EXHIBIT 99.1

                             LETTER OF TRANSMITTAL

                     AMERICAN MOBILE SATELLITE CORPORATION
                         AMSC ACQUISITION COMPANY, INC.

      OFFER TO EXCHANGE ITS SERIES B 12 1/4 % SENIOR NOTES DUE 2008, WHICH
               HAVE BEEN REGISTERED UNDER THE SECURITIES ACT, FOR
ITS SERIES A 12 1/4 % SENIOR NOTES DUE 2008, WHICH HAVE NOT BEEN SO REGISTERED.

                 PURSUANT TO THE PROSPECTUS DATED MAY __, 1998

- --------------------------------------------------------------------------------
THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M. NEW YORK CITY TIME, ON _____, 1998
UNLESS EXTENDED (THE "EXPIRATION DATE"). TENDERS MAY BE WITHDRAWN PRIOR TO 5:00
P.M., NEW YORK CITY TIME, ON THE EXPIRATION DATE.
- --------------------------------------------------------------------------------
              STATE STREET BANK AND TRUST COMPANY, EXCHANGE AGENT



BY REGISTERED OR CERTIFIED MAIL:   BY HAND OR OVERNIGHT COURIER:       BY HAND IN BOSTON:          BY HAND OR OVERNIGHT COURIER IN 
                                                                                                      NEW YORK (AS DROP AGENT):
                                                                                           
       STATE STREET BANK                STATE STREET BANK              STATE STREET BANK                  STATE STREET BANK
       AND TRUST COMPANY                AND TRUST COMPANY              AND TRUST COMPANY                AND TRUST COMPANY N.A.
         P.O. BOX 778                 TWO INTERNATIONAL PLACE       TWO INTERNATIONAL PLACE                  61 BROADWAY
 BOSTON, MASSACHUSETTS 02102        BOSTON, MASSACHUSETTS 02110   FOURTH FLOOR, CORPORATE TRUST            FIFTEENTH FLOOR,
 CORPORATE TRUST DEPARTMENT         CORPORATE TRUST DEPARTMENT     BOSTON MASSACHUSETTS 02110          CORPORATE TRUST WINDOW
  ATTENTION: KELLIE MULLEN          ATTENTION:  KELLIE MULLEN                                         NEW YORK, NEW YORK 10006


                             CONFIRM BY TELEPHONE:
                                (617) 664-5587

       DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH
               ABOVE, OR TRANSMISSION OF INSTRUCTIONS OTHER THAN
           AS SET FORTH ABOVE, WILL NOT CONSTITUTE A VALID DELIVERY.

     The undersigned acknowledges that he or she has received and reviewed the
Prospectus, dated May ___, 1998 (the "Prospectus"), of American Mobile Satellite
Corporation ("Holdings") and AMSC Acquisition Company (the "Company") and this
Letter of Transmittal (the "Letter"), which together constitute the Company's
offer (the "Exchange Offer") to exchange up to $335,000,000 aggregate principal
amount of the Company's Series B 12 1/4 % Senior Notes Due 2008 (the "Exchange
Notes"), which have been registered under the Securities Act of 1933 (the
"Securities Act"), for a like principal amount of the Company's issued and
outstanding Series A 12 1/4 % Senior Notes Due 2008 (the "Old Notes"), which
have not been so registered.

     For each Old Note accepted for exchange, the registered holder of such Old
Note (collectively with all other registered holders of Old Notes, the
"Holders") will receive an Exchange Note having a principal amount equal to that
of the surrendered Old Note.  Registered holders of Exchange Notes on the
relevant record date for the first interest payment date following the
consummation of the Exchange Offer will receive interest accruing from the most
recent date to which interest has been paid or, if no interest has been paid,
from March 31, 1998.  Old Notes accepted for exchange will cease to accrue
interest from and after the date of consummation of the Exchange Offer.
Accordingly, Holders whose Old Notes are accepted for exchange will not receive
any payment in respect of accrued interest on such Old Notes otherwise payable
on any interest payment date the record date for which occurs on or after
consummation of the Exchange Offer.

     This Letter is to be completed by a Holder of Old Notes either if
certificates are to be forwarded herewith or if a tender of certificates for Old
Notes, if available, is to be made by book-entry transfer to the account
maintained by the Exchange Agent at The Depository Trust Company (the "Book-
Entry Transfer Facility") pursuant to the procedures set forth in "The Exchange
Offer  Procedures for Tendering" section of the Prospectus.  Holders of Old
Notes whose certificates are not immediately available, or who are unable to
deliver their certificates or confirmation of the book-entry tender of their Old
Notes into the Exchange Agent's account at the Book-Entry Transfer Facility (a
"Book-Entry Confirmation") and all other documents required by this Letter to
the Exchange Agent on or prior to the Expiration Date, must tender their Old
Notes according to the guaranteed delivery procedures set forth in "The Exchange
Offer - Guaranteed Delivery Procedures" section of the Prospectus.  See
Instruction 1.  Delivery of documents to the Book-Entry Transfer Facility does
not constitute delivery to the Exchange Agent.

THE UNDERSIGNED HAS COMPLETED THE APPROPRIATE BOXES BELOW AND SIGNED THIS LETTER
  TO INDICATE THE ACTION THE UNDERSIGNED DESIRES TO TAKE WITH RESPECT TO THE
                                EXCHANGE OFFER.

 
     PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY

Ladies and Gentlemen:

     Upon the terms and subject to the conditions of the Exchange Offer, the
undersigned hereby tenders to the Company the aggregate principal amount of Old
Notes indicated below.  Subject to, and effective upon, the acceptance for
exchange of the Old Notes tendered hereby, the undersigned hereby sells, assigns
and transfers to, or upon the order of the Company all right, title and interest
in and to such Old Notes as are being tendered hereby.

     The undersigned hereby represents and warrants that the undersigned has
full power and authority to tender, sell, assign and transfer the Old Notes
tendered hereby and that the Company will acquire good and unencumbered title
thereto, free and clear of all liens, restrictions, charges and encumbrances and
not subject to any adverse claim when the same are accepted by the Company.  The
undersigned hereby further represents that any Exchange Notes acquired in
exchange for Old Notes tendered hereby will have been acquired in the ordinary
course of business of the person receiving such Exchange Notes, whether or not
such person is the undersigned, that neither the Holder of such Old Notes nor
any such other person has an arrangement or understanding with any person to
participate in the distribution of such Exchange Notes and that neither the
Holder of such Old Notes nor any such other person is an "affiliate" (as defined
in Rule 405 under the Securities Act) of the Company.

     The undersigned also acknowledges that this Exchange Offer is being made in
reliance on interpretations by the staff of the Securities and Exchange
Commission (the "SEC"), as set forth in no-action letters issued to third
parties, that the Exchange Notes issued pursuant to the Exchange Offer in
exchange for the Old Notes may be offered for resale, resold and otherwise
transferred by a Holder thereof (other than a Holder that is an "affiliate" of
the Company within the meaning of Rule 405 under the Securities Act) without
compliance with the registration and prospectus delivery provisions of the
Securities Act, provided that such Exchange Notes are acquired in the ordinary
course of such Holder's business and such Holder has no arrangement with any
person to participate in a distribution of such Exchange Notes.  However, the
SEC has not considered the Exchange Offer in the context of a no-action letter
and there can be no assurance that the staff of the SEC would make a similar
determination with respect to the Exchange Offer as in other circumstances.  If
the undersigned is not a broker-dealer, the undersigned represents that it is
not engaged in, and does not intend to engage in, a distribution of Exchange
Notes and has no arrangement or understanding to participate in a distribution
of Exchange Notes.  If any Holder is an affiliate of the Company, is engaged in
or intends to engage in, or has any arrangement or understanding with any person
to participate in, a distribution of the Exchange Notes to be acquired pursuant
to the Exchange Offer, such Holder could not rely on the applicable
interpretations of the staff of the SEC and must comply with the registration
and prospectus delivery requirements of the Securities Act in connection with
any resale transaction.  If the undersigned is a broker-dealer that will receive
Exchange Notes for its own account in exchange for Old Notes that were acquired
as a result of market-making activities or other trading activities, it
acknowledges that it will deliver a prospectus meeting the requirements of the
Securities Act in connection with any resale of such Exchange Notes.  However,
by so acknowledging and by delivering a prospectus, the undersigned will not be
deemed to admit that it is an "underwriter" within the meaning of the Securities
Act.

     The undersigned will, upon request, execute and deliver any additional
documents deemed by the Company to be necessary or desirable to complete the
sale, assignment and transfer of the Old Notes tendered hereby.  All authority
conferred or agreed to be conferred in this Letter and every obligation of the
undersigned hereunder shall be binding upon the successors, assigns, heirs,
executors, administrators, trustees in bankruptcy and legal representatives of
the undersigned and shall not be affected by, and shall survive, the death or
incapacity of the undersigned.  This tender may be withdrawn only in accordance
with the procedures set forth in "The Exchange Offer - Withdrawal of Tenders"
section of the Prospectus.

     Unless otherwise indicated herein in the box entitled "Special Issuance
Instructions" herein, please issue the Exchange Notes (and, if applicable,
substitute certificates representing Old Notes for any Old Notes not exchanged)
in the name of the undersigned or, in the case of a book-entry delivery of Old
Notes, 

 
please credit the account indicated above maintained at the Book-Entry Transfer
Facility. Similarly, unless otherwise indicated under the box entitled "Special
Delivery Instructions" herein, please send the Exchange Notes (and, if
applicable, substitute certificates representing Old Notes for any Old Notes not
exchanged) to the undersigned at the address shown in the box herein entitled
"Description of Old Notes Delivered."

 
     THE UNDERSIGNED, BY COMPLETING THE BOX BELOW ENTITLED "DESCRIPTION OF
 OLD NOTES DELIVERED" AND SIGNING THIS LETTER, WILL BE DEEMED TO HAVE TENDERED
                      OLD NOTES AS SET FORTH IN SUCH BOX

List below the Old Notes to which this Letter relates.  If the space provided
below is inadequate, the certificate numbers and principal amount of Old Notes
should be listed on a separate signed schedule affixed hereto.



- -----------------------------------------------------------------------------------------------------------------------
                                          DESCRIPTION OF OLD NOTES DELIVERED
- -----------------------------------------------------------------------------------------------------------------------
                                                                                        
NAME(S) AND ADDRESS OF REGISTERED                                         AGGREGATE PRINCIPAL       PRINCIPAL AMOUNT
 HOLDER (PLEASE FILL IN, IF BLANK)          CERTIFICATE NUMBER(S)*              AMOUNT                 TENDERED**
- -----------------------------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------------------------
 
- -----------------------------------------------------------------------------------------------------------------------
 
- -----------------------------------------------------------------------------------------------------------------------
 
- -----------------------------------------------------------------------------------------------------------------------
 
- -----------------------------------------------------------------------------------------------------------------------
 
- -----------------------------------------------------------------------------------------------------------------------
 
- -----------------------------------------------------------------------------------------------------------------------
Totals:
- -----------------------------------------------------------------------------------------------------------------------


 *  Need not be completed if Old Notes are being tendered by book-entry
    transfer.

**  Unless otherwise indicated in this column, a holder will be deemed to have
    tendered ALL of the Old Notes represented by the listed certificates. See
    Instruction 2. Old Notes tendered hereby must be in denominations of
    principal amount of $1,000 and any integral multiple thereof. See
    Instruction 1.

[_] CHECK HERE IF TENDERED OLD NOTES ARE BEING DELIVERED PURSUANT TO A NOTICE OF
    GUARANTEED DELIVERY PREVIOUSLY SENT TO THE EXCHANGE AGENT AND COMPLETE THE
    FOLLOWING:

    Name of Tendering Institution ______________________________________________

    Account Number ____________________  Transaction Code Number _______________

[_] CHECK HERE IF TENDERED OLD NOTES ARE BEING DELIVERED PURSUANT TO A NOTICE OF
    GUARANTEED DELIVERY PREVIOUSLY SENT TO THE EXCHANGE AGENT AND COMPLETE THE
    FOLLOWING:

    Name of Registered Holder __________________________________________________

    Window Ticket Number (if any) ______________________________________________

    Date of Execution of Notice of Guaranteed Delivery _________________________

    Name of Institution Which Guaranteed Delivery ______________________________

    If Delivered by Book-Entry Transfer, Complete the Following:

    Account Number ____________________    Transaction Code Number______________

 
[_]  CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE ADDITIONAL COPIES
     OF THE PROSPECTUS AND ANY AMENDMENTS OR SUPPLEMENTS THERETO. (UNLESS
     OTHERWISE SPECIFIED, 10 ADDITIONAL COPIES WILL BE FURNISHED.)

     NAME_______________________________________________________________________

     ADDRESS____________________________________________________________________



                                                               
- ------------------------------------------------------             -------------------------------------------------------
            SPECIAL ISSUANCE INSTRUCTIONS                                     SPECIAL DELIVERY INSTRUCTIONS
             (See Instructions 3 and 4)                                         (See Instructions 3 and 4)

          To be completed ONLY if certificates for                       To be completed ONLY if certificates for Old 
  Old Notes not exchanged and/or Exchange Notes are                Notes not exchanged and/or Exchange Notes are to be 
  to be issued in the name of someone other than the               sent to someone other than the person or persons whose
  person or persons whose signature(s) appear(s) on this           signature(s) appear(s) on this Letter below or to such
  Letter below, or if Old Notes delivered by book-entry            person or persons at an address other than shown in the 
  transfer which are not accepted for exchange are to be           box entitled "Description of Old Notes Delivered" on 
  returned by credit to an account maintained at the               this Letter above.
  Book-Entry Transfer Facility other than the account 
  indicated above.  Issue Exchange Notes and/or Old                Mail Exchange Notes and/or Old Notes to: 
  Notes to:

  Name:________________________________________________            Name:__________________________________________________
                   (Please Type or Print)                                         (Please Type or Print)

  Address:_____________________________________________            Address:_______________________________________________

  _____________________________________________________            _______________________________________________________
                                       (Zip Code)                                                              (Zip Code)
 
  [_]   Credit unexchanged Old Notes delivered by
  book-entry transfer to the Book-Entry Transfer
  Facility account set forth below.
  
  ____________________________________________________
       (Book-Entry Transfer Facility Account)
- ------------------------------------------------------             -------------------------------------------------------


 
- --------------------------------------------------------------------------------
     IMPORTANT:  THIS LETTER OR A FACSIMILE HEREOF OR AN AGENCY'S MESSAGE 
    IN LIEU HEREOF (TOGETHER WITH THE CERTIFICATES FOR OLD NOTES OR A BOOK-
     ENTRY CONFIRMATION AND ALL OTHER REQUIRED DOCUMENTS OR THE NOTICE OF
  GUARANTEED DELIVERY) MUST BE RECEIVED BY THE EXCHANGE AGENT PRIOR TO 5:00 
               P.M., NEW YORK CITY TIME, ON THE EXPIRATION DATE.


               PLEASE READ THIS LETTER OF TRANSMITTAL CAREFULLY
                        BEFORE COMPLETING ANY BOX ABOVE

                               PLEASE SIGN HERE

               (All Tendering Holders Must Complete This Letter
                   And the Accompanying Substitute Form W-9)

Dated:___________, 1998

X_______________________________________________________________________________

X_______________________________________________________________________________
                                 Signature(s)

Area Code and Telephone Number:_________________________________________________

If a holder is tendering any Old Notes, this letter must be signed by the
Holder(s) as the name(s) appear(s) on the certificate(s) for the Old Notes or by
any person(s) authorized to become Holder(s) by endorsements and documents
transmitted herewith. If signature is by a trustee, executor, administrator,
guardian, officer or other person acting in a fiduciary or representative
capacity, please set forth full title. See Instruction 3.

Name:___________________________________________________________________________

________________________________________________________________________________
                            (Please Type or Print)

Capacity (full title):__________________________________________________________

Address:________________________________________________________________________

________________________________________________________________________________

Telephone:______________________________________________________________________

              SIGNATURE GUARANTEE (IF REQUIRED BY INSTRUCTION 3)

Signature(s) Guaranteed by an Eligible Institution:_____________________________
                                                       (Authorized Signature)

________________________________________________________________________________
                                    (Title)
 
________________________________________________________________________________
                                (Name and Firm)
Dated:___________________________________________________________________, 1998

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

 
                                  INSTRUCTIONS

       FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER TO EXCHANGE
   THE SERIES B 12 1/4 % SENIOR NOTES DUE 2008 OF AMERICAN MOBILE SATELLITE
                   CORPORATION AND AMSC ACQUISITION COMPANY
         WHICH HAVE BEEN REGISTERED UNDER THE SECURITIES ACT, FOR THE 
              OUTSTANDING SERIES A 12 1/4 % SENIOR NOTES DUE 2008
                      WHICH HAVE NOT BEEN SO REGISTERED.

1.   DELIVERY OF THIS LETTER AND NOTES; GUARANTEED DELIVERY PROCEDURES.

     This Letter is to be completed by Holders of Old Notes either if
certificates are to be forwarded herewith or if tenders are to be made pursuant
to the procedures for delivery by book-entry transfer set forth in "The Exchange
Offer - Procedures for Tendering" section of the Prospectus.  Certificates for
all physically tendered Old Notes, or Book-Entry Confirmation, as the case may
be, as well as a properly completed and duly executed Letter (or manually signed
facsimile hereof) and any other documents required by this Letter, must be
received by the Exchange Agent at the address set forth herein on or prior to
the Expiration Date, or the tendering holder must comply with the guaranteed
delivery procedures set forth below.  Old Notes tendered hereby must be in
denominations of principal amount of $1,000 and any integral multiple thereof.

     Holders whose certificates for Old Notes are not immediately available or
who cannot deliver their certificates and all other required documents to the
Exchange Agent on or prior to the Expiration Date, or who cannot complete the
procedure for book-entry transfer on a timely basis, may tender their Old Notes
pursuant to the guaranteed delivery procedures set forth in "The Exchange Offer
- - Guaranteed Delivery Procedures" section of the Prospectus.  Pursuant to such
procedures, (i) such tender must be made through an Eligible Institution, (ii)
on or prior to 5:00 p.m., New York City time, on the Expiration Date, the
Exchange Agent must receive from such Eligible Institution a properly completed
and duly executed Letter (or a facsimile thereof) and Notice of Guaranteed
Delivery, substantially in the form provided by the Company (by telegram, telex,
facsimile transmission, mail or hand delivery), setting forth the name and
address of the holder of Old Notes and the amount of Old Notes tendered, stating
that the tender is being made thereby and guaranteeing that within three New
York Stock Exchange ("NYSE") trading days after the date of execution of the
Notice of Guaranteed Delivery, the certificates for all physically tendered Old
Notes, in proper form for transfer, or a Book-Entry Confirmation, as the case
may be, and any other documents required by this Letter will be deposited by the
Eligible Institution with the Exchange Agent, and (iii) the certificates for all
physically tendered Old Notes, in proper form for transfer, or Book-Entry
Confirmation, as the case may be, and any other documents required by this
Letter, are deposited by the Eligible Institution within three NYSE trading days
after the date of execution of the Notice of Guaranteed Delivery.

     The method of delivery of this Letter, the Old Notes and all other required
documents is at the election and risk of the tendering Holders, but the delivery
will be deemed made only when actually received or confirmed by the Exchange
Agent.  If Old Notes are sent by mail, it is suggested that the mailing be
registered mail, properly insured, with return receipt requested, and made
sufficiently in advance of the Expiration Date to permit delivery to the
Exchange Agent prior to 5:00 p.m., New York City time, on the Expiration Date.

     See "The Exchange Offer" section of the Prospectus.

2.   PARTIAL TENDERS (NOT APPLICABLE TO NOTEHOLDERS
     WHO TENDER BY BOOK-ENTRY TRANSFER).

     If less than all of the Old Notes evidenced by a submitted certificate are
to be tendered, the tendering holder(s) should fill in the aggregate principal
amount of Old Notes to be tendered in the box above entitled "Description of Old
Notes Delivered - Principal Amount Tendered."  A reissued certificate
representing the balance of nontendered Old Notes will be sent to such tendering
Holder, unless otherwise provided in the appropriate box of this Letter,
promptly after the Expiration Date.  All of the Old Notes delivered to the
Exchange Agent will be deemed to have been tendered unless otherwise indicated.

 
3.   SIGNATURES ON THIS LETTER, BOND POWERS AND
     ENDORSEMENTS, GUARANTEE OF SIGNATURES.

     If this Letter is signed by the Holder of the Old Notes tendered hereby,
the signature must correspond exactly with the name as written on the face of
the certificates without any change whatsoever.

     If any tendered Old Notes are owned of record by two or more joint owners,
all of such owners must sign this Letter.

     If any tendered Old Notes are registered in different names on several
certificates, it will be necessary to complete, sign and submit as many separate
copies of this letter as there are different registrations of certificates.

     When this letter is signed by the Holder or Holders of the Old Notes
specified herein and tendered hereby, no endorsements of certificates or
separate bond powers are required.  If however, the Exchange Notes are to be
issued, or any untendered Old Notes are to be reissued, to a person other than
the Holder, then endorsements of any certificates transmitted hereby or separate
bond powers are required.  Signatures on such certificate(s) must be guaranteed
by an Eligible Institution.

     If this letter is signed by a person other than the Holder or Holders of
any certificate(s) specified herein, such certificate(s) must be endorsed
accompanied by appropriate bond powers, in either case signed exactly as the
name or names of the Holder or Holders appear(s) on the certificate(s) and
signatures on such certificate(s) must be guaranteed by an Eligible Institution.

     If this Letter or any certificates or bond powers are signed by trustees,
executors, administrators, guardians, attorneys-in-fact, officers of
corporations or others acting in a fiduciary or representative capacity, such
persons should so indicate when signing, and, unless waived by the Company,
proper evidence satisfactory to the Company of their authority to so act must be
submitted.

     ENDORSEMENTS ON CERTIFICATES FOR OLD NOTES OR SIGNATURES ON BOND POWERS
REQUIRED BY THIS INSTRUCTION 3 MUST BE GUARANTEED BY A FINANCIAL INSTITUTION
(INCLUDING MOST BANKS, SAVINGS AND LOAN ASSOCIATIONS AND BROKERAGE HOUSES) THAT
IS A PARTICIPANT IN THE SECURITIES TRANSFER AGENTS MEDALLION PROGRAM, THE NEW
YORK STOCK EXCHANGE MEDALLION SIGNATURE PROGRAM OR THE STOCK EXCHANGES MEDALLION
PROGRAM (EACH, AN "ELIGIBLE INSTITUTION").

     SIGNATURES ON THIS LETTER NEED NOT BE GUARANTEED BY AN ELIGIBLE
INSTITUTION, PROVIDED THE OLD NOTES ARE TENDERED:  (I) BY A REGISTERED HOLDER OF
OLD NOTES (WHICH TERM, FOR PURPOSES OF THE EXCHANGE OFFER, INCLUDES ANY
PARTICIPANT IN THE BOOK-ENTRY TRANSFER FACILITY SYSTEM WHOSE NAME APPEARS ON A
SECURITY POSITION LISTING AS THE HOLDER OF SUCH OLD NOTES) WHO HAS NOT COMPLETED
THE BOX ENTITLED "SPECIAL ISSUANCE INSTRUCTIONS" OR "SPECIAL DELIVERY
INSTRUCTIONS" ON THIS LETTER, OR (II) FOR THE ACCOUNT OF AN ELIGIBLE
INSTITUTION.

4.   SPECIAL ISSUANCE AND DELIVERY INSTRUCTIONS.

     Tendering Holders of Old Notes should indicate in the applicable box the
name and address to which Exchange Notes issued pursuant to the Exchange Offer
and/or substitute certificates evidencing Old Notes not exchanged are to be
issued or sent, if different from the name or address of the person signing this
Letter.  In the case of issuance in a different name, the employer
identification or social security number of the person named must also be
indicated.  Holders tendering Old Notes by book-entry transfer may request that
Old Notes not exchanged be credited to such account maintained at the Book-Entry
Transfer Facility as such Holder may designate hereon.  If no such instructions
are given, such Old Notes not exchanged will be returned to the name and address
of the person signing this Letter.

 
5.   TRANSFER TAXES.

     The Company will pay all transfer taxes, if any, applicable to the transfer
of Old Notes to it or its order pursuant to the Exchange Offer.  If, however,
Exchange Notes and/or substitute Old Notes not exchanged are to be delivered to,
or are to be registered or issued in the name of, any person other than the
Holder of the Old Notes tendered hereby, or if tendered Old Notes are registered
in the name of any person other than the person signing this Letter, or if a
transfer tax is imposed for any reason other than the transfer of Old Notes to
the Company or its order pursuant to the Exchange Offer, the amount of any such
transfer taxes (whether imposed on the registered holder or any other persons)
will be payable by the tendering Holder.  If satisfactory evidence of payment of
such taxes or exemption therefrom is not submitted herewith, the amount of such
transfer taxes will be billed to such tendering Holder and the Exchange Agent
will retain possession of an amount of Exchange Notes with a face amount equal
to the amount of such transfer taxes due by such tendering Holder pending
receipt by the Exchange Agent of the amount of such taxes.

     Except as provided in this Instruction 5, it will not be necessary for
transfer tax stamps to be affixed to the Old Notes specified in this Letter.

6.   WAIVER OF CONDITIONS

     The Company reserves the absolute right to waive satisfaction of any or all
conditions enumerated in the Prospectus.

7.   NO CONDITIONAL TENDERS.

     No alternative, conditional, irregular or contingent tenders will be
accepted.  All tendering Holders of Old Notes, by execution of this Letter,
shall waive any right to receive notice of the acceptance of their Old Notes for
exchange.

     Although the Company intends to notify Holders of defects or irregularities
with respect to tenders of Old Notes, neither the Company, the Exchange Agent
nor any other person shall incur any liability for failure to give any such
notice.

8.   MUTILATED, LOST, STOLEN OR DESTROYED OLD NOTES.

     Any Holder whose Old Notes have been mutilated, lost, stolen or destroyed
should contact the Exchange Agent at the address indicated above for further
instructions.

9.   WITHDRAWAL OF TENDERS.

     Tenders of Old Notes may be withdrawn at any time prior to 5:00 P.M., New
York City time, on the Expiration Date.  For a withdrawal to be effective, a
written notice of withdrawal must be received by the Exchange Agent at one of
the addresses set forth above.  Any such notice of withdrawal must specify the
name of the person having tendered the Old Notes to be withdrawn, identify the
Old Notes to be withdrawn (including the principal amount of such Old Notes),
and (where certificates for Old Notes have been transmitted) specify the name in
which such Old Notes are registered, if different from that of the withdrawing
Holder.  If certificates for Old Notes have been delivered or otherwise
identified to the Exchange Agent, then prior to the release of such certificates
the withdrawing Holder must also submit the serial numbers of the particular
certificates to be withdrawn and a signed notice of withdrawal with signatures
guaranteed by an Eligible Institution unless such Holder is an Eligible
Institution in which case such guarantee will not be required.  If Old Notes
have been tendered pursuant to the procedure for book-entry transfer described
above, any notice of withdrawal must specify the name and number of the account
at the Book-Entry Transfer Facility to be credited with the withdrawn Old Notes
and otherwise comply with the procedures of such facility.  All questions as to
the validity, form and eligibility (including time of receipt) of such notices
will be determined by the Company, whose determination will be final and binding
on all parties.  Any Old Notes so withdrawn will be deemed not to have been
validly tendered for exchange for purposes of the Exchange Offer.  Any Old Notes
which have been tendered for exchange but which are not exchanged for any 

 
reason will be returned to the Holder thereof without cost to such Holder (or,
in the case of Old Notes tendered by book-entry transfer into the Exchange
Agent's account at the Book Entry Transfer Facility pursuant to the book-entry
transfer procedures described above, such Old Notes will be credited to an
account maintained with such Book-Entry Transfer Facility for the Old Notes) as
soon as practicable after withdrawal, rejection of tender or termination of the
Exchange Offer. Properly withdrawn Old Notes may be retendered by following one
of the procedures set forth in "The Exchange Offer -- Procedures for Tendering "
set forth in the Prospectus at any time on or prior to the Expiration Date.

10.  REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES.

     Questions relating to the procedure for tendering, as well as requests for
additional copies of the Prospectus, this Letter and other related documents may
be directed to the Exchange Agent, at (617) 664-5587.

     Under current federal income tax law, a holder of Exchange Notes is
required to provide the Company (as payor) with such holder's correct taxpayer
identification number ("TIN") on Substitute Form W-9 or otherwise establish a
basis for exemption from backup withholding to prevent backup withholding on any
Exchange Notes delivered pursuant to the Exchange Offer and any payments
received in respect of the Exchange Notes.  If a holder of Exchange Notes is an
individual, the TIN is such holder's social security number.  If the Company is
not provided with the correct taxpayer identification number, a holder of
Exchange Notes may be subject to a $50 penalty imposed by the Internal Revenue
Service.  Accordingly, each prospective holder of Exchange Notes to be issued
pursuant to Special Issuance Instructions should complete the attached
Substitute Form W-9.  The Substitute Form W-9 need not be completed if the box
entitled Special Issuance Instructions has not been completed.

     Certain holders of Exchange Notes (including among others, all corporations
and certain foreign individuals) are not subject to these backup withholding and
reporting requirements.  Exempt prospective holders of Exchange Notes should
indicate their exempt status on Substitute Form W-9.  A foreign individual may
qualify as an exempt recipient by submitting to the Company, through the
Exchange Agent, a properly completed Internal Revenue Service form W-8 (which
the Exchange Agent will provide upon request) signed under penalty of perjury,
attesting to the holder's exempt status.  See the enclosed Guidelines for
Certification of Taxpayer Identification Number or Substitute Form W-9 for
additional instructions.

     If backup withholding applies, the Company is required to withhold 31% of
any payment made to the holder of Exchange Notes or other payee.  Backup
withholding is not an additional federal income tax.  Rather, the federal income
tax liability of persons subject to backup withholding will be reduced by the
amount of tax withheld.  If withholding results in an overpayment of taxes, a
refund may be obtained from the Internal Revenue Service.

PURPOSE OF SUBSTITUTE FORM W-9

     To prevent backup withholding on any Exchange Notes delivered pursuant to
the Exchange Offer and any payments received in respect of the Exchange Notes,
each prospective holder of Exchange Notes to be issued pursuant to Special
Issuance Instructions should provide the Company, through the Exchange Agent,
with either:  (i) such prospective holder's correct TIN by completing the form
below, certifying that the TIN provided on Substitute Form W-9 is correct (or
that such prospective holder is awaiting a TIN) and that (A) such prospective
holder has not been notified by the Internal Revenue Service that he or she is
subject to backup withholding as a result of a failure to report all interest or
dividends or (B) the Internal Revenue Service has notified such prospective
holder that he or she is no longer subject to backup withholding; or (ii) an
adequate basis for exemption.

WHAT NUMBER TO GIVE THE EXCHANGE AGENT

     The prospective holder of Exchange Notes to be issued pursuant to Special
Issuance Instructions is required to give the Exchange Agent the TIN (e.g.,
social security number or employer identification number) of the prospective
record owner of the Exchange Notes.  If the Exchange Notes will be held in more
than one name or are not held in the name of the actual owner, consult the
enclosed Guidelines for Certification of Taxpayer Identification Number on
Substitute Form W-9 for additional guidance regarding which number to report.

 
                   TO BE COMPLETED BY ALL TENDERING HOLDERS
                        (SEE IMPORTANT TAX INFORMATION)

              PAYOR'S NAME:  STATE STREET BANK AND TRUST COMPANY


                                                                  
- -----------------------------------------------------------------------------------------------------------------------------
                                      PART 1 - PLEASE PROVIDE                                                          
                                      YOUR TIN IN THE BOX AT           TIN:______________________________________     
                                      RIGHT OR INDICATE THAT           Social Security Number or Employer             
                                      YOU APPLIED FOR A TIN AND        Identification Number                          
                                      CERTIFY BY SIGNING AND                                                          
                                      DATING BELOW.                    TIN Applied for
                                      ---------------------------------------------------------------------------------------
SUBSTITUTE                            PART 2 - CERTIFICATION -  UNDER PENALTIES OF PERJURY, I CERTIFY                           
                                      THAT:                                                                                  
                                                                                                                             
Form W-9                              (1)  The number shown on this form is my correct Taxpayer Identification               
                                           Number (or I am waiting for a number to be issued to me);                         
Department of the Treasury            (2)  I am not subject to backup withholding either because:  (a) I am exempt from      
Internal Revenue Service                   backup withholding, or (b) I have not been notified by the Internal Revenue       
                                           Service (the "IRS") that I am subject to backup withholding as a result of a      
                                           failure to report all interest or dividends, or (c) the IRS has notified me that I 
PAYOR'S REQUEST FOR TAXPAYER               am no longer subject to backup withholding; and                                   
IDENTIFICATION NUMBER ("TIN")         (3)  any other information provided on this form is true and correct.                  
AND CERTIFICATION                                                                                                            
                                      Signature:___________________________________________          Date:__________________  
- -----------------------------------------------------------------------------------------------------------------------------
 

     You must cross out item (2) of the above certification if you have been
notified by the IRS that you are subject to backup withholding because of
underreporting of interest or dividends on your tax return and you have not been
notified by the IRS that you are no longer subject to backup withholding.

NOTE:  FAILURE BY A PROSPECTIVE HOLDER OF EXCHANGE NOTES TO BE ISSUED PURSUANT
       TO THE SPECIAL ISSUANCE INSTRUCTIONS ABOVE TO COMPLETE AND RETURN THIS
       FORM MAY RESULT IN BACKUP WITHHOLDING OF 31% OF THE EXCHANGE NOTES
       DELIVERED TO YOU PURSUANT TO THE EXCHANGE OFFER AND ANY PAYMENTS RECEIVED
       BY YOU IN RESPECT OF THE EXCHANGE NOTES. PLEASE REVIEW THE ENCLOSED
       GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION NUMBER ON
       SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.

          YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED
                    THE BOX IN PART 2 OF SUSTITUTE FORM W-9

- --------------------------------------------------------------------------------
            CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER

     I certify under penalties of perjury that a taxpayer identification number
has not been issued to me, and either (a) I have mailed or delivered an
application to receive a taxpayer identification number to the appropriate
Internal Revenue Service Center or a Social Security Administration Office or
(b) I intend to mail or deliver an application in the near future. I understand
that if I do not provide a taxpayer identification number by the time of the
exchange, 31 percent of all reportable payments made to me thereafter will be
withheld until I provide a number.
 
______________________________________         ________________________________
              Signature                                             Date

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