $198,000         $127,000
Deferred Payment Agreement                        --            5,180
Deferred Trade Payables                       11,685               --
Term Loan Agreement                            4,933            5,933
                                               -----            -----
                                             214,618          138,113
Less current maturities                       15,254           11,113
                                              ------           ------
Long-term debt                              $199,364         $127,000
                                            ========         ========

Bank Financing - Term Loan and Working Capital Facility

On  June  28,  1996,  established  a  $219  million  debt  facility  (the  "Bank
Financing"),  of which $200 million is available and fully guaranteed by certain
American  Mobile  shareholders.  As of December  31,  1997,  the Bank  Financing
consisted of: (i) a $144 million  five-year,  multi-draw term loan facility (the
"Term Loan Facility") with quarterly payments  commencing March 31, 1999 through
and including June 30, 2001, and (ii) a $56 million  five-year  revolving credit
facility  with a  bullet  maturity  on  June  30,  2001  (the  "Working  Capital
Facility").  Proceeds from the Bank  Financing  were used to repay the Company's
interim financing and to refinance short-term Vendor Financing, and will be used


                                      F-31




for general  working  capital  purposes.  As of March 20, 1998,  the Company had
drawn down $144.0  million of the Term Loan  Facility at annual  interest  rates
ranging from 6.025% to 6.0875% and $56.0 million of the Working Capital Facility
at annual interest rates ranging from 6.025% to 6.2125%.  The Company,  on March
27, 1997,  reached an agreement  with the  Guarantors  to eliminate all covenant
tests in exchange for additional warrants and a repricing of warrants previously
issued (together,  the "Guarantee Warrants").  As a result of the repricing, the
Guarantee  Warrants were revalued at $21.9 million,  effective March 27,1997 and
are being amortized over the remaining life of the guarantee. On March 31, 1998,
in connection with the  Acquisition,  the Bank Financing was  restructured.  See
Note 15.


Deferred Trade Payables

In the last quarter of 1997, the Company arranged the financing of certain trade
payables. As of December 31, 1997, $11.7 million of deferred trade payables were
outstanding at rates ranging from 6.23% to 14% and are generally  payable by the
end of 1998.


Bridge Loan

On  December  31,  1997,  the  Company  entered  into a Bridge  Loan with Hughes
Communications Satellite Services, Inc. ("Hughes") in the principal amount of up
to $10 million,  secured by a pledge of the Company's  interest in its 80%-owned
subsidiary, AMRC. The Bridge Loan bears an annual interest rate of 12% and has a
maturity date of March 31, 1999, and requires  mandatory  repayment in the event
net proceeds are received from any asset disposition, lease agreement, financing
or equity  transaction  of the  Company.  The Bridge  Loan was drawn in full and
subsequently  repaid in full on March 31,  1998,  with a portion of the proceeds
from the Notes.  No further  borrowing is available  under the Bridge Loan.  See
Note 15.


Term Loan Agreement

The Company  entered  into a Term Loan  Agreement  (the "Loan  Agreement")  with
Northern Telecom to finance the purchase of certain  equipment to be used in the
ground segment.  The Loan Agreement provided for principal borrowings up to $7.5
million plus $1.1 million for accrued  interest.  In September 1996, the Company
arranged to reduce the interest  rate from LIBOR plus 4.5% to a floating rate of
LIBOR  plus  2.5%  through  maturity  and to defer  amounts  due  under the Loan
Agreement  to1997.  In December 1997, the Loan Agreement was amended to increase
the interest rate to LIBOR plus 4.5%,  effective January 1, 1998, and to defer a
portion of principal payments until April 1, 1998. As of December 31, 1997, $4.9
million was outstanding at an annual interest rate of 8.156%.




                                      F-32





Deferred Payment Agreement

In 1992, the Company entered into a contract ("CGS Contract") with  Westinghouse
Electric  Corporation   ("Westinghouse")  pursuant  to  which  Westinghouse  was
responsible for designing and constructing the Ground Segment and developing the
final specification for mobile telephones.  In connection with the CGS Contract,
Westinghouse agreed to defer payment,  including interest thereon, under certain
terms and  conditions,  for the basic  purchase  price and for change orders and
options elected by the Company (the "Deferred Payment Agreement").  During 1997,
the remaining $5.2 million  obligation under the Deferred Payment  Agreement was
fully repaid.


Interest Costs

The Company  incurred  interest  costs of  approximately  $21.6  million,  $15.1
million,  and $5.6 million in 1997, 1996, and 1995,  respectively.  All interest
costs  incurred  through  September  30,  1995 were  capitalized  as part of the
Company's   construction   activities.   The   capitalization  of  interest  was
discontinued in the fourth quarter of 1995 when the Satellite Network was deemed
substantially  complete and ready for its intended use.  Interest cost paid, net
of amounts capitalized, was $ 327,000 in 1995.


Assets Pledged and Secured

All wholly owned subsidiaries of the Company are subject to financing agreements
that limit the amount of cash  dividends  and loans that can be  advanced to the
Company.  At  December  31,  1997,  all of the  subsidiaries'  net  assets  were
restricted under these  agreements.  These  restrictions  will have an impact on
American Mobile Satellite Corporation's ability to pay dividends.


Covenants

The debt agreements and related Guarantee Agreements entered into by the Company
contain various restrictions,  covenants, defaults, and requirements customarily
found in such financing agreements.  Among other restrictions,  these provisions
include  limitations on cash dividends,  restrictions  on  transactions  between
American  Mobile and its  subsidiaries,  restrictions  on capital  acquisitions,
material  adverse  change  clauses,   and  maintenance  of  specified  insurance
policies.


8. RELATED PARTIES

In 1990,  following a competitive bid process,  American Mobile signed contracts
with Hughes  Aircraft,  the parent  company of Hughes  Communications  Satellite
Services ("Hughes Communications"), an American Mobile stockholder, to construct
MSAT-2 (the "Satellite  Construction  Contract").  The contract  contains flight
performance  incentives  payable  by the  Company to Hughes  Aircraft  if MSAT-2
performs according to the contract.  The total incentives owed, if earned,  will


                                      F-33




be $7.1 million,  plus  interest,  with payment  amounts  otherwise due deferred
until second quarter 1998.  The costs of the  incentives are  capitalized in the
period  earned.  The Company  also in 1990  selected  HNS Ltd.,  an affiliate of
Hughes Aircraft, to design, manufacture, and implement the Company's Mobile Data
Communications  Service.  In 1991,  the Company  entered into an agreement  with
Hughes  Communications to provide assistance in the launch services  procurement
process  and  certain  other  management   services  through  the  launch  date.
Additionally,  in 1996,  Hughes  loaned the Company $10.0 million as part of its
participation  in the Interim  Financing.  On  December  31,  1997,  the Company
entered  into  a  Bridge  Loan   Agreement   (the  "Bridge  Loan")  with  Hughes
Communications in the principal amount of up to $10 million (see Note 7).

The Company has entered into various transactions and agreements with affiliates
of  AT&T  Wireless  Services,   Inc.  ("AT&T  Wireless"),   an  American  Mobile
stockholder.  The  arrangements  include the purchase of satellite  capacity and
equipment by AT&T, the purchase by American Mobile of certain  equipment for use
in the  Satellite  Network,  the leasing of certain  office  equipment,  and the
engagement  of  AT&T  to  be  one  of  the  Company's  long-distance  providers.
Additionally,  the Company sublet certain office space to AT&T Wireless  through
September  1996.  The  following  table  presents  a summary  of  related  party
transactions.




                                                                               Years Ended December 31
(in thousands)                                                            1997                1996                1995

                                                                                                       
Payments made to (from) related parties:
Additions to property under construction                               $    --             $    --              $3,029
Additions to property and equipment in service                             200               2,847                 265
Proceeds from debt issuance                                                 --             (10,000)                 --
Payments on debt obligations                                               292              20,926                 251
Payment for Guarantees                                                      --               3,000                  --
Operating expenses                                                       2,706               3,817               1,453
Satellite capacity/airtime revenue                                      (2,836)             (1,276)                 --
Sublease income                                                             --                (205)               (239)
Other                                                                       --                  --                (506)
                                                                       --------            --------             -------
Net payments to related parties                                        $   362             $19,109              $4,253
                                                                       ========            ========             =======
Due to (from) related parties:
Mobile Data Communications Service Financing                           $    --             $    --              $7,180
Capital leases                                                             249                 446                 631
Operating expenses                                                       1,209                 185                 708
Satellite capacity/airtime revenue                                        (495)               (416)                 --
Capital acquisitions                                                     2,120               1,584               1,924
                                                                         -----               -----               -----
Net amounts due to related parties                                     $ 3,083              $1,799             $10,443
                                                                       ========            ========            ========






                                      F-34





 9. LEASES

Capital Leases

The Company leases certain office  equipment and Ground Segment  equipment under
agreements accounted for as capital leases. Assets recorded as capital leases in
the accompanying balance sheets include the following:


                                                           December 31
(in thousands)                                         1997          1996

Ground Segment equipment                              $7,263        $7,263
Office equipment                                       4,033         4,088
Less accumulated amortization                          4,750         2,826
                                                       -----         -----
Total                                                 $6,546        $8,525
                                                      ======        ======      

Amortization of the Ground Segment equipment began with the commencement of full
commercial service in December 1995.

In January 1996, the Company  refinanced  certain computer  hardware  components
under a sale/leaseback arrangement.  The Company received proceeds in the amount
of $1.7 million.  The transaction was accounted for as a financing,  wherein the
property  remains on the books and  continues  to be  depreciated.  A  financing
obligation  representing  the proceeds  was  recorded,  and is reduced  based on
payments under the lease.  The  sale/leaseback  has a three-year  term and had a
balance of approximately $93,000 at December 31, 1997.


Operating Leases

The Company leases certain facilities and equipment under arrangements accounted
for as operating leases.  Certain of these  arrangements have renewal terms. The
office lease has an original  lease term of ten years  expiring in 2003,  with a
renewal option, and escalation clauses.  Total rent expense, under all operating
leases,  approximated  $2.9 million,  $2.5  million,  and $10.6 million in 1997,
1996, and 1995, respectively.



                                      F-35





At December  31,  1997,  minimum  future  lease  payments  under  noncancellable
operating and capital leases are as follows:


                                Operating            Capital
                                 Leases               Leases
(in thousands)
1998                             $2,188               $1,200
1999                              2,114                2,124
2000                              2,044                1,351
2001                              2,085                   --
2002                              2,131                   --
thereafter                        2,155                   --
- ----------                        -----                -----
Total                           $12,717               $4,675
                                =======               
Less: Interest                                           730
                                                       -----
                                                      $3,945
                                                      ======


10. OPERATING AGREEMENTS AND COMMITMENTS

Joint Operating and Satellite Capacity Agreements

On December 4, 1997, the Company entered into two simultaneous transactions. The
Company  agreed  with TMI to  acquire a  one-half  ownership  interest  in TMI's
satellite, MSAT-1, at a cost of $60 million payable in equal installments over a
five-year  period  (the  "Satellite  Purchase  Agreement");  certain  additional
payments  to TMI are  contemplated  in the event that  additional  benefits  are
realized  by the  Company.  Under  the  Satellite  Purchase  Agreement,  TMI and
American Mobile will each own a 50% undivided  ownership  interest in the Shared
Satellite,  will  jointly  be  responsible  for  the  operation  of  the  Shared
Satellite,  and  will  share  certain  satellite  operating  expenses,  but will
otherwise  maintain  their separate  business  operations.  Simultaneously,  the
Company entered into an agreement (the "Satellite Lease Agreement") with African
Continental  Telecommunications  Ltd.  ("ACTEL"),  for the lease of MSAT-2,  for
deployment over sub-Saharan  Africa.  The five-year lease provides for aggregate
lease  payments to the Company of $182.5  million.  The lease includes a renewal
option  through  the end of the life of  MSAT-2,  on the same  lease  terms,  at
ACTEL's  election  exercisable 2 1/2 years prior to the end of the initial lease
term.

Should the Satellite  Purchase  Agreement and Satellite  Lease  Agreement not be
consummated,  the  Company  and TMI will  remain  parties  to a Joint  Operating
Agreement and a Satellite  Capacity  Agreement  under which the parties agree to
provide,  among other  things,  emergency  backup and restoral  services to each
party  during  any  period in which the  other's  satellite  is not  functioning
properly.  Additionally,  each party will be entitled to lease  excess  capacity
from the other party's  satellite  under  specified  terms and  conditions.  The
implementation of these agreements requires regulatory  approvals by the FCC and


                                      F-36




Industry  Canada  (formerly  Canada's  Department of Industry and Science).  The
Company has  received,  and expects to continue to seek  approvals  contemplated
under these agreements on a timely basis.


Commitments

At December 31,  1997,  the Company had  remaining  contractual  commitments  to
purchase both mobile data  terminal  inventory  and mobile  telephone  inventory
approximating $6.3 million.

The aggregate fixed and  determinable  portion of all inventory  commitments and
obligations for other fixed contracts for the next five years is as follows.


(in thousands)

1998                                             $7,011
1999                                              1,802
2000                                                426
                                                    ---
Total                                            $9,239
                                                 ======

Additionally, the Company may enter into additional commitments that may require
the purchase of mobile  telephone and mobile terminal  inventory in amounts that
could be material to the Company's financial condition.

The Company entered an agreement with a vendor,  whereby the Company would incur
extra licensing fees, up to a total maximum potential of $4.1 million,  upon the
voice subscriber base reaching certain levels.  Management does not believe that
the subscriber levels outlined in the license will be met.



11. EMPLOYEE BENEFITS

Defined Contribution Plan

The Company sponsors a 401(k) defined  contribution plan ("401(k) Savings Plan")
in which all employees can  participate.  Effective  January 1, 1995, the 401(k)
Savings Plan provides for a Company match of employee contributions, in the form
of Common  Stock,  limited to the fair  market  value of up to  one-half  of the
employee's  contribution not to exceed 6% of an employee's salary. The Company's
matching expense was $350,000 for 1997, $411,000 for 1996 and $329,000 for 1995.






                                      F-37





Employee Stock Purchase Plan

In December 1993,  the Company  adopted the Employee Stock Purchase Plan ("Stock
Purchase Plan") to allow eligible  employees to purchase shares of the Company's
Common Stock at 85% of the lower of market value on the first and last  business
day of the six-month  option period.  An aggregate of 29,930,  39,366 and 30,877
shares of Common Stock were issued under the Stock Purchase Plan in 1997,  1996,
and 1995, respectively.


12.  BUSINESS ACQUISITION

On November 22, 1996, the Company acquired the assets of Rockwell Collins,  Inc.
("Rockwell")   relating   to  its   Land   Transportation   Electronics   Mobile
Communications   Satellite  Service  business  (the  "Business")  through  which
Rockwell had sold mobile messaging hardware and services to commercial  trucking
fleets.  The assets of the Business  were  acquired  from  Rockwell  through the
assumption by the Company of the various  contracts and  obligations of Rockwell
relating to the Business;  no additional  direct payments were made or are to be
made under the terms of the Asset Sale Agreement, dated as of November 22, 1996.
The assets of the business  acquired from Rockwell include  tangible  equipment,
completed  inventory  and future  inventory  deliveries to be used in connection
with fulfilling the contracts transferred with the Business. The Company intends
to continue such use in operating the Business.

The purchase  method of  accounting  for  business  combinations  was used.  The
operating   results  of  the  Business  have  been  included  in  the  Company's
consolidated   statements  of  loss  from  the  date  of  acquisition  and  were
insignificant  in 1996.  The fair value of the assets  acquired was $9.5 million
and liabilities assumed totaled $6.1 million.  The fair value of assets acquired
in excess of purchase  price arising from the  acquisition in the amount of $3.4
million is being  amortized  over five years on a straight  line  basis.  Assets
acquired included inventory  deliveries,  fixed assets, and other  miscellaneous
items.

The pro forma results below (unaudited)  assume the acquisition  occurred at the
beginning of the year ended December 31, 1996 (dollars in thousands,  except per
share data).


                                            1996

Revenue                                   $33,333
Net Loss                                 (148,434)
Loss per share                              (5.93)





                                      F-38





13. LEGAL AND REGULATORY AND OTHER MATTERS

Legal and Regulatory Matters

Like other mobile  service  providers in the  telecommunications  industry,  the
Company is subject to substantial domestic, foreign and international regulation
including the need for regulatory  approvals to operate and expand the Satellite
Network and operate and modify subscriber equipment.

The  successful  operation of the Satellite  Network is dependent on a number of
factors,  including the amount of L-band  spectrum made available to the Company
pursuant  to  an  international  coordination  process.  The  United  States  is
currently  engaged in an  international  process of  coordinating  the Company's
access to the  spectrum  that the FCC has  assigned  to the  Company.  While the
Company  believes that  substantial  progress has been made in the  coordination
process and expects that the United  States  government  will be  successful  in
securing the necessary spectrum,  the process is not yet complete. The inability
of the United States  government  to secure  sufficient  spectrum  could have an
adverse effect on the Company's  financial  position,  results of operations and
cash flows.

The Company has the necessary regulatory  approvals,  some of which are pursuant
to  special  temporary  authority,  to  continue  its  operations  as  currently
contemplated.  The  Company has filed  applications  with the FCC and expects to
file applications in the future with respect to the continued operations, change
in  operation  and  expansion  of the Network and  certain  types of  subscriber
equipment.  Certain of its  applications  pertaining to future service have been
opposed.  While the Company, for various reasons,  believes that it will receive
the necessary  approvals on a timely basis,  there can be no assurance  that the
requests  will be granted,  will be granted on a timely basis or will be granted
on  conditions  favorable  to  the  Company.  Any  significant  changes  to  the
applications resulting from the FCC's review process or any significant delay in
their approval could adversely affect the Company's financial position,  results
of operations and cash flows.

The Company's  license  requires that it comply with a  construction  and launch
schedule specified by the FCC for each of the three authorized  satellites.  The
second  and  third  satellites  are not in  compliance  with  the  schedule  for
commencement of construction.  The Company has asked the FCC to grant extensions
of the deadlines for the second and third satellites. Certain of these extension
requests  have  been  opposed  by third  parties.  The FCC has not  acted on the
Company's  requests.  The FCC has the authority to revoke the authorizations for
the second and third  satellites and in connection  with such  revocation  could
exercise its authority to rescind the Company's  license.  The Company  believes
that the exercise of such authority to rescind the license is unlikely.

As a provider of interstate telecommunications services, the Company is required
to contribute to the FCC's universal  service fund, which supports the provision
of  telecommunication  services to  high-cost  areas,  and  establishes  funding
mechanisms  to support the provision of service to schools,  libraries and rural
health care providers.  The regulation became effective on January 1, 1998. This
cost  is not  born by the  Company,  but is  passed  on to its  customers  as is
universally practiced in the industry.


                                      F-39





In 1992, a former director of American Mobile filed an Amended Complaint against
the Company alleging  violations of the  Communications Act of 1934, as amended,
and of the Sherman Act and breach of  contract.  The suit seeks  damages for not
less than $100 million  trebled under the antitrust laws plus punitive  damages,
interest,  attorneys fees and costs. In mid-1992, the Company filed its response
denying all  allegations.  The Company's motion for summary  judgment,  filed on
March  31,  1994,  was  denied  on April 18,  1996.  The  trial in this  matter,
previously  set for December 1997, has been postponed to a date to be determined
in 1998.  Management  believes that the ultimate outcome of this matter will not
be material to the Company's financial  position,  results of operations or cash
flows.


Other Matters

As previously  reported,  the satellite  has, in the past,  experienced  certain
technological anomalies, most significantly with respect to its eastern beam. On
August 1,  1996,  the  Company  reached a  resolution  of the  claims  under its
satellite  insurance  contracts and policies and received proceeds in the amount
of $66.0  million  which were used to repay the  Working  Capital  Facility  and
portions of the Term Loan  Facility and the Vendor  Financing.  Based on certain
engineering  studies and the design of the satellite,  the Company believes that
the  insurance  proceeds  reflected  the actual cost of damage  sustained to the
satellite,  and, as a result, the carrying value of the satellite was reduced by
the net insurance proceeds, which resulted in a reduction of future depreciation
charges  beginning in the third quarter of 1996.  There can be no assurance that
the satellite will not  experience  subsequent  anomalies  that could  adversely
impact the Company's financial condition, results of operations and cash flows.

The Company has received a current  recommendation  from a subcontractor  to its
satellite   manufacturer   that,   pending   further  results  from  an  ongoing
investigation,  the satellite  should be operated at modified  power  management
levels. The Company and its satellite  manufacturer are investigating the basis,
if any, for this  recommendation.  Based on the  information  available to date,
management  believes  that,  even if  maintained,  the current power  management
recommendation  would  not have a  material  negative  effect  on the  Company's
business plan within the next three to five years, based on anticipated  traffic
patterns and anticipated  subscriber  levels. In the event that traffic patterns
or subscriber levels materially exceed those  anticipated,  the power management
recommendation,  if  maintained,  could have a material  impact on the Company's
long-term business plan.




                                      F-40





14. SUPPLEMENTAL CASH FLOW INFORMATION




                                                                                          Years Ended December 31
(in thousands)                                                                       1997          1996           1995

                                                                                                          
Noncash investing and financing activities:
Leased asset and related obligations                                                 $182          $284         $1,351
Issuance of Common Stock purchase warrants                                         12,490        21,253             --
Issuance of Common Stock upon exercise of Common
  Stock purchase warrants                                                              --           845             --
Vendor financing for property under construction                                       --            --          7,561
Vendor financing for property in service                                               --         2,440          4,560
Issuance of Common Stock under the Defined Contribution Plan                          349           411            329
Net assets acquired as a result of Business Acquisition (Note 12)                      --         3,488             --



NOTE 15 - SUBSEQUENT EVENTS

During  the  first  quarter  of 1998,  the  Company  entered  into a  series  of
transactions. These transactions, some of which contain certain contingencies to
closing,  include the  acquisition of ARDIS and related $335 million  financing;
the restructuring of the Bank Financing; and a commitment by Motorola to provide
the Company with up to $10 million of vendor financing  related to the build out
of the ARDIS network.


Stock Purchase Agreement and Related Financing

As discussed in Note 1, on December 31, 1997,  the Company  entered into a Stock
Purchase  Agreement  with  Motorola  for the  acquisition  of ARDIS,  a Motorola
subsidiary  that  owns and  operates  a  two-way  wireless  data  communications
network.   Subject  to  certain   post-acquisition   purchase  price   reduction
provisions,  the Company would acquire ARDIS for a purchase price of $50 million
in cash and $50 million in the Company's stock and warrants. The transaction was
subject to certain governmental  approvals,  including FCC approvals to transfer
the ARDIS  licenses  to the  Company,  and was  subject to the  completion  of a
financing  by the  Company  in an  amount  sufficient  to fund the  transactions
contemplated  under the Stock  Purchase  Agreement.  On March 3,  1998,  the FCC
granted  consent to  consummate  the  Acquisition,  and on March 31,  1998,  the
Acquisition was consummated.


$335 Million Unit Offering

In  connection  with the  Acquisition,  the  Company  formed a new  wholly-owned
subsidiary ("Acquisition Company") to hold the stock of all current wholly-owned
operating  subsidiaries,   acquire  ARDIS,  and  issue  $335  million  of  Units
consisting of 12 1/4% Senior Notes due 2008 of Acquisition Company, and Warrants
to purchase shares of Common Stock of the Company.  Each Unit consists of $1,000




                                      F-41



principal  amount of Notes and one Warrant to purchase  3.75749 shares of Common
Stock at an exercise price of $12.51 per share. A portion of the net proceeds of
the sale of the Units were used to finance the Acquisition.  The Notes are fully
guaranteed  by American  Mobile  Satellite  Corporation.  The terms of the Notes
require  that the Company  purchase a portfolio  of U.S.  government  securities
(approximately $113 million), which will provide funds sufficient to pay in full
when due the first six scheduled semi-annual interest payments on the Notes. The
Company  intends to use the  remaining  proceeds  from the Notes to fund certain
required escrows, repay the Bridge Loan, repay certain deferred obligations, pay
expenses associated with the Acquisition and the $335 Million Unit Offering,  to
repay the Revolving  Credit Facility under the Bank  Financing,  and for working
capital requirements.


New Bank Financing

In connection with the Acquisition, the Company, the Acquisition Company and its
subsidiaries  restructured  the existing $200 million Bank  Financing to provide
for the New Bank Financing:  (i) the Revolving Credit  Facility,  a $100 million
unsecured  five-year reducing revolving credit facility,  and (ii) the Term Loan
Facility,  a $100  million  five-year,  term  loan  facility  with  up to  three
additional one-year  extensions subject to the lenders' approval.  The Revolving
Credit Facility will be the obligation of Acquisition Company and will rank pari
passu with the Notes.  The Term Loan Facility will be the obligation of American
Mobile Satellite Corporation and is secured by the stockholdings of the Company,
principally its stockholdings in AMRC and the Acquisition  Company,  and will be
effectively subordinated to the Revolving Credit Facility and the Notes. The New
Bank Financing is severally  guaranteed by Hughes,  Singapore  Telecom and Baron
Capital Partners,  L.P. (the "Bank Facility  Guarantors").  The Banks' placement
fee for the New Bank Financing is approximately $500,000.

The Revolving  Credit  Facility bears an interest rate,  generally,  of 50 basis
points above LIBOR and is unsecured, with a negative pledge on the assets of the
Acquisition Company and its subsidiaries  ranking pari passu with the Notes. The
Revolving  Credit  Facility will be reduced $10 million each quarter,  beginning
with the quarter ending June 30, 2002, with the balance due on maturity of March
31, 2003. Certain proceeds received by the Acquisition Company would be required
to repay and reduce the Revolving  Credit  Facility,  unless otherwise waived by
the  Banks  and the Bank  Facility  Guarantors:  (1) 100% of  excess  cash  flow
obtained by the Acquisition Company; (2) the first $25.0 million net proceeds of
the lease or sale of MSAT-2 received by the Acquisition  Company, and thereafter
75% of the remaining  proceeds  received from such lease or sale (the  remaining
25% may be retained by the  Acquisition  Company for business  operations);  (3)
100% of the proceeds of any other asset sales by the  Acquisition  Company;  (4)
50% of the net proceeds of any  offerings of the  Acquisition  Company's  equity
(the  remaining  50% to be retained  by the  Acquisition  Company  for  business
operations);  and (5) 100% of any major casualty  proceeds.  At such time as the
Revolving  Credit Facility is repaid in full, and subject to satisfaction of the
restrictive  payments provisions of the Notes, any prepayment amounts that would
otherwise  have  been used to  prepay  the  Revolving  Credit  Facility  will be
dividended to the Company.

The Term Loan Facility  bears an interest  rate,  generally,  of 50 basis points
above  LIBOR and is  secured  by the  assets  of the  Company,  principally  its


                                      F-42




stockholdings in AMRC and the Acquisition  Company. The Term Loan Agreement does
not include any scheduled  amortization until maturity, but does contain certain
provisions for  prepayment  based on certain  proceeds  received by the Company,
unless otherwise waived by the Banks and the Bank Facility Guarantors:  (1) 100%
of excess cash flow  obtained by the  Company;  (2) the first $25.0  million net
proceeds of the lease or sale of MSAT-2 received by the Company,  and thereafter
75% of the remaining  proceeds  received from such lease or sale (the  remaining
25% to be retained by the Acquisition Company for business operations); (3) 100%
of the  proceeds  of any other asset  sales by the  Company;  (4) 50% of the net
proceeds  of any  equity  offerings  of the  Company  (the  remaining  50% to be
retained  by the  Company for  business  operations);  and (5) 100% of any major
casualty  proceeds of the Company.  To the extent that the Term Loan Facility is
repaid, the aforementioned proceeds that would otherwise have been used to repay
the Term Loan Facility will be used to repay and reduce the commitment under the
Revolving Credit Facility.


The Guarantees

In connection  with the New Bank  Financing,  the Bank Facility  Guarantors have
agreed  to  extend  separate  guarantees  of  the  obligations  of  each  of the
Acquisition  Company  and the  Company  to the Banks,  which on a several  basis
aggregate  to $200  million.  In their  agreement  with each of the  Acquisition
Company and the Company (the "Guarantee Issuance Agreement"),  the Bank Facility
Guarantors  have  agreed to make  their  guarantees  available  for the New Bank
Financing.  The Guarantee  Issuance  Agreement will include  certain  additional
agreements of the Acquisition  Company and of the Company including with respect
to financial  performance of the  Acquisition  Company  relating to the ratio of
debt to EBITDA and service  revenue,  which,  if not met,  could, if not waived,
limit the Acquisition Company's ability to draw down on additional amounts under
the  Revolving  Credit  Facility  and  result  in a  default  under the New Bank
Financing  beginning in 1999. In exchange for the additional risks undertaken by
the Bank  Facility  Guarantors in connection  with the New Bank  Financing,  the
Company has agreed to compensate  the Bank Facility  Guarantors,  principally in
the form of 1 million  additional  warrants  and  repricing  and  extending  the
expiration date of 5.5 million warrants  previously issued  (together,  the "New
Guarantee Warrants").  The New Guarantee Warrants will be on terms substantially
similar, including with regard to pricing, as those issued as part of the Units.

Further,  in connection with the Guarantee Issuance  Agreement,  the Company has
agreed  to  reimburse  the  Bank  Facility  Guarantors  in the  event  that  the
Guarantors  are required to make payment  under the  Revolving  Credit  Facility
guarantees,  and, in connection with this Reimbursement  Commitment has provided
the Bank  Facility  Guarantors a junior  security  interest  with respect to the
assets of the Company, principally its stockholdings in AMRC and the Acquisition
Company.


Motorola Vendor Financing

Motorola has agreed to provide the Acquisition  Company with up to $10.0 million
of vendor financing (the "Vendor Financing Commitment"), which will be available
to finance up to 75% of the purchase price of additional  network base stations.
Loans under this  facility will bear interest at a rate equal to LIBOR plus 7.0%
and will be  guaranteed by the Company and each  subsidiary  of the  Acquisition


                                      F-43




Company.  The terms of such  facility  will  require  that  amounts  borrowed be
secured by the  equipment  purchased  therewith.  This  commitment is subject to
customary  conditions,  including due  diligence,  and there can be no assurance
that the facility will be obtained by the Acquisition  Company on these terms or
at all.




NOTE 16 - FINANCIAL STATEMENTS OF SUBSIDIARIES

In connection with the Acquisition and related  financing  discussed in Note 15,
the Company formed a new wholly-owned subsidiary, AMSC Acquisition Company, Inc.
The Company  intends to transfer all of its rights,  title and interests in AMSC
Subsidiary  Corporation,  American Mobile Satellite Sales Corporation,  and AMSC
Sales Corp. Ltd. (together,  "American Mobile Subsidiaries") to AMSC Acquisition
Company, Inc.

AMSC Acquisition  Company,  Inc. will be the acquirer of ARDIS and the issuer of
the  $335  million  of  Senior  Notes.  American  Mobile  Satellite  Corporation
("Parent")  will  guarantee  the Senior  Notes.  The Senior  Notes will  contain
covenants  that,  among  other  things,  limit the  ability of AMSC  Acquisition
Company,  Inc. to incur  additional  indebtedness,  pay  dividends or make other
distributions,  repurchase any capital stock or subordinated indebtedness,  make
certain investments,  create certain liens, enter into certain transactions with
affiliates,  sell assets,  enter into certain  mergers and  consolidations,  and
enter into sale and leaseback transactions.

The combined condensed financial  statements of American Mobile Subsidiaries are
set forth below.



                                      F-44





                          American Mobile Subsidiaries
                           Combined Statements of Loss
                             (dollars in thousands)
              for the years ended December 31, 1997, 1996, and 1995




                                                     Years Ended December 31

                                              1997          1996         1995


REVENUES

                                                               
       Services                             $20,684        $9,201      $6,873
       Sales of equipment                    23,530        18,529       1,924
                                             ------        -------     ------

       Total Revenues                        44,214        27,730       8,797


COSTS AND EXPENSES:

       Cost of service and operations        31,959        30 471      23,863
       Cost of equipment sold                40,335        31,903       4,676
       Sales and advertising                 12,030        24,541      22,683
       General and administrative            14,890        16,212      17,285
       Depreciation and amortization         44,535        45,496      11,568
                                             ------        ------      ------

       Operating Loss                       (99,535)     (120,893)    (71,278)


INTEREST AND OTHER  INCOME                    1,122           552       1,242
INTEREST EXPENSE                            (51,153)      (44,636)     (3,305)
                                            --------      --------     -------

NET LOSS                                  $(149,566)    $(164,977)   $(73,341)
                                           =========      ========     =======  





                                      F-45





                          American Mobile Subsidiaries
                             Combined Balance Sheets
                             (dollars in thousands)
                        as of December 31, 1997 and 1996



ASSETS                                                1997           1996


CURRENT ASSETS:

                                                                 
      Cash and cash equivalents                      $2,106         $2,182
      Inventory                                      40,321         38,034
      Prepaid in-orbit insurance                      4,564          5,080
      Accounts receivable-trade, net 
        of allowance for doubtful accounts            8,140          6,603
      Other current assets                            9,608         14,247
                                                      -----         ------
             Total current assets                    64,739         66,146

PROPERTY AND EQUIPMENT - NET                        250,335        287,127

DEFERRED CHARGES AND OTHER ASSETS:                   36,722         33,264
                                                     ------         ------

             Total assets                          $351,796       $386,537
                                                    =======        =======
LIABILITIES AND STOCKHOLDERS' EQUITY


CURRENT LIABILITIES:

      Accounts payable and accrued expenses         $35,825        $42,612
      Obligations under capital leases due 
        within one year                                 798          3,931
      Current portion of long-term debt              15,254         11,113
      Other current liabilities                       7,520             --
                                                      -----         ------
             Total current liabilities               59,397         57,656


DUE TO PARENT                                       441,836        400,831



LONG-TERM LIABILITIES:

      Obligations under Bank Financing              198,000        127,000
      Capital lease obligations                       3,147          2,557
      Net assets acquired in excess 
        of purchase price (Note 12)                   2,725          3,395
      Other long-term liabilities                     2,011            852
                                                    -------        -------

             Total long-term liabilities            205,883        133,804
                                                    -------        -------

             Total liabilities                      707,116        592,291
                                                    -------        -------

STOCKHOLDERS' EQUITY:                              (355,320)     (205,754)
                                                    -------       -------

             Total liabilities and 
               stockholders' equity                $351,796       $386,537
                                                   ========       ========



                                      F-46





                          American Mobile Subsidiaries
                   Combined Statements of Stockholders' Equity
                             (dollars in thousands)
          for the period from January 1, 1995 through December 31, 1997




                                      Total


BALANCE, December 31, 1994                                           $   32,564
    Net Loss                                                            (73,341)
                                                                        --------
BALANCE, December 31, 1995                                              (40,777)
    Net Loss                                                           (164,977)
                                                                        --------
BALANCE, December 31, 1996                                             (205,754)
    Net Loss                                                           (149,566)
                                                                        --------
BALANCE, December 31, 1997                                           $ (355,320)
                                                                       =========


                                      F-47





                          American Mobile Subsidiaries
                        Combined Statements of Cash Flows
                             (dollars in thousands)
              for the years ended December 31, 1997, 1996, and 1995




                                                                   Years Ended December 31
                                                          ------------------------------------------
                                                               1997          1996          1995

CASH FLOWS FROM OPERATING ACTIVITIES:
                                                                                        
Net loss                                                      $(149,566)     $(164,977)    $(73,341)
Adjustments to reconcile net loss to net cash used in
operating activities:
             Amortization of debt discount                        9,350          5,721           --
             Depreciation and amortization                       44,535         45,413       11,568
             Changes in assets and liabilities:
                 Inventory                                       (2,287)       (27,482)     (10,438)
                 Prepaid in-orbit insurance                         516           (257)      (4,823)
                 Trade accounts receivable                       (1,537)        (5,229)         218
                 Other current assets                             4,639          1,970       (5,280)
                 Accounts payable and accrued expenses           (5,844)         1,668       23,414
                 Deferred trade payables                         11,685             --           --
                 Deferred items - net                             8,038          1,347       (1,730)
                                                                  -----          -----       -------

Net cash used in operating activities                           (80,471)      (141,826)     (60,412)
                                                                --------      ---------     --------


CASH FLOWS FROM INVESTING ACTIVITIES:
Insurance proceeds applied to equipment in service                   --         66,000           --
Additions to property and equipment                              (8,598)       (14,054)     (83,776)
Purchases of short-term investments                                  --         (1,000)          --
Deferred charges and other assets                                    --             --         (169)
                                                                 ------         ------      --------

Net cash provided by (used in) investing activities              (8,598)        50,946      (83,945)
                                                                -------        ------      --------

CASH FLOWS FROM FINANCING ACTIVITIES:

Funding from Parent                                              28,220         29,485      164,835
Principal payments under capital leases                          (2,576)        (3,994)        (538)
Proceeds from short-term borrowings                                  --         70,000           --
Payments on short-term borrowings                                    --        (70,000)          --
Proceeds from Bank Financing                                     71,000        127,000           --
Proceeds from debt issuance                                          --          1,700        7,630
Payments on long-term debt                                       (6,180)       (59,190)     (28,486)
Debt issuance costs                                              (1,471)       (10,803)      (1,081)
                                                                 -------       --------      -------

Net cash provided by (used in) financing activities              88,993         84,198      142,360

Net decrease in cash and cash equivalents                           (76)        (6,682)      (1,997)

CASH AND CASH EQUIVALENTS, beginning of period                    2,182          8,864       10,861
                                                                  -----          -----       ------
CASH AND CASH EQUIVALENTS, end of period                         $2,106         $2,182       $8,864
                                                                 ======         ======       ======





                                      F-48






                      QUARTERLY FINANCIAL DATA (unaudited)
                (dollars in thousands, except for per share data)




                                                         1997-quarters                                     1996-quarters
                                      1st         2nd         3rd          4th         1st          2nd         3rd          4th
                                      ---         ---         ---          ---         ---          ---         ---          ---
                                                                                                     
Revenues                            $8,685      $10,753     $10,795      $13,981     $4,369       $6,749      $7,405       $9,207
Operating expenses(1)               32,341       32,420      30,617       46,231     31,371       45,747      33,914       36,737
Loss from operations               (23,656)     (21,667)    (19,822)     (32,250)   (27,002)     (38,998)    (26,509)     (27,530)
Interest and other 
  income (expense)                  (3,425)      (5,175)     (6,442)      (6,770)    (2,875)      (4,511)     (3,493)      (3,720)
Net Loss                           (27,081)     (26,842)    (26,264)     (39,020)   (29,877)     (43,509)    (30,002)     (31,250)
Net loss per common share (2)       $(1.08)      $(1.07)     $(1.04)      $(1.55)    $(1.20)      $(1.74)     $(1.20)      $(1.24)


Weighted-average common shares
outstanding during the 
  period (000s)                     25,109       25,120      25,145       25,151     24,995       25,012      25,065       25,092

Market price per share (3)
   High                             $14.75       $12.13      $10.88       $10.75     $33.25       $20.00      $17.50       $14.62
   Low                               $9.37        $8.50       $6.23        $6.28     $16.00       $15.00      $10.75        $9.25





(1)  Operating  expenses  include charges of  approximately  $12  million in the
     fourth  quarter of 1997 and $11.1  million  in the  second  quarter of 1996
     related to the realizability of the Company's inventory investment.

(2)  Loss per  share  calculations  for each of the  quarters  are  based on the
     weighted average number of shares outstanding for each of the periods,  and
     the sum of the quarters may not  necessarily be equal to the full year loss
     per share amount.

(3)  The  Company's  Common  Stock is listed under the symbol SKYC on the Nasdaq
     National Market System.  The Company's Common Stock was not publicly traded
     prior  to  December  14,  1993.  The  quarterly  high and low  sales  price
     represents  the closing price in the Nasdaq  National  Market  System.  The
     quotations  represent  inter-dealer  quotations,  without  retail  markups,
     markdowns  or  commissions,   and  may  not  necessarily  represent  actual
     transactions.  As of February  28,  1998,  there were 251  stockholders  of
     record of the Company's Common Stock.

                                      F-49





Selected Financial Data

Set forth  below is the  selected  financial  data for the  Company for the five
fiscal years ended December 31, 1997:





(dollars in thousands, except for per share data)
                                                         1997          1996             1995          1994           1993
                                                         ----          ----             ----          ----           ----
                                                                                                      
Revenues                                               $44,214       $27,730           $8,797        $5,240           $852
Net Loss                                             $(119,207)    $(134,638)        $(66,917)     $(21,103)      $(25,180)
Net Loss per Common Share                               $(4.74)       $(5.38)          $(2.69)       $(0.86)        $(2.49)
Dividends on Common Stock (1)                             None          None             None          None           None
Consolidated Balance Sheet Data:
Cash and Cash Equivalents                               $2,106        $2,182           $8,865      $137,287       $243,060
Property Under Construction                                 --            --               --       263,505        204,740
Total Assets                                           311,447       350,173          398,351       448,674        460,382
Current Liabilities                                     59,433        57,669          104,772        37,251         36,309
Long-Term Obligations                                  205,883       133,804            6,052        59,879         56,703
Stockholders' Equity                                    46,131       158,700          287,527       351,544        367,370



(1)      The Company has paid no dividends  on its Common Stock since  inception
         and  does  not  plan  to pay  dividends  on  its  Common  Stock  in the
         foreseeable future. In addition, the payment of dividends is subject to
         restrictions  described  in  Note 7 to  the  financial  statements  and
         discussed in Management's Discussion and Analysis.

                                      F-50







 REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS





To American Mobile Satellite Corporation

We have audited in accordance with generally  accepted auditing  standards,  the
consolidated  financial statements of American Mobile Satellite  Corporation and
Subsidiaries (a Delaware corporation) included in this Form 10-K and have issued
our report thereon dated March 31, 1998. Our audits were made for the purpose of
forming an  opinion  on the basic  financial  statements  taken as a whole.  The
schedule listed in the index is the  responsibility of the Company's  management
and is  presented  for purposes of complying  with the  Securities  and Exchange
Commission's  rules  and is not  part of the  basic  financial  statements.  The
schedule has been subjected to the auditing  procedures applied in the audits of
the  basic  financial  statements  and,  in our  opinion,  fairly  states in all
material  respects  the  financial  data  required  to be set forth  therein  in
relation to the basic financial statements taken as a whole.




/s/ Arthur Andersen LLP
Washington, D.C.
March 31, 1998

                                      




                                                                      SCHEDULE I

                      AMERICAN MOBILE SATELLITE CORPORATION

                  CONDENSED FINANCIAL INFORMATION OF REGISTRANT
                              (Parent Company Only)

                            Condensed Balance Sheets






                                                                              December 31,
                                                                               1997              1996
                                                                        (in thousands of dollars)
ASSETS
                                                                                              
Investment in and amounts due from  subsidiaries                          $  46,168            $158,713
                                                                          ---------            --------
Total assets                                                              $  46,168            $158,713
                                                                          =========            ========
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses                                           $37                 $13
                                                                                ---                 ---
Stockholders' Equity
  Preferred Stock                                                                --                  --
  Common Stock                                                                  252                 251
  Additional paid-in capital                                                451,892             451,259
  Common stock purchase warrants                                             36,338              23,848
  Unamortized stock purchase warrants                                       (23,586)            (17,100)
  Accumulated loss                                                         (418,765)           (299,558)
                                                                           ---------           ---------
Total Stockholders' Equity                                                   46,131             158,700
                                                                             ------             -------
Total Liabilities and Stockholders' Equity                                $  46,168            $158,713
                                                                          =========            ========


The  accompanying  notes  are an  integral  part  of  this  condensed  financial
information.

                                       S-1




                                                                      SCHEDULE I

                      AMERICAN MOBILE SATELLITE CORPORATION

                  CONDENSED FINANCIAL INFORMATION OF REGISTRANT
                              (Parent Company Only)

                          Condensed Statements of Loss




                                                                                      For the Years Ended December 31,
                                                                                 1997             1996                1995
                                                                                 ----             ----                ----
                                                                                                            
Management fees from wholly-owned subsidiary                                   $1,200           $1,200              $1,200
                                                                               ------           ------              ------
Operating Expenses
          Engineering operations                                                   --               --                  87
          Sales and marketing                                                      36               --                  91
          General and administrative                                            1,129            2,452                 595
                                                                                -----            -----                ----
          Total operating expenses                                              1,165            2,452                 773
                                                                                -----            -----                ----

Income (loss) from operations                                                      35           (1,252)                427
Interest income                                                                    --               --               3,258
Interest expenses                                                              (6,005)          (1,900)                 --
Equity loss in AMRC                                                            (1,301)              --                  --
                                                                             ---------        ---------          ---------
(Loss) income before net loss of Acquisition Company                           (7,271)          (3,152)              3,685
          Net loss of Acquisition Company - Note A                           (111,936)        (131,486)            (70,602)
                                                                             ---------        ---------            --------
Net Loss                                                                    $(119,207)       $(134,638)           $(66,917)
                                                                            ==========       ==========          ==========


The  accompanying  notes  are an  integral  part  of  this  condensed  financial
information.


                                       S-2




                                                                      SCHEDULE I

                      AMERICAN MOBILE SATELLITE CORPORATION

                  CONDENSED FINANCIAL INFORMATION OF REGISTRANT
                              (Parent Company Only)


                       Condensed Statements of Cash Flows



                                                                             For the Years Ended December 31,
                                                                        1997             1996               1995
                                                                        ----             ----               ----
                                                                                                    
Cash Provided from Operating Activities                               $   59            $1,424              $5,067
Investing Activities
         Advances to and investment in subsidiaries                     (343)           (2,672)           (162,778)
         Sales of short-term investments, net                             --                --              28,717
                                                                      ------           -------            --------
Cash (used in) investing activities                                     (343)           (2,672)           (134,061)
Financing Activities
         Proceeds from sale of Common Stock                              284             1,248               2,569
                                                                       -----             -----               -----

Cash Provided by Financing Activities                                    284             1,248               2,569
                                                                       -----             -----               -----
(Decrease) increase for the period                                        --                --            (126,425)
Beginning of period                                                       --                --             126,425
                                                                       -----             -----               -----        
End of period                                                         $   --           $    --            $     --
                                                                      ======           =======            ========



The  accompanying  notes  are an  integral  part  of  this  condensed  financial
information.


                                       S-3




                                                                      SCHEDULE I

                      AMERICAN MOBILE SATELLITE CORPORATION

                  CONDENSED FINANCIAL INFORMATION OF REGISTRANT
                              (Parent Company Only)

                     Notes to Condensed Financial Statements

The  condensed  financial  information  should be read in  conjunction  with the
consolidated financial statements.

Note A -- Background and Basis of Presentation

American Mobile Satellite Corporation (with its subsidiaries,  "American Mobile"
or the  "Company")  was  incorporated  on May 3, 1988,  by eight of the  initial
applicants for the mobile satellite services license,  following a determination
by the Federal Communications  Commission ("FCC") that the public interest would
be best served by granting the license to a consortium of all willing, qualified
applicants.  The FCC has authorized  American Mobile to construct,  launch,  and
operate a mobile satellite services system (the "Satellite Network ") to provide
a full range of mobile voice and data  services via  satellite to land,  air and
sea-based  customers  in a service area  consisting  of the  continental  United
States,  Alaska,  Hawaii,  Puerto Rico, the U.S.  Virgin Islands,  U.S.  coastal
waters,  international  waters and airspace and any foreign  territory where the
local  government  has  authorized  the  provision  of  service.  In March 1991,
American Mobile Satellite Corporation  transferred the mobile satellite services
license ("MSS license") to a wholly owned subsidiary, American Mobile Subsidiary
Corporation  ("AMSC  Subsidiary").  On April 7, 1995,  the Company  successfully
launched its first satellite ("MSAT-2"), from Cape Canaveral, Florida.

In late  1996,  the  Company  expanded  its mobile  data  business  through  the
acquisition  of  Rockwell  International  Corporation's  ("Rockwell")  dual mode
mobile  messaging and global  positioning and monitoring  service for commercial
trucking  fleets.  Rockwell was a private network  customer of the Company which
had purchased capacity from the Company on MSAT-2.

On December 31, 1997, the Company  entered into a Stock Purchase  Agreement (the
"Purchase Agreement") with Motorola, Inc. ("Motorola"), for the acquisition (the
"Acquisition") of ARDIS Company ("ARDIS"), a wholly-owned subsidiary of Motorola
that owns and operates a two-way wireless data communications  network.  Subject
to certain purchase price adjustment provisions,  the Company will acquire ARDIS
for a purchase  price of $50  million in cash and $50  million in the  Company's
Common Stock and  warrants  (the  "Purchase  Price").  The Company,  through the
acquisition  of ARDIS,  intends  to create a  nationwide  provider  of  wireless
communications services, including data, dispatch, and voice services, primarily
to business customers in the United States.

On October 16, 1997,  American Mobile Radio Corporation,  an indirect subsidiary
of American  Mobile through its subsidiary  AMRC Holdings,  Inc.  (together with
American Mobile Radio Corporation,  "AMRC"), was awarded a license by the FCC to
provide  satellite-based  Digital Audio Radio Service  ("DARS")  throughout  the
United States, following its successful $89.9 million bid at auction on April 2,


                                       S-4




1997.  American  Mobile has entered  into an  agreement  with  WorldSpace,  Inc.
("WorldSpace"), by which WorldSpace has acquired a 20% participation in AMRC. In
connection  with the DARS  auction,  AMRC has also arranged for financing of the
FCC license fees as well as for initial working  capital needs,  which financing
has  included  the  issuance of options.  AMRC has and will  continue to receive
funding for this business from an independent source in exchange for debt and an
equity interest in AMRC. Accordingly, it is not expected that the development of
this business will have a material impact on the Company's  financial  position,
results of operations, or cash flows.

In the parent Company-only  financial  statements,  the Company's  investment in
subsidiaries  is  stated at cost less  losses of  subsidiaries.  The net loss of
subsidiaries is included in these financial  statements using the equity method.
The parent Company-only  statements exclude inter-company  interest. The Company
has entered into various transactions with its subsidiaries which are eliminated
in the December  31, 1997  audited  consolidated  financial  statements  and are
summarized as follows:

                                     1997              1996                1995
Investment in and amounts 
    due from subsidiaries          $46,167          $158,713            $287,527
Management fees                      1,200             1,200               1,200
Interest income                     29,520            29,485              23,445

Note B -- Investment in Subsidiaries

As stated in Note A, the Company  records its investment in  subsidiaries on the
equity  method.  In connection  with the  Acquisition,  the Company formed a new
wholly-owned subsidiary ("Acquisition Company") to hold the stock of all current
wholly-owned   operating   subsidiaries.   The   Acquisition   Company  has  six
wholly-owned subsidiaries. Additionally, the Company has an equity investment in
AMRC. The  recoverability  of such investment is subject to the risks associated
with expanding a developing business,  including successfully integrating ARDIS.
Specifically,  future operating results will be subject to significant business,
economic,    regulatory,    technical,   and   competitive   uncertainties   and
contingencies. Depending on their extent and timing, these factors, individually
or in the aggregate, could have an adverse effect on the Subsidiaries' financial
condition and future results of operations.

Adequate  liquidity  and capital are critical to the ability of the  Acquisition
Company  to  continue  as a going  concern  and to fund  subscriber  acquisition
programs  necessary  to reach  cash  positive  and  profitable  operations.  The
Acquisition  Company expects to continue to make significant capital outlays for
the  foreseeable  future to fund  interest  expense,  capital  expenditures  and
working capital prior to the time that it begins to generate  positive cash flow
from  operations and for the  foreseeable  future  thereafter.  The  Acquisition
Company  currently  believes  that  the net  proceeds  from the sale of the $335
million  in Notes and  warrants,  together  with the  borrowings  under the $200
million New Bank Financing,  the Motorola  financing,  and the proceeds from the
Satellite Lease  Agreement (all discussed  below) will be sufficient to meet the
Acquisition  Company's  currently  anticipated capital  expenditures,  operating
losses, working capital and debt service requirements through 1998 and beyond.


                                       S-5




However,  if the Acquisition  Company's cash flows from operations are less than
projected,  the  Acquisition  Company  may not  meet its  financial  performance
agreements under the Guaranty Issuance Agreement and, if such conditions are not
met or waived, the Acquisition Company would not have access to additional funds
under the Revolving  Credit  Facility.  In addition,  even in the event that the
Acquisition  Company has access to such funds, it may require additional debt or
equity  financing in amounts  that could be  substantial.  The type,  timing and
terms of financing  selected by the  Acquisition  Company will be dependent upon
the  Acquisition  Company's  cash needs,  the  availability  of other  financing
sources and the prevailing conditions in the financial markets.  There can be no
assurance that any such sources will be available to the Acquisition  Company at
any given time or as to the favorableness of the terms on which such sources may
be available.

In connection  with the ARDIS  Acquisition,  the Company  raised $335 million in
cash proceeds from the private issuance of units ("Units")  consisting of 12 1/4
% Senior Notes ("Notes") due 2008 and one warrant to purchase 3.75749  shares of
Common Stock of the Company for each $1,000 principal amount of Notes. The Notes
are fully guaranteed by American Mobile Satellite Corporation. Additionally, the
existing Bank Financing was restructured. The New Bank Financing of $200 million
will consist of a $100 million  unsecured  five-year  reducing  Revolving Credit
Facility maturing March 31, 2003 and a $100 million five-year Term Loan Facility
with up to three additional one-year extensions subject to lender approval.  The
Revolving Credit Facility will be the obligation of Acquisition Company and will
rank pari passu with the Notes. The Term Loan Facility will be the obligation of
American Mobile Satellite Corporation and is secured by the stockholdings of the
Company,  principally its stockholdings in AMRC and the Acquisition Company, and
will be effectively subordinated to the Revolving Credit Facility and the Notes.
The New Bank Financing is severally guaranteed by Hughes Electronics Corporation
("Hughes"),  Singapore  Telecommunications  Ltd. ("Singapore Telecom") and Baron
Capital Partners, L.P. (the "Bank Facility Guarantors").  Additionally, Motorola
has agreed to provide  the Company  with up to $10  million of vendor  financing
(the "Vendor  Financing  Commitment"),  which will be available to finance up to
75% of the purchase  price of  additional  base  stations  needed to meet ARDIS'
buildout  requirements  under  certain  customer  contracts.  Loans  under  this
facility will bear interest at a rate equal to LIBOR plus 7.0%.  This commitment
is subject to customary conditions, including due diligence, and there can be no
assurance  that the facility  will be obtained by  Acquisition  Company on these
terms or at all.

On December 4, 1997, the Company and one of its wholly-owned  subsidiaries (AMSC
Subsidiary) entered into two simultaneous transactions.  The Company agreed with
TMI to acquire a one-half  ownership  interest in TMI's satellite,  MSAT-1, at a
cost of $60 million payable in equal  installments  over a five-year period (the
"Satellite  Purchase  Agreement");   certain  additional  payments  to  TMI  are
contemplated in the event that additional  benefits are realized by the Company.
Simultaneously,  the Company  entered into an agreement  (the  "Satellite  Lease
Agreement") with African Continental  Telecommunications Ltd. ("ACTEL"), for the
lease of MSAT-2,  for deployment over  sub-Saharan  Africa.  The five-year lease
provides for  aggregate  lease  payments to the Company of $182.5  million.  The
lease includes a renewal  option  through the end of the life of MSAT-2,  on the
same lease terms, at ACTEL's  election  exercisable 2 1/2 years prior to the end
of the initial lease term.  Closing under the Satellite  Purchase  Agreement and
Satellite  Lease  Agreement  is  subject  to  a  number  of  conditions.  It  is
anticipated   that  the  closing  under  both  leasing   agreements  will  occur
simultaneously in the spring of 1998.

                                       S-6




Note C -- Guarantee

The Company has guaranteed  various  obligations of Acquisition  Company.  These
guaranteed  obligations  include amounts  borrowed under the New Bank Financing,
ground segment financing  agreements and obligations of Acquisition  Company and
its subsidiaries  under an office lease agreement and various capital  equipment
leases.


Note D -- Legal Matters

In 1992, a former director of American Mobile filed an Amended Complaint against
the Company alleging  violations of the  Communications Act of 1934, as amended,
and of the Sherman Act and breach of  contract.  The suit seeks  damages for not
less than $100 million  trebled under the antitrust laws plus punitive  damages,
interest,  attorneys fees and costs. In mid-1992, the Company filed its response
denying all  allegations.  The Company's motion for summary  judgment,  filed on
March  31,  1994,  was  denied  on April 18,  1996.  The  trial in this  matter,
previously  set for December 1997, has been postponed to a date to be determined
in 1998.  Management  believes that the ultimate outcome of this matter will not
be material to the Company's financial  position,  results of operations or cash
flows.



                                       S-7