EXHIBIT 10.9a

                      AMERICAN MOBILE SATELLITE CORPORATION
                      -------------------------------------
                1999 STOCK OPTION PLAN FOR NON-EMPLOYEE DIRECTORS
                -------------------------------------------------


                       ARTICLE I.  RESTATEMENT AND PURPOSES
                       ------------------------------------

         American  Mobile  Satellite  Company  (the  "Company")  maintained  the
American Mobile  Satellite  Corporation  1994 Stock Option Plan for Non-Employee
Directors (the "Prior Plan").  The Prior Plan has been amended and restated,  as
set forth  herein,  effective  March 25,  1999,  subject to the  approval of the
shareholders  of the Company  within twelve months of such  effective  date (the
"Plan").  Notwithstanding anything herein to the contrary,  nothing in this Plan
shall  adversely  affect  the rights or  obligations  of any holder of an Option
granted under the Prior Plan without such person's approval.

         The  purposes  of the Plan are to attract  and retain the  services  of
experienced  and  knowledgeable  non-employee  Directors  of the  Company and to
provide an incentive for such Directors to increase their proprietary  interests
in the Company's long-term success and progress.


                      ARTICLE II.  SHARES SUBJECT TO THE PLAN
                      ---------------------------------------

         Subject to adjustment in accordance  with Article VI hereof,  the total
number of shares of the Company's  Common  Stock,  $.01 par value per share (the
"Common Stock"), for which options may be granted under the Plan is 100,000 (the
"Shares,"  including,  for the purposes of this Article II, the Prior Plan). The
Shares  shall be shares of Common  Stock  presently  authorized  but unissued or
subsequently  acquired by the Company and shall include shares  representing the
unexercised  portion  of any  option  granted  under the Plan  which  expires or
terminates without being exercised in full.


                     ARTICLE III. ADMINISTRATION OF THE PLAN
                     ---------------------------------------

         The administrator of the Plan (the "Plan  Administrator")  shall be the
Board of  Directors  ("Board")  or a committee  or  committees  appointed by the
Board.  Subject to the terms of the Plan, the Plan Administrator  shall have the
power to construe the provisions of the Plan, to determine all questions arising
thereunder  and  to  adopt  and  amend  such  rules  and   regulations  for  the
administration  of the  Plan as it may deem  desirable.  No  member  of the Plan
Administrator  shall  participate in any vote by the Plan  Administrator  on any
matter materially affecting the rights of any such member under the Plan.


                      ARTICLE IV. PARTICIPATION IN THE PLAN
                      -------------------------------------

         Each member of the Board  elected or appointed  who is not otherwise an
employee of the Company or any  subsidiary  (an  "Eligible  Director")  shall be
eligible to receive the following option grants under the Plan:

1.       Initial Grant
         -------------

         An initial  grant (an "Initial  Grant") of an option to purchase  5,000
Shares shall  automatically be granted to each Eligible Director effective March
25, 1999, and to each person who becomes an Eligible Director following the date
of adoption of the Plan by the Board upon the earlier of the Eligible Director's
initial election or appointment as a Director of the Company.

         Each Initial  Grant shall be fully vested and  immediately  exercisable
upon grant.






2.       Additional Grants
         -----------------

         Commencing on July 1, 1999, each Eligible Director shall  automatically
receive an  additional  grant (an  "Additional  Grant") of an option to purchase
2,500 Shares on July 1 of each year (an "Additional Grant Date"); provided, that
an Eligible  Director who has  received an Initial  Grant within four (4) months
prior to an Additional  Grant Date shall not receive an  Additional  Grant until
the next year's Additional Grant Date.

         Each Additional Grant shall be fully vested and immediately exercisable
upon grant.

3.       Discretionary Grants
         --------------------

         The Plan Administrator shall have the authority and discretion to grant
additional  options to  Eligible  Directors  at such times and on such terms and
conditions as it may determine.


                             ARTICLE V. OPTION TERMS
                             -----------------------

         Each  option  grant  to an  Eligible  Director  under  the Plan and the
issuance of Shares thereunder shall be subject to the following terms:

1.       Option Agreement
         ----------------

         Each option grant to an Eligible Director under Section 3 of Article IV
of the Plan shall have such terms and  conditions  as may be  determined  by the
Plan Administrator. Each option grant to an Eligible Director under Section 1 or
2 of  Article  IV of the Plan and the  issuance  of shares  thereunder  shall be
subject to the term set forth in this Article V.

2.       Option Exercise Price
         ---------------------

         The option exercise price for an option granted under the Plan shall be
the fair market value of the Shares covered by the option at the time the option
is granted.  For purposes of the Plan,  "fair market value" of a Share means the
amount  equal  to the  average  of the  high  and low  prices  of a Share on the
applicable date as reported by the consolidated tape of the National Association
of Securities Dealers Automated Quotation (or on such other recognized quotation
system  on which  the  trade  prices  of the  Common  Stock  are  quoted  on the
applicable  date),  or, if no Share  transactions  are reported on such tape (or
such other system) on the applicable date, the high and low prices of a Share on
the immediately  preceding date on which Share transactions were so reported, or
as determined  pursuant to a reasonable method adopted by the Plan Administrator
in good faith for such purposes.

3.       Time and Manner of Exercise of Option
         -------------------------------------

         Each option may be  exercised  in whole or in part at any time and from
time to time, subject to shareholder  approval of the Plan;  provided,  however,
that the Company shall not be required to issue fractional shares.

         Any option may be exercised  by giving  written  notice,  signed by the
person  exercising the option,  to the Company stating the number of Shares with
respect to which the option is being  exercised,  accompanied by payment in full
for  such  Shares,  which  payment  may be in whole or in part (i) in cash or by
check, (ii) in shares of Common Stock (by delivery or attestation) already owned
for at least six (6) months by the person exercising the option,  valued at fair
market  value at the time of such  exercise,  or (iii) by delivery of a properly
executed exercise notice, together with a copy of irrevocable  instructions to a
broker,  to properly  deliver to the Company the amount of sale or loan proceeds
to pay the exercise plan.

4.       Term of Options
         ---------------

         Each option  shall  expire ten (10) years from the date of the granting
thereof, but shall be subject to earlier termination as follows:






                  (a) In the event that an  optionee  ceases to be a Director of
         the Company for any reason  other than the death of the  optionee,  the
         options  granted to such optionee may be exercised by the optionee only
         within  seven (7)  months  after the date the  optionee  ceases to be a
         Director of the Company.

                  (b) In the event of the death or an optionee,  whether  during
         the  optionee's  service  as a  Director  or during the seven (7) month
         period referred to in Section 4(a), the options granted to the optionee
         shall be  exercisable,  and such options shall expire unless  exercised
         within twelve (12) months after the date of the  optionee's  death,  by
         the legal representatives or the estate of such optionee, by any person
         or persons whom the optionee shall have  designated in writing on forms
         prescribed by and filed with the Company or, if no such designation has
         been made, by the person or persons to whom the optionee's  rights have
         passed by will or the laws of descent and distribution.

5.       Transferability
         ---------------

         Except as otherwise  permitted by the Plan Agreement or specified in an
Agreement, during an optionee's lifetime, an option may be exercised only by the
optionee  or  pursuant  to the terms of a  qualified  domestic  relations  order
("QDRO") as defined under the Internal Revenue Code of 1986, as amended. Options
granted under the Plan and the rights and privileges conferred thereby shall not
be  subject  to  execution,  attachment  or  similar  process  and  may  not  be
transferred,  assigned,  pledged  or  hypothecated  in any  manner  (whether  by
operation  of law or  otherwise)  other than by will or the  applicable  laws of
descent and  distribution  or  pursuant to the terms of a QDRO,  except that the
Plan  Administrator  may permit a recipient of an option to designate in writing
during the optionee's  lifetime a beneficiary to receive and exercise options in
the event of the  optionee's  death (as provided in Section 4(b) of this Article
V). Any attempt to transfer, assign, pledge, hypothecate or otherwise dispose of
any  option  under  the Plan or of any  right or  privilege  conferred  thereby,
contrary to the provisions of the Plan, or the sale or levy or any attachment or
similar process upon the rights and privileges conferred thereby,  shall be null
and void.

6.       Participant's or Successor's Rights as Shareholder
         --------------------------------------------------

         Neither the  recipient of an option  under the Plan nor the  optionee's
successor(s)  in interest  shall have any rights as a shareholder of the Company
with  respect to any Shares  subject to an option  granted to such person  until
such person becomes a holder of record of such Shares.

7.       Limitation as to Directorship
         -----------------------------

         Neither  the Plan nor the  granting  of an option nor any other  action
taken  pursuant to the Plan shall  constitute or be evidence of any agreement or
understanding, express or implied, that an optionee has a right to continue as a
Director for any period of time or at any particular rate of compensation.

8.       Regulatory Approval and Compliance
         ----------------------------------

         The  Company  shall  not  be  required  to  issue  any  certificate  or
certificates  for Shares upon the exercise of an option  granted under the Plan,
or record as a holder of record of Shares the name of the individual  exercising
an option under the Plan, without obtaining to the complete  satisfaction of the
Plan Administrator the approval of all regulatory bodies deemed necessary by the
Plan Administrator,  and without complying, to the Plan Administrator's complete
satisfaction,  with all rules and regulations under federal,  state or local law
deemed applicable by the Plan Administrator.


                         ARTICLE VI. CAPITAL ADJUSTMENTS
                         -------------------------------

         The  aggregate  number  and class of Shares  for which  options  may be
granted  under  the  Plan,  the  number  and  class of  Shares  covered  by each
outstanding  option and the exercise  price per Share thereof (but not the total
price) shall all be equitably adjusted by the Plan Administrator to reflect such
events   as  stock   dividends,   stock   splits,   or   exchange   of   shares,
recapitalizations,  mergers,  consolidations,  reorganizations  or  any  similar
transactions of or by the Company.






         In the event of any  adjustment in the number of Shares  covered by any
option,   any  fractional   Shares  resulting  from  such  adjustment  shall  be
disregarded  and each such  option  shall  cover only the number of full  Shares
resulting from such adjustment.


                        ARTICLE VII. EXPENSES OF THE PLAN
                        ---------------------------------

         All costs and expenses of the adoption and  administration  of the Plan
shall be borne by the  Company;  none of such  expenses  shall be charged to any
optionee.


              ARTICLE VIII. EFFECTIVE DATE AND DURATION OF THE PLAN
              -----------------------------------------------------

         The Plan, as an amendment and  restatement of the Prior Plan,  shall be
effective upon adoption by the Board subject to the approval of  shareholders of
the Company.  The Plan shall continue in effect until it is terminated by action
of the  Board or the  Company's  shareholders,  but such  termination  shall not
affect the then-outstanding terms of any options.


                ARTICLE IX. TERMINATION AND AMENDMENT OF THE PLAN
                -------------------------------------------------

         The Board may  amend,  terminate  or  suspend  the Plan or any  portion
thereof at any time, in its sole and absolute discretion.


                      ARTICLE X. COMPLIANCE WITH RULE 16B-3
                      -------------------------------------

         It is the  intention of the Company that the Plan comply in all respect
with Rule 16b-3 promulgated  under Section 16(b) of the Securities  Exchange Act
of 1934, as amended ("Exchange Act").  Therefore, if any Plan provision is later
found not be in compliance with Rule 16b-3,  that provision shall be deemed null
and void,  and in all events the Plan shall be construed in favor of its meeting
the requirements of Rule 16b-3.













                      AMERICAN MOBILE SATELLITE CORPORATION
                      -------------------------------------
                   NONQUALIFIED STOCK OPTION LETTER AGREEMENT
                   ------------------------------------------

TO:

         We are  pleased to inform you that,  pursuant  to the  American  Mobile
Satellite  Corporation's (the "Company") 1999 Stock Option Plan for Non-Employee
Directors (the "Plan"),  you have been granted a  nonqualified  stock option for
the purchase of _____ shares of the Company's  Common Stock at an exercise price
of $_____ per share. A copy of the Plan is attached and  incorporated  into this
Agreement by reference.  If the Plan is not approved by the  shareholders of the
Company, this option will be invalid and void ab initio.

         The  terms  of the  option  are as set  forth  in the  Plan and in this
Agreement.  The most  important of terms set forth in the Plan are summarized as
follows:

         Term:  The option  will  expire upon the earlier of ten (10) years from
the date of grant or within seven (7) months of your termination of service as a
Director of the Company, unless sooner terminated.

         Exercise:  During your lifetime  only you can exercise the option.  The
Plan also provides for exercise of the option in accordance  with the terms of a
qualified  domestic  relations  order  ("QDRO")  as defined  under the  Internal
Revenue Code of 1986, as amended, (the "Code") or by the personal representative
of your estate,  a designated  beneficiary  or other  beneficiary of your estate
following your death.  You may use the Notice of Exercise of Nonqualified  Stock
Option in the form attached to this Agreement when you exercise the option.

         Payment for Shares:  The option may be exercised by the delivery of:

         (a) Cash,  personal  check (unless,  at the time of exercise,  the Plan
Administrator determines otherwise), bank certified or cashier's check;

         (b) Unless the Plan  Administrator  in its sole  discretion  determines
otherwise,  shares  of  Common  Stock of the  Company  (either  by  delivery  or
attestation)  held by you for a period of at least six (6) months  having a fair
market value at the time of exercise,  as  determined  in good faith by the Plan
Administrator, equal to the exercise price; or

         (c) A properly  executed  exercise  notice  together  with  irrevocable
instructions to the Company-designated broker for cashless exercises to promptly
deliver to the Company the amount of sale or loan  proceeds to pay the  exercise
price.

         Termination:  If you  cease to be a  Director  of the  Company  for any
reason other than death,  and unless by its terms this option sooner  terminates
or expires, then you may exercise, for a seven (7) month period, that portion of
your option which is exercisable at the time of such  cessation,  but the option
shall  terminate at the end of such period  following  such  cessation as to all
shares for which it has not theretofore been exercised.

         Death of  Optionee:  If you die  while  serving  as a  Director  of the
Company  or  within  the  seven (7) month  period  following  cessation  of such
service,  this option  may,  to the extent that you would have been  entitled to
exercise this option, be exercised within twelve (12) months after your death by
the personal  representative  of your estate or by the person or persons to whom
your  rights  under  this  option  shall  pass by will,  designation,  or by the
applicable laws of descent and distribution, unless sooner terminated.

         Status  of  Shareholder:  Neither you nor any person or persons to whom
your rights and  privileges  under this option may pass shall be, or have any of
the rights or privileges of, a shareholder of the Company with respect to any of
the shares  issuable  upon the  exercise  of this  option  unless and until this
option has been exercised.







         Continuation  of Status as Director:  Nothing in this  Agreement  shall
confer  upon you any right to  continue  as a  Director  of the  Company,  or to
interfere in any way with the right of the Company to terminate  your service as
a Director of the Company at any time.

         Transfer of Option: This option and the rights and privileges conferred
hereby may not be transferred,  assigned,  pledged or hypothecated in any manner
(whether by operation of law or otherwise) other than by will, by the applicable
laws of descent and  distribution  or pursuant to the terms of a QDRO, and shall
not be subject to  execution,  attachment  or similar  process.  Any  attempt to
transfer,  assign, pledge, hypothecate or otherwise dispose of this option or of
any  right  or  privilege  conferred  hereby,  contrary  to the  Code  or to the
provisions  of this  Agreement,  or sale or levy or any  attachment  or  similar
process upon the rights and privileges conferred hereby shall be null and void.

          Vesting:  The option  shall be fully  vested  and  become  immediately
exercisable, subject to shareholder approval of the Plan.

         Holding  Period:  Shares of Common Stock  obtained upon the exercise of
this  option may not be sold until six (6) months  after the date the option was
granted.

         Date of Grant:  The date of grant of the option is __________________.

         YOUR  PARTICULAR  ATTENTION  IS DIRECTED TO ARTICLE V, SECTION 8 OF THE
PLAN WHICH DESCRIBES CERTAIN IMPORTANT  CONDITIONS RELATING TO FEDERAL AND STATE
SECURITIES  LAWS THAT MUST BE SATISFIED  BEFORE THE OPTION CAN BE EXERCISED  AND
BEFORE THE COMPANY CAN ISSUE ANY SHARES TO YOU. THE COMPANY  INTENDS TO MAINTAIN
AN  EFFECTIVE  REGISTRATION  STATEMENT  WITH  RESPECT TO THE SHARES THAT WILL BE
ISSUED UPON  EXERCISE OF THIS OPTION BUT HAS NO OBLIGATION TO DO SO. IF THERE IS
NO EFFECTIVE REGISTRATION STATEMENT, YOU WILL NOT BE ABLE TO EXERCISE THE OPTION
OR SELL THE OPTION SHARES UNLESS EXEMPTIONS FROM REGISTRATION  UNDER FEDERAL AND
STATE SECURITIES LAWS ARE AVAILABLE.  SUCH EXEMPTIONS ARE VERY LIMITED AND MIGHT
BE  UNAVAILABLE,  CONSEQUENTLY,  YOU MIGHT HAVE NO  OPPORTUNITY  TO EXERCISE THE
OPTION AND TO RECEIVE SHARES UPON SUCH EXERCISE.

         Please execute the Acceptance  and  Acknowledgement  set forth below on
the enclosed copy of this Agreement and return it to the undersigned.

                                                  Very truly yours,

                                                  AMERICAN MOBILE SATELLITE
                                                   CORPORATION



                                                  By:


Accepted and Acknowledged
this ____ day of _______________, 199__





Optionee's Signature                                 Taxpayer I.D. Number








                 NOTICE OF EXERCISE OF NONQUALIFIED STOCK OPTION


To:  American Mobile Satellite Corporation

         I, a resident  of the State of  _________________,  hereby  exercise my
nonqualified stock option granted by American Mobile Satellite  Corporation (the
"Company") on _________________,  199__, subject to all the terms and provisions
thereof and of the 1999 Stock Option Plan for Non-Employee Directors referred to
therein,  and notify  the  Company of my desire to  purchase  _______  shares of
Common  Stock  of the  Company  (the  "Securities")  at the  exercise  price  of
$____________ per share which were offered to me pursuant to said option.




Dated:





Taxpayer I.D. Number                            Optionee's Signature



                                                Address:



















                                     RECEIPT


         ___________________________________  hereby  acknowledges  receipt from
_______________________________  in payment  for  ____________  shares of Common
Stock of American  Mobile  Satellite  Corporation,  a Delaware  corporation,  of
$_______ in the form of:


/_/        Cash

Check (personal, cashier's or bank certified)

_______  shares of the  Company's  Common  Stock,  fair market value $______ per
         share held by the Optionee for a period of at least six (6) months

Copy of irrevocable instructions to Broker



Date:                               For:

                                    American Mobile Satellite Corporation