AMERICAN MOBILE SATELLITE CORP
10-Q, 1999-05-13
COMMUNICATIONS SERVICES, NEC
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<PAGE>






                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                  For the quarterly period ended March 31, 1999
                         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                        (Zip Code)
              executive offices)

                                 (703) 758-6000
                         (Registrant's telephone number,
                              including area code)


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

Number of shares of Common Stock outstanding at March 31, 1999: 32,303,098





<PAGE>




                          PART I-FINANCIAL INFORMATION

                          Item 1. Financial Statements

             AMERICAN MOBILE SATELLITE CORPORATION AND SUBSIDIARIES
                 CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS
                      (in thousands, except per share data)
                                   (Unaudited)



<TABLE>
<CAPTION>

                                                                                   Three Months Ended March 31,
REVENUES                                                                             1999                 1998
                                                                                     ----               ------
<S>                                                                              <C>                  <C>   
       Services                                                                   $16,164               $6,418
       Sales of equipment                                                           4,066                3,604
                                                                                  -------              -------
       Total Revenues                                                              20,230               10,022
COSTS AND EXPENSES
       Cost of service and operations                                              17,870                7,728
       Cost of equipment sold                                                       4,528                3,881
       Sales and advertising                                                        4,749                3,022
       General and administrative                                                   4,769                3,631
       Depreciation and amortization                                               13,772               10,163
                                                                                  -------              -------
       Operating Loss                                                             (25,458)             (18,403)

       INTEREST EXPENSE                                                           (15,930)              (6,638)
       INTEREST AND OTHER INCOME                                                    1,739                  141
       EQUITY IN LOSS OF XM RADIO                                                     --                  (342)
                                                                                  --------              -------
       NET LOSS                                                                  ($39,649)            ($25,242)
                                                                                 =========            =========
       BASIC AND DILUTED LOSS PER SHARE OF COMMON
       STOCK                                                                       ($1.23)              ($1.00)
       WEIGHTED-AVERAGE COMMON SHARES
       OUTSTANDING DURING THE PERIOD (000'S)                                       32,225               25,241
</TABLE>

See notes to consolidated condensed financial statements.

                                       -1-

<PAGE>



                          PART I-FINANCIAL INFORMATION
                    Item 1. Financial Statements (continued)
             AMERICAN MOBILE SATELLITE CORPORATION AND SUBSIDIARIES
                      CONSOLIDATED CONDENSED BALANCE SHEETS
                                   (Unaudited)

<TABLE>
<CAPTION>

(In thousands)                                                         March 31,         December 31,
ASSETS                                                                      1999                 1998
CURRENT ASSETS
<S>                                                                     <C>                  <C>   
      Cash and cash equivalents                                           $8,131               $2,285
      Inventory                                                           17,440               18,593
      Prepaid in-orbit insurance                                           1,932                3,381
      Accounts receivable - net                                           16,752               15,325
      Restricted short-term investments                                   41,038               41,038
      Note receivable from XM Radio                                       21,687                   --
      Other current assets                                                15,055               13,231
                                                                          ------               ------
           Total current assets                                          122,035               93,853
PROPERTY & EQUIPMENT - net                                               239,017              246,553
GOODWILL & INTANGIBLES  - net                                             52,772               53,235
RESTRICTED INVESTMENTS                                                    68,623               67,199
DEFERRED CHARGES & OTHER ASSETS - net                                     26,151               28,954
                                                                          ------               ------
          Total assets                                                  $508,598             $489,794
                                                                        ========             ========
</TABLE>


      See notes to consolidated financial statements.


                                       -2-

<PAGE>



<TABLE>
<CAPTION>

(In thousands)                                                         March 31,         December 31,
LIABILITIES & STOCKHOLDERS' DEFICIT                                         1999                 1998

CURRENT LIABILITIES
<S>                                                                     <C>                  <C>    
      Accounts payable & accrued expenses                                $41,839              $33,797
      Obligations under capital leases due within one year                 4,816                5,971
      Vendor financing due to related party within one year                1,569                  543
      year
      Deferred trade payables due within one year                          2,584                4,498
      Other current liabilities                                              --                   162
                                                                        ---------            ---------
           Total current liabilities                                      50,808               44,971
LONG-TERM LIABILITIES
      Obligations under New Bank Financing                               159,000              132,000
      Obligations under Notes, net of discount                           327,359              327,147
      Capital lease obligations                                            5,657                5,824
      Net assets acquired in excess of purchase price                      1,855                2,028
      Vendor financing due to related party                                3,031                1,069
      Note payable to related party                                       21,769                   --
      Deferred trade payables                                                442                  620
      Other long-term liabilities                                            535                  540
                                                                        ---------            ---------
           Total long-term liabilities                                   519,648              469,228
                                                                        ---------            ---------
           Total liabilities                                             570,456              514,199
STOCKHOLDERS' DEFICIT
      Preferred Stock                                                         --                   --
      Common Stock                                                           324                  322
      Additional paid-in capital                                         509,074              508,084
      Deferred compensation                                               (2,305)              (1,528)
      Common Stock purchase warrants                                      60,588               59,108
      Unamortized guarantee warrants                                     (33,177)             (33,678)
      Cumulative loss                                                   (596,362)            (556,713)
                                                                        ---------            ---------
           Total stockholders' deficit                                   (61,858)             (24,405)
                                                                        ---------            ---------
           Total liabilities and stockholders' deficit                  $508,598             $489,794
                                                                        =========            =========

</TABLE>

See notes to consolidated financial statements.

                                       -3-

<PAGE>



                          PART I-FINANCIAL INFORMATION
                    Item 1. Financial Statements (continued)

             AMERICAN MOBILE SATELLITE CORPORATION AND SUBSIDIARIES
                 CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS
                                 (in thousands)
                                   (Unaudited)
<TABLE>
<CAPTION>

                                                                            Three Months Ended
                                                                                  March 31
                                                                              1999        1998
                                                                              ----        ----

CASH FLOWS FROM OPERATING ACTIVITIES:
<S>                                                                      <C>          <C>      
Net loss                                                                  ($39,649)   ($25,242)
Adjustments to reconcile net loss 
to net cash used in operating activities:
  Amortization of guarantee warrants, debt discount 
     and issuance costs                                                      4,552       2,524
  Depreciation and amortization                                             13,772      10,163
  Equity in loss in XM Radio                                                    --         342
  Changes in assets and liabilities:
     Inventory                                                               1,153       1,986
     Prepaid in-orbit insurance                                              1,449       1,675
     Trade accounts receivable                                              (1,427)      3,744
     Other current assets                                                   (1,369)       (661)
     Accounts payable and accrued expenses                                   8,568     (12,197)
     Deferred trade payables                                                (2,092)      6,436
     Deferred items - net                                                     (931)        293
                                                                         ----------   ---------
Net cash used in operating activities                                      (15,974)    (10,937)

CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property and equipment                                         (2,541)     (1,126)
Purchase of XM Radio note receivable                                       (21,419)         --
Acquisition of ARDIS                                                            --     (51,382)
Purchase of long-term, restricted investments                               (1,424)   (140,892)
                                                                         ----------   ---------
Net cash used in investing activities                                      (25,384)   (193,400)

CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of Common Stock                                         162         103
Principal payments under capital leases                                     (1,322)       (135)
Principal payments under Vendor Financing                                      (90)         --
Proceeds from New Bank Financing                                            27,000       2,000
Proceeds from note payable to related party                                 21,500          --
Repayment of Bank Financing                                                     --    (100,000)
Proceeds from bridge financing                                                  --      10,000
Repayment of bridge financing                                                   --     (10,000)
Proceeds from Notes and Stock Purchase Warrants                                 --     335,000
Debt issuance costs                                                            (46)    (13,458)
                                                                         ----------   ---------
Net cash provided by financing activities                                   47,204     223,510


Net increase in cash and cash equivalents                                    5,846      19,173


CASH AND CASH EQUIVALENTS, beginning of period                               2,285       2,106
                                                                         ----------   ---------


CASH AND CASH EQUIVALENTS, end of period                                    $8,131     $21,279
                                                                         ==========   =========

</TABLE>


See notes to consolidated financial statements.

                                       -4-

<PAGE>

                          PART I-FINANCIAL INFORMATION

                    Item 1. Financial Statements (continued)
             AMERICAN MOBILE SATELLITE CORPORATION AND SUBSIDIARIES
              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS

                                 March 31, 1999
                                   (Unaudited)


1. Organization and Business

American Mobile Satellite Corporation (with its subsidiaries,  "American Mobile"
or the "Company") is a nationwide provider of wireless communications  services,
including data, dispatch, and voice services, primarily to business customers in
the United States.

Additionally,  the Company has an investment in XM Satellite Radio Inc.,  which,
through its  subsidiary  XM Satellite  Radio  Holdings  Inc.  (together  with XM
Satellite Radio Inc., "XM Radio"),  is one of two entities  awarded a license by
the  FCC  to  provide  satellite-based  Digital  Audio  Radio  Service  ("DARS")
throughout  the  United  States.  XM Radio is  currently  engaged  in efforts to
construct  its  satellite  system.  The  Company's  investment  in XM  Radio  is
currently  not  material  to  the  Company's  financial  position,   results  of
operations or cash flows.  The Company is not required to provide any additional
funding.

American  Mobile is devoting its efforts to expanding its business.  This effort
involves  substantial  risk.  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.

2.  Significant Accounting Policies

Basis of Presentation

The unaudited  consolidated  condensed financial statements included herein have
been  prepared  pursuant  to the rules and  regulations  of the  Securities  and
Exchange  Commission.  Certain  information  and footnote  disclosures  normally
included in financial  statements prepared in accordance with generally accepted
accounting principles have been condensed or omitted. While the Company believes
that the  disclosures  made are adequate to make the information not misleading,
these consolidated  financial  statements should be read in conjunction with the
consolidated  financial  statements  and related notes included in the Company's
1998 Annual Report on Form 10-K

The  consolidated  balance  sheet as of March  31,  1999,  and the  consolidated
statements  of  operations  and cash flows for the three  months ended March 31,
1999 and 1998,  have been prepared by the Company  without audit. In the opinion
of management,  all  adjustments  (consisting of normal  recurring  adjustments)
necessary to present  fairly the financial  position,  results of operations and
cash flows at March 31, 1999, and for all periods  presented have been made. The
balance  sheet at December  31,  1998 has been taken from the audited  financial
statements.

                                      -5-

<PAGE>

Net Loss Per Share

Basic and diluted loss per common share is based on the weighted-average  number
of shares of Common  Stock  outstanding  during the  period.  Stock  options and
common stock  purchase  warrants are not  reflected  since their effect would be
antidilutive.  As of March 31, 1999, there were approximately 84,000 options and
warrants  that would have been included in this  calculation  had the effect not
been antidilutive.

Comprehensive Income

SFAS No.  130,  "Reporting  of  Comprehensive  Income"  requires  "comprehensive
income" and the components of "other comprehensive income" to be reported in the
financial  statements and/or notes thereto.  Since the Company does not have any
components of "other  comprehensive  income," reported net income is the same as
"comprehensive income" for the three months ended March 31, 1999 and 1998.

Segment Disclosures

In accordance  with SFAS 131,  "Disclosures  about Segments of an Enterprise and
Related  Information,"  the  Company  has only one  operating  segment  which is
engaged in the  provision  of  nationwide  wireless  communication.  The Company
provides  services  within  North  America and parts of Central  America and the
Caribbean, and all revenues are derived from customers within the United States.
The following summarizes service revenue by major product lines:

<TABLE>
<CAPTION>

                                              Revenue for the
                                            Three Months Ended
                                                 March 31,
<S>                                          <C>          <C> 
(in millions)                                1999         1998
                                             ----         ----
Voice Service                                $3.0         $3.2
Data Service                                 12.0          2.3
Capacity Resellers and Other                  1.2          0.9
</TABLE>



                                       -6-

<PAGE>
Recently Adopted Accounting Pronouncements

In June  1998,  FASB  issued  Statement  No.  133,  "Accounting  for  Derivative
Instruments  and Hedging  Activities,"  which  requires the  recognition  of all
derivatives  as either  assets  or  liabilities  measured  at fair  value.  This
statement is effective for year ending  December 31, 2000.  The Company does not
believe that the adoption of this statement  will have a material  impact on its
financial position, results of operations and cash flows.

In March 1999, FASB issued an Exposure Draft on an  Interpretation of Accounting
Principles  Board Opinion No. 25 Accounting for Certain  Transactions  involving
Stock Compensation.  This proposed Interpretation would make it more likely that
expense  would be required to be  recognized in the case of, among other things,
stock  (including  stock options) issued to non-employee  members of an entity's
board of  directors.  The  Company  has  assessed  the  impact of this  proposed
Interpretation and does not believe that adoption of this  Interpretation  would
have a material impact on its financial position, results of operations and cash
flows.

Other

The Company paid  approximately $2.1 million and $1.5 million in the three-month
periods  ended March 31,  1999 and 1998,  respectively,  to related  parties for
capital assets,  service-related  obligations,  and payments under  pre-existing
financing  agreements.  There  were no  payments  from  related  parties  in the
three-month  period  ended  March 31,  1999,  as  compared  to $1.1  million for
communication  services and equipment  purchases in the three-month period ended
March 31,  1998.  Total  indebtedness  to related  parties as of March 31,  1999
approximated  $27.5 million,  with amounts due from related  parties as of March
31, 1999 totaling $21.7 million.

3.  Liquidity and Financing

Liquidity and Financing Requirements

Adequate  liquidity  and capital are  critical  for the Company to continue as a
going concern and to fund subscriber  acquisition  programs necessary to achieve
positive cash flow 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.

On March 31, 1998, AMSC Acquisition Company,  Inc.  ("Acquisition  Company"),  a
wholly-owned  subsidiary of American Mobile Satellite  Corporation,  issued $335
million  of units  consisting  of 12 1/4%  Senior  Notes due 2008  (the  "Senior
Notes"),  and one  warrant to  purchase  3.75749  shares of Common  Stock of the
Company for each $1,000 principal amount of Senior Notes (the  "Warrants"),  and
also  restructured its existing bank financing (the "New Bank  Financing").  The
New  Bank  Financing  of  $200  million  consists  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. Additionally, on March 29, 1999, the Bank
Facility  Guarantors  (as  defined in Item 2 under the  caption  "Liquidity  and
Capital  Resources")  agreed to  eliminate  certain  covenants  relating  to the
Company's future earnings before interest, depreciation,  amortization and taxes
("EBITDA") and service  revenue.  In exchange for this elimination of covenants,
the Company  agreed to reprice  their  Guarantee  Warrants (as defined in Item 2
under the caption "Liquidity and Capital  Resources"),  effective April 1, 1999,
from $12.51 to $7.50. The value of the repricing was approximately $1.5 million.
As of April 30, 1999,  the Company had $41.0  million  available  for  borrowing
under the  Revolving  Credit  Facility.  Additionally,  Motorola  has  agreed to
provide the  Company  with up to $10 million of vendor  financing  (the  "Vendor
Financing Commitment"),  which is available to finance up to 75% of the purchase
price of additional base stations  needed to meet ARDIS'  buildout  requirements
under  certain  customer  contracts.  As of March 31,  1999,  $4.6  million  was
outstanding under this facility.

                                       -7-

<PAGE>

The Company's  current  operating  assumptions  and  projections,  which reflect
management's  best  estimate  of  subscriber  and revenue  growth and  operating
expenses,  indicate that anticipated  capital  expenditures,  operating  losses,
working capital and debt service  requirements  through 1999, and beyond, can be
met by cash flows from  operations,  the net proceeds  from the sale of the $335
million Senior Notes and Warrants,  together with the borrowings  under the $200
million New Bank Financing,  the Vendor Financing  Commitment and deferred terms
on  certain  trade  payables;   however,  the  Company's  ability  to  meet  its
projections is subject to numerous  uncertainties  and 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 if the Company's cash
requirements  are more  than  projected,  the  Company  may  require  additional
financing  in  amounts  which may be  material.  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 available on favorable terms.

XM Radio

As previously  mentioned (see  "Organization and Business"),  the Company has an
investment  in XM  Satellite  Radio  Inc.,  which,  through  its  subsidiary  XM
Satellite  Radio  Holdings  Inc.  (together  with XM  Satellite  Radio Inc., "XM
Radio"),  is one  of two  entities  awarded  a  license  by the  FCC to  provide
satellite-based  Digital  Audio Radio  Service  ("DARS")  throughout  the United
States.  XM Radio is  currently  engaged in efforts to construct  its  satellite
system.  The  Company's  investment in XM Radio is currently not material to the
Company's financial  position,  results of operations or cash flows. The Company
is not required to provide any additional  funding.

On January 15, 1999,  the Company  issued to Baron Asset Fund  ("Baron") a $21.5
million  note  convertible  into shares of XM Radio  common stock (the "Baron XM
Radio Convertible Note"). The Company  subsequently  loaned  approximately $21.4
million to XM Radio in exchange for XM Radio common stock and a note convertible
into XM Radio  shares  (the "XM  Radio  Note  Receivable").  The  Baron XM Radio
Convertible Note ranks subordinate to all other securities of the Company and is
fully  collateralized  by  approximately  one-half of the shares received by the
Company  as a result of this  transaction.  The XM Radio  Note  Receivable  is a
non-recourse note and is exchangeable into  approximately half of the additional
XM Radio  common  stock to be received by the Company as a result of the January
15 transaction.  Assuming  conversion of all  convertible  notes and exercise of
outstanding  options to purchase XM Radio common stock held by World Space,  the
Company's  ownership  in XM Radio would be 22.6%.  The XM Radio Note  Receivable
earns  interest at LIBOR plus 5% and is due on the  September  30, 2006 maturity
date, and the Baron XM Radio Convertible Note accrues interest at the rate of 6%
annually,  with all  payments  deferred  until  maturity  or  extinguished  upon
conversion. The Company has the option to satisfy the Baron XM Radio Convertible
Note by tendering the shares into which it would have been  convertible  in lieu
of any cash payments.



                                       -8-

<PAGE>
Summarized financial  information for XM Radio as of March 31, 1999, and for the
three months ended March 31, 1999 and 1998, and for the period from December 15,
1992 (date of inception) through March 31, 1999 is set forth below.

<TABLE>
<CAPTION>

                                                                                           December 15, 1992
                                                                       Three Months             through
dollars in thousands                                                  Ended March 31,          March 31,
                                                                  1999             1998           1999
                                                                  ----             ----          -----
<S>                                                             <C>              <C>            <C>    
Gross sales                                                     $   --           $   --         $    --
Operating expenses                                               4,421            1,367          21,724
Loss from operations                                             4,421            1,367          21,724
Interest expense                                                   (55)              39             468
Net loss                                                         4,366            1,406          22,192
</TABLE>

<TABLE>
<CAPTION>
                                                                            As of                As of
                                                                          March 31,           December 31,
                                                                             1999                 1998
                                                                          ---------           ------------
<S>                                                                       <C>                  <C>     
Current assets                                                            $  4,401             $    482
Noncurrent assets                                                          218,804              170,003
Current liabilities                                                        155,842              130,823
Noncurrent liabilities                                                      78,913               46,845
Total stockholders' deficit                                                (11,550)              (7,183)
</TABLE>


4. Legal and Regulatory Matters

The  ownership  and  operation  of the  mobile  satellite  services  system  and
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 the spectrum.  American  Mobile  operates
pursuant to various licenses granted by the FCC.

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 its 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.

                                      -9-


<PAGE>

There are applications now pending before the FCC to use the Inmarsat system and
TMI's  Canadian-licensed  system,  both of which operate in the Mobile Satellite
Services  ("MSS")  L-band  and have  satellite  footprints  covering  the United
States,  to provide  service in the United States.  American  Mobile has opposed
these  filings.  In addition to  providing  additional  competition  to American
Mobile,  a grant of domestic  authority  by the FCC to use any of these  foreign
systems  may  increase  the  demand  by  these   systems  for  spectrum  in  the
international  coordination process and could adversely affect American Mobile's
ability to coordinate its spectrum access.

On July 20, 1998, the International Bureau of the FCC granted an application for
Special Temporary Authority ("STA") to use TMI's space segment to conduct market
tests in the U.S. for six months using up to 500 mobile  terminals.  On July 30,
1998,  American  Mobile filed an Application for Review and a Motion for Stay of
this STA grant with the FCC, and these filings remain  pending.  On December 18,
1998,  SatCom filed a request for a six-month  extension of this STA,  which was
extended to July 12, 1999.

American Mobile is authorized to build, launch, and operate three geosynchronous
satellites in accordance  with a specific  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
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 authorization for MSAT-2 is likely to be extended in
due course to  correspond  to the useful life of the satellite and a new license
granted for any replacement satellites,  there is no assurance of such extension
or grants.




                                       -10-

<PAGE>

5.  Commitments

At March 31, 1999, the Company had remaining contractual commitments to purchase
both  mobile data  terminal  inventory  and mobile  telephone  inventory  in the
maximum  amount of $12.0  million  during  1999.  Additionally,  the Company had
remaining contractual  commitments in the amount of $635,000 for the development
of certain  next  generation  data  terminals.  Contingent  upon the  successful
research and  development  efforts,  the Company  would have maximum  additional
contractual commitments for mobile communications data terminal inventory in the
amount of $27.0 million over a three-year  period  starting in 1999. The Company
has the right to terminate the research and development and inventory commitment
by paying cancellation fees of between $1 million and $2.5 million, depending on
when the termination  option is exercised  during the term of the contract.  The
Company also has the right to terminate the inventory  commitment by incurring a
cancellation penalty representing a percentage of the unfulfilled portion of the
contract.  The Company has also  contracted for the purchase of $26.2 million of
next generation wireless data terminals to be delivered beginning mid-1999.  The
contract  contains a 50%  cancellation  penalty.  Additionally,  the Company has
remaining contractual  commitments for the purchase of $392,000 of base stations
required to complete  certain  necessary site  build-outs,  and $1.2 million for
certain software development.

6.  AMSC Acquisition Company Financial Statements

In connection with the Company's acquisition of ARDIS Company in March 1998 (the
"Acquisition")  and related financing  discussed above, the Company formed a new
wholly-owned subsidiary, AMSC Acquisition Company, Inc. ("Acquisition Company").
The  Company   contributed  all  of  its  inter-company  notes  receivables  and
transferred  its rights,  title and  interests in AMSC  Subsidiary  Corporation,
American Mobile Satellite Sales Corporation, and AMSC Sales Corp. Ltd. (together
with ARDIS, the "Subsidiary Guarantors") to Acquisition Company, and Acquisition
Company was the  acquirer of ARDIS and the issuer of the $335  million of Notes.
American Mobile Satellite Corporation  ("American Mobile Parent") is a guarantor
of the Notes. The Notes contain  covenants that,  among other things,  limit the
ability  of  Acquisition  Company  and  its  Subsidiaries  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.

Acquisition Company is a holding company with no material  operations.  It holds
the Senior  Notes and  Revolving  Credit  Facility,  both of which are fully and
unconditionally  guaranteed  on  a  joint  and  several  basis  by  all  of  its
subsidiaries,   and  holds  the   inter-company   notes   receivable   from  its
subsidiaries. Separate company financial statements for Acquisition Company have
not  been  prepared,   as  management   believes  the  differences  between  the
Acquisition Company and the Subsidiary  Guarantors  statements to be immaterial,
and therefore not material information to the investors.


                                       -11-

<PAGE>
Summarized  financial  information  with  respect  to  American  Mobile  Parent,
Acquisition Company and with respect to the Subsidiary  Guarantors on a combined
basis as of March 31,  1999 and for the three  months  ended  March 31, 1999 and
1998 is as follows (unaudited):

<TABLE>
<CAPTION>
                                              American Mobile Parent                     Acquisition Company
                                           Three months Ended March 31,              Three Months Ended March 31,
Operating Statement Data                    1999                 1998                  1999                  1998
                                            ----                 ----                 -----                 ----
(in thousands)
<S>                                     <C>                  <C>                   <C>                      <C> 
Net Revenue                             $    300             $    300              $     --                 $ --
Equity in loss of subsidiaries           (37,197)             (32,613)              (29,818)                  --
Operating income (loss)                      110                  526                   190                   --
Net loss                                 (39,649)              25,242               (37,197)                  --
</TABLE>

<TABLE>
<CAPTION>
                                                               As of                                      As of
Balance Sheet Data                                         March 31, 1999                             March 31, 1999
                                                           --------------                             --------------
(in thousands)
<S>                                                          <C>                                        <C>     
Current assets                                               $ 27,651                                   $ 41,038
Non-current assets                                             34,182                                    394,009
Current liabilities                                               421                                     20,988
Non-current liabilities                                       123,270                                    386,359
Shareholders' (Deficit) Equity                                (61,858)                                    27,700
</TABLE>



<TABLE>
<CAPTION>

                                                                Combined Subsidiary Guarantors
                                                                 Three Months Ended March 31,
Operating Statement Data                                          1999                  1998
                                                                  ----                  ----
(in thousands)
<S>                                                           <C>                   <C>     
Net Revenue                                                   $ 20,230              $ 10,022
Equity in loss of subsidiaries                                      --                    --
Operating loss                                                 (25,758)              (18,928)
Net loss                                                       (29,818)              (32,613)
</TABLE>


<TABLE>
<CAPTION>

                                                                                      As of
Balance Sheet Data                                                               March 31, 1999
                                                                                 --------------
(in thousands)
<S>                                                                                 <C>     
Current assets                                                                      $ 53,346
Non-current assets                                                                   312,901
Current liabilities                                                                   29,399
Non-current liabilities                                                              728,449
Shareholders' Deficit                                                               (391,601)
</TABLE>

                                      -12-

<PAGE>

Major  differences  between the financial  statements of Parent and  Acquisition
Company include (i) the Term Loan Facility which, as of the  Acquisition,  is an
obligation of Parent and, as such,  the related debt and interest  costs are not
included in the Acquisition  Company financial  statements for the periods ended
and as of March 31, 1999, and (ii) certain immaterial  inter-company  management
fees and expenses between the Parent and Acquisition  Company are not eliminated
at the Acquisition Company level.

The consolidated condensed unaudited financial statements of Acquisition Company
are set forth below.

                                      -13-
<PAGE>

                         AMSC Acquisition Company, Inc.
                   Combined Condensed Statements of Operations
                             (dollars in thousands)
                                   (Unaudited)


<TABLE>
<CAPTION>
                                                                Three Months Ended
                                                                    March 31,
                                                                1999          1998
                                                                ----          ----
REVENUES

<S>                                                         <C>           <C>   
       Services                                              $16,164        $6,418
       Sales of equipment                                      4,066         3,604
                                                               -----         -----

       Total Revenues                                         20,230        10,022


COSTS AND EXPENSES:

       Cost of service and operations                         17,870         7,728
       Cost of equipment sold                                  4,528         3,881
       Sales and advertising                                   4,749         2,993
       General and administrative                              4,879         3,659
       Depreciation and amortization                          13,772        10,689
                                                              ------        ------

       Operating Loss                                        (25,568)      (18,928)


INTEREST AND OTHER  INCOME                                     1,181           141
INTEREST EXPENSE                                             (12,810)      (13,826)
                                                             --------      --------


NET LOSS                                                    $(37,197)     $(32,613)
                                                            =========     =========


</TABLE>




                                      -14-

<PAGE>



                         AMSC Acquisition Company, Inc.
                        Combined Condensed Balance Sheets
                             (dollars in thousands)
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                                                 March 31,        December 31,
ASSETS                                                                             1999               1998
                                                                                   ----               ----
CURRENT ASSETS:
<S>                                                                               <C>                <C>   
      Cash and cash equivalents                                                     $8,131             $2,285
      Inventory                                                                     17,440             18,593
      Accounts receivable                                                           16,752             15,325
      Restricted short-term investments                                             41,038             41,038
      Prepaid in-orbit insurance                                                     1,932              3,381
      Other current assets                                                           9,091              7,212
                                                                                     -----              -----
             Total current assets                                                   94,384             87,834

PROPERTY AND EQUIPMENT - NET                                                       239,017            246,553
GOODWILL - NET                                                                      52,772             56,439
RESTRICTED INVESTMENTS                                                              57,678             53,235
DEFERRED CHARGES AND OTHER ASSETS - NET                                             32,672             33,846
                                                                                    ------             ------

             Total assets                                                         $476,523           $477,907
                                                                                  ========           ========

LIABILITIES AND STOCKHOLDERS' EQUITY


CURRENT LIABILITIES:

      Accounts payable and accrued expenses                                        $41,418            $33,718
      Obligations under capital leases due within one year                           4,816              5,971
      Current portion of long-term debt                                              4,153              5,041
      Other current liabilities                                                         --                162
                                                                                   -------                ---
             Total current liabilities                                              50,387             44,892


DUE TO PARENT                                                                          557                 --



LONG-TERM LIABILITIES:

      Obligations under New Bank Financing                                          59,000             32,000
      Senior Notes, net of discount                                                327,359            327,147
      Capital lease obligations                                                      5,657              5,824
      Other long-term debt                                                           3,473              1,689
      Net assets acquired in excess of purchase price                                1,855              2,028
      Other long-term liabilities                                                      535                540
                                                                                       ---                ---

             Total long-term liabilities                                           397,879            369,228

             Total liabilities                                                     448,823            414,120
                                                                                   -------            -------


STOCKHOLDERS' EQUITY                                                                27,700             63,787
                                                                                    ------             ------


             Total liabilities and stockholders' equity                           $476,523           $477,907
                                                                                  ========           ========

</TABLE>


                                      -15-

<PAGE>



                         AMSC Acquisition Company, Inc.
                   Combined Condensed Statements of Cash Flows
                             (dollars in thousands)
                                   (Unaudited)


<TABLE>
<CAPTION>
                                                                     Three Months Ended
                                                                         March 31,
                                                                     1999           1998
                                                                     ----           ----
CASH FLOWS USED IN OPERATING ACTIVITIES:
<S>                                                               <C>            <C>      
Net loss                                                          $(37,197)      $(32,613)
Adjustments to reconcile net loss to net cash used in
operating activities:
             Amortization of debt discount                           1,786          2,524
             Depreciation and amortization                          13,772         10,689
             Changes in assets and liabilities:
                 Inventory                                           1,153          1,986
                 Prepaid in-orbit insurance                          1,449          1,675
                 Trade accounts receivable                          (1,427)         3,744
                 Other current assets                               (1,424)          (661)
                 Accounts payable and accrued expenses               8,147        (12,182)
                 Deferred trade payables                            (2,092)         6,436
                 Deferred items - net                                 (542)           293
                                                                   --------       --------

Net cash used in operating activities                              (16,375)       (18,109)



Additions to property and equipment                                 (2,541)        (1,126)
Acquisition of ARDIS                                                    --        (51,382)
Purchase of long-term restricted cash securities                    (1,239)      (113,000)
                                                                   --------      ---------

Net cash used in investing activities                               (3,780)      (165,508)

CASH FLOWS FROM FINANCING ACTIVITIES:

Funding from Parent                                                    413        (12,127)
Principal payments under capital leases                             (1,322)          (135)
Proceeds from Bank Financing                                        27,000          2,000
Repayment of Bank Financing                                             --       (100,000)
Proceeds from bridge financing                                          --         10,000
Repayment of bridge financing                                           --        (10,000)
Proceeds from Senior Notes                                              --        326,510
Principal payments under vendor Financing                              (90)            --
Debt issuance costs                                                     --        (13,458)
                                                                    -------       --------

Net cash provided by  financing activities                          26,001        202,790

Net increase in cash and cash equivalents                            5,846         19,173

CASH AND CASH EQUIVALENTS, beginning of period                       2,285          2,106
                                                                    -------       --------
CASH AND CASH EQUIVALENTS, end of period                            $8,131        $21,279
                                                                    =======       ========

</TABLE>




                                      -16-

<PAGE>



                          PART I-FINANCIAL INFORMATION

                 Item 2. Management's Discussion and Analysis of
                  Financial Condition and Results of Operations

This Quarterly Report on Form 10-Q 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 Quarterly  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  Quarterly  Report,   including,   without  limitation,   in
conjunction  with the  forward-looking  statements  included  in this  Quarterly
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 Form 10-K Annual Report filed on March 30, 1999, the  Registration
Statement on Form S-3,  No.  333-71423,  filed on March 30, 1999,  and Form 10-Q
Quarterly  Reports  to be filed by the  Company  subsequent  to this  Form  10-Q
Quarterly 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.

The Company 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  (the "ARDIS  Network")  and a satellite in
geosynchronous orbit (the "Satellite Network") (together, the "Network").

The Company and its  subsidiaries  are parties to the following  financings  and
refinancings:  (1) $335 million of Senior  Notes due 2008 (the "Senior  Notes");
(2)  the  $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 "Liquidity and Capital Resources."

                                      -17-

<PAGE>

XM  Radio  is one of two  entities  awarded  a  license  by the  FCC to  provide
satellite-based  Digital  Audio Radio  Service  ("DARS")  throughout  the United
States.  XM Radio is  currently  engaged in efforts to construct  its  satellite
system and negotiate contracts with third party vendors and other partners.  The
operations and financing of XM Radio are maintained  separate and apart from the
operations  and  financing  of  American  Mobile  (see  "Liquidity  and  Capital
Resources").  Through its  investment in XM Radio,  WorldSpace  has an option to
increase its ownership in XM Radio subject to FCC approval.  On October 30, 1998
the Company  and  WorldSpace  jointly  filed an  application  for consent to the
transfer of control of XM Radio in  anticipation of future exercise of the World
Space options.  On January  15,1999,  the Company  provided an additional  $21.4
million of  convertible  financing  for XM Radio  through an issuance of a $21.5
million subordinated,  non-recourse note of the Company to Baron Asset Fund. The
Company's  note issued to Baron Asset Fund is  exchangeable  into  approximately
half of the  additional XM Radio common stock to be received by the Company as a
result of the January 15  transaction.  Assuming  conversion of all  convertible
notes  and  exercise  of  the  outstanding  WorldSpace  options,  the  Company's
ownership in XM Radio would be 22.6%.

Given  the  acquisition  of  ARDIS,  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.

Overview

The Company 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  the  Networks  and the cost of  developing,
selling  and  providing  its  products  and  services.  The Company is, and will
continue to be, highly leveraged.

The Company's future operating  results could be adversely  affected by a number
of uncertainties and factors, including:

                                      -18-

<PAGE>



         (a)      the timely  completion and  deployment of future  products and
                  related services,  including among other things,  availability
                  of an adequate supply 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,
         (b)      the market's acceptance of the Company's services,
         (c)      the ability and the  commitment of the Company's  distribution
                  channels to market and distribute the Company's services,
         (d)      the Company's ability to modify its organization, strategy and
                  product mix to maximize the market  opportunities  in light of
                  changes therein,
         (e)      competition  from  existing  companies  that provide  services
                  using existing communications technologies and the possibility
                  of  competition  from  companies  using new  technology in the
                  future,
         (f)      capacity  constraints  arising  from  the  reconfiguration  of
                  MSAT-2,   subsequent  anomalies  affecting  MSAT-2,  or  power
                  management   recommendations   affecting   MSAT-2,   each   as
                  previously reported,
         (g)      additional  technical  anomalies  that may  occur  within  the
                  Satellite Network,  including those relating to MSAT-2,  which
                  could  impact,  among  other  things,  the  operation  of  the
                  Satellite  Network  and the  cost,  scope or  availability  of
                  in-orbit insurance,
         (h)      subscriber  equipment  inventory  commitments  assumed  by the
                  Company  including  the  ability of the Company to realize the
                  value of its inventory in a timely manner,
         (i)      the  Company's   ability  to  fund  its  anticipated   capital
                  expenditures,  operating losses and debt service  requirements
                  and its  ability  to  secure  additional  financing  as may be
                  necessary,
         (j)      the  Company's  ability to respond and react to changes in its
                  business  and  the  industry  as  a  result  of  being  highly
                  leveraged,
         (k)      the  timely  roll-out  of certain key customer initiatives and
                  products,
         (l)      the ability of the Company to successfully integrate ARDIS and
                  to achieve certain business synergies, and
         (m)      the ability of the Company to manage growth effectively.

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.  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 equipment sales will not be encountered in
the future and will not have an adverse impact on the Company.

As of March 31, 1999, there were approximately 113,000 units on the Network.

                                      -19-

<PAGE>



Three Months Ended March 31, 1999 and 1998

Service  revenues,  which  includes both the Company's  voice and data services,
approximated $16.2 million for the three months ended March 31, 1999, which is a
$9.8 million,  or 153%,  increase over the same period in 1998. The  significant
increase in service  revenues year over year was primarily  attributable  to the
inclusion, in the three months ended March 31, 1999, of revenues attributable to
the ARDIS data service.

<TABLE>
<CAPTION>

                                  Three Months Ended
Summary of  Revenue                    March 31,
(in millions)                     1999         1998       Change       % Change
                                  ----         ----       ------       --------
<S>                               <C>          <C>        <C>               <C> 
Voice Service                     $3.0         $3.2       ($0.2)            (6)%
Data Service                      12.0          2.3         9.7            422
Capacity Resellers and Other       1.2          0.9         0.3             33
Equipment Sales                    4.1          3.6         0.5             14
</TABLE>

The decrease in service  revenue from voice  services was  primarily a result of
reduced  per-minute  rates as a result of the sale of the assets of our maritime
division, in October 1998, to a reseller,  partially offset by a 21% increase in
voice  customers in the first quarter of 1999 as compared to 1998.  The increase
in service  revenue from the Company's data services was due  principally to the
inclusion in the three months ended March 31, 1999 of approximately $9.4 million
from the ARDIS data service. Service revenue from capacity resellers, who handle
both  voice and data  services,  increased  primarily  as a result of  increased
contract commitments from current customers.

Revenue from the sale of subscriber equipment increased as a result of increased
sales of certain data products.

<TABLE>
<CAPTION>

                                  Three Months Ended
Summary of  Expenses                   March 31,
(in millions)                     1999          1998       Change       % Change
                                  ----          ----       ------       --------
<S>                              <C>            <C>         <C>             <C> 
Cost of Service & Operations     $17.9          $7.7        $10.2           132%
Cost of Equipment Sales            4.5           3.9          0.6            15
Sales & Advertising                4.7           3.0          1.7            57
General & Administrative           4.8           3.6          1.2            33
Depreciation & Amortization       13.8          10.2          3.6            35
</TABLE>

                                      -20-

<PAGE>

As of January 1999,  as a result of the  completion  of the  integration  of the
ARDIS  acquisition and the  achievement of certain  related cost synergies,  the
Company ceased to report separate company  information for ARDIS.  Consequently,
ARDIS costs are no longer  distinguished  from those of the remaining  business,
and the first quarter discussion reflects the costs of the consolidated entity.

Cost of service and  operations  for the first quarter of 1999 includes costs to
support  subscribers  and to  operate  the  network.  As a  percentage  of total
revenues,  cost of service and  operations was 88% and 77% for the first quarter
of 1999 and 1998,  respectively.  The increase in cost of service and operations
was primarily attributable to (i) additional headcount, primarily as a result of
the ARDIS  acquisition,  (ii) increased  communication  charges  associated with
increased  service  usage and costs to support  the ARDIS  terrestrial  network,
(iii)  system and base  station  maintenance  to support  the ARDIS  terrestrial
network, (iv) site rental costs associated with the terrestrial network, and (v)
incremental  Year 2000 costs.  As a percentage  of revenue,  cost of service and
operations has increased as a result of the variable  costs incurred  within the
ARDIS terrestrial network, such as site rent and telecommunications costs.

The increase  from the first quarter of 1998 to the first quarter of 1999 in the
cost of equipment sold was primarily  attributable to the increase in the volume
of sales of the various data products.

Sales  and  advertising  expenses  were 23% of total  revenue  during  the first
quarter  of 1999 and 30% of total  revenue in the same  period in 1998.  The 57%
increase in sales and advertising expenses from the first quarter of 1998 to the
first quarter of 1999 was primarily  attributable  to increased  headcount costs
resulting from the ARDIS acquisition.


                                      -21-

<PAGE>


General and administrative  expenses represented 24% and 36% of total revenue in
the first quarter of 1999 and 1998,  respectively.  The $1.1 million increase in
general and  administrative  expenses  quarter over quarter for 1999 compared to
1998 was primarily  attributable  to (i)  headcount  costs related to additional
staffing  as a  result  of the  ARDIS  acquisition,  and  (ii)  occupancy  costs
resulting from the leasing of the two ARDIS office locations.

Depreciation and amortization  expense  represented  approximately  68% of total
revenue in the first  quarter of 1999,  as compared to 101% of total  revenue in
the first  quarter  of 1998.  The $3.6  million  increase  in  depreciation  and
amortization expense was primarily  attributable to the addition of ARDIS assets
and step-up in the basis of ARDIS licenses.

Interest and other income was $1.7 million for first quarter of 1999 as compared
to $0.1 million for same period in 1998.  The increase was primarily a result of
interest earned on certain required  escrows  established with the proceeds from
the Senior Notes.  The Company incurred $15.9 million of interest expense in the
first  quarter of 1999  compared  to $6.6  million  in the same  period of 1998,
reflecting (i) interest  expense on the Senior Notes at 12.25%,  offset by lower
debt  balances  on our bank loans  (comprising  the term loan  facility  and the
revolving credit  facility) and (ii) the amortization of debt discount,  prepaid
interest  and debt  offering  costs in the  amount of $4.6  million in the first
quarter of 1999,  compared to $2.5 million in the first  quarter of 1998.  It is
anticipated  that  interest  costs will continue to be  significant  as a result
Senior  Notes and of the  borrowings  under our term loan and  revolving  credit
facilities. (See  "Liquidity and Capital Resources").

Net  capital  expenditures  for the  first  quarter  of 1999  for  property  and
equipment  were $2.5 million  compared to $1.1 million in 1998. The increase was
largely  attributable  to the  acquisition  of assets  necessary to continue the
build-outs of the ARDIS network.

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 achieve positive cash flow and profitable  operations.  The Company
expects  to  continue  to make  significant  capital  outlays  to fund  interest
expense,  capital  expenditures  and working  capital  prior to the time that it
begins to  generate  positive  cash  flow from  operations.  These  outlays  are
expected to continue for the foreseeable future thereafter.

On March 31, 1998, AMSC  Acquisition  Company,  Inc. ("Acquisition  Company"), a
wholly-owned  subsidiary of American Mobile Satellite  Corporation,  issued $335
million  of units consisting  of 12 1/4%  Senior  Notes  due 2008  (the  "Senior
Notes"),  and one  warrant to  purchase  3.75749  shares of Common  Stock of the
Company for each $1,000  principal  amount of Notes (the  "Warrants"),  and also
restructured  its existing bank  financing (the "New Bank  Financing").  The New
Bank Financing of $200 million  consists 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.  As of April 30, 1999, the Company had $41.0 million
available  for  borrowing  under the Revolving  Credit  Facility.  Additionally,
Motorola  has agreed to provide  the  Company  with up to $10  million of vendor
financing (the "Vendor Financing Commitment"),  which is available to finance up
to 75% of the purchase price of additional  base stations  needed to meet ARDIS'
buildout  requirements under certain customer  contracts.  As of March 31, 1999,
$4.6 million was outstanding under this facility.

                                      -22-
<PAGE>

In  connection  with  the  New  Bank  Financing,   each  of  Hughes  Electronics
Corporation,  Singapore Telecommunications Ltd. and Baron Capital Partners, L.P.
(collectively,  the "Bank Facility  Guarantors") extended separate guarantees of
the obligations of each of the Acquisition Company and the Company to the Banks,
which on a several basis  aggregated to $200 million.  In their  agreement  with
each  of the  Acquisition  Company  and the  Company  (the  "Guarantee  Issuance
Agreement"),  the Bank  Facility  Guarantors  agreed  to make  their  guarantees
available  for the New Bank  Financing.  In exchange  for the  additional  risks
undertaken  by the Bank  Facility  Guarantors  in  connection  with the New Bank
Financing,  the  Company  agreed to  compensate  the Bank  Facility  Guarantors,
principally  in the form of 1 million  additional  warrants and repricing of 5.5
million warrants  previously issued (together,  the "Guarantee  Warrants").  The
Guarantee  Warrants were issued with an exercise price of $12.51 and were valued
at  approximately  $17.7  million.  Additionally,  on March 29,  1999,  the Bank
Facility  Guarantors  agreed to  eliminate  certain  covenants  contained in the
Guarantee Issuance Agreement relating to earnings before interest, depreciation,
amortization  and taxes  ("EBITDA")  and service  revenue.  In exchange for this
elimination  of  covenants,  the  Company  agreed  to  reprice  their  Guarantee
Warrants,  effective  April 1,  1999,  from  $12.51 to  $7.50.  The value of the
repricing was approximately $1.5 million.  As of April 30, 1999, the Company had
outstanding  borrowings of $100 million of the Term Loan  Facility at 5.5%,  and
$59 million under the Revolving Credit Facility at rates ranging from 5.4375% to
5.6875%.

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 New Bank Financing 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 XM Radio and the Acquisition Company.

In connection with the New Bank Financing,  the Company entered into an interest
rate swap  agreement,  with an implied annual rate of 6.51%.  The swap agreement
reduces the impact of interest  rate  increases on the Term Loan  Facility.  The
Company paid a fee of approximately $17.9 million for the swap agreement.  Under
the swap  agreement,  the Company  will receive an amount equal to LIBOR plus 50
basis  points,  paid directly to the banks on a quarterly  basis,  on a notional
amount of $100 million until the termination date of March 31, 2001. The Company

                                      -23-

<PAGE>



has reflected as an asset the unamortized fee paid for the swap agreement in the
accompanying  financial  statements.  The Company is exposed to a credit loss in
the event of non-performance by the counter party under the swap agreement.  The
Company does not believe there is a significant  risk of non  performance as the
counter party to the swap agreement is a major financial institution.

Deferred Trade Payables

The Company has arranged  the  financing of certain  trade  payables,  and as of
March 31, 1999,  $3.0 million of deferred  trade  payables were  outstanding  at
rates ranging from 6.10% to12.0% and are generally payable by the end of 1999.

The Company's  current  operating  assumptions  and  projections,  which reflect
management's  best  estimate  of  subscriber  and revenue  growth and  operating
expenses,  indicate that anticipated  capital  expenditures,  operating  losses,
working capital and debt service  requirements  through 1999, can be met by cash
flows from  operations,  the net proceeds  from the sale of the Senior Notes and
Warrants,  together  with  the  borrowings  under  the  $200  million  New  Bank
Financing,  the Vendor Financing  Commitment and deferred terms on certain trade
payables;  however,  the Company's ability to meet its projections is subject to
numerous  uncertainties and 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 if the Company's cash requirements are more than
projected,  the Company may require additional financing in amounts which may be
material.  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 available on favorable terms.


XM Radio

As  previously  mentioned  (see  "Organization  and  Business"),  XM Radio was a
winning  bidder  for,  and on October  16,  1997,  was awarded an FCC license to
provide  DARS  throughout  the  United  States.  XM Radio has  received,  and is
expected  to  continue  to  receive,  substantially  all of the funding for this
business from  independent  sources in exchange for debt and equity interests in
XM Radio. 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 XM Radio may,
however, even on a fully diluted basis, become a material asset of the Company.

On January 15, 1999,  the Company  issued to Baron Asset Fund  ("Baron") a $21.5
million  note  convertible  into shares of XM Radio  common stock (the "Baron XM
Radio Convertible Note"). The Company  subsequently  loaned  approximately $21.4
million to XM Radio in exchange for XM Radio common stock and a note convertible
into XM Radio  shares  (the "XM  Radio  Note  Receivable").  The  Baron XM Radio
Convertible Note ranks subordinate to all other securities of the Company and is
fully  collateralized  by  approximately  one-half of the shares received by the
Company  as a result of this  transaction.  The XM Radio  Note  Receivable  is a
non-recourse note collateralized by the additional XM Radio shares that would be
received  by the  Company  upon  conversion  of the  note.  The  XM  Radio  Note
Receivable  earns interest at LIBOR plus 5% and is due on the September 30, 2006
maturity date, and the Baron XM Radio  Convertible  Note accrues interest at the
rate of 6% annually,  with all payments  deferred until maturity or extinguished
upon  conversion.  The  Company  has the  option to  satisfy  the Baron XM Radio
Convertible  Note by  tendering  the  shares  into  which  it  would  have  been
convertible in lieu of any cash payments.


                                      -24-

<PAGE>

Commitments

At March 31, 1999, the Company had remaining contractual commitments to purchase
both  mobile data  terminal  inventory  and mobile  telephone  inventory  in the
maximum  amount of $12.0  million  during  1999.  Additionally,  the Company had
remaining contractual  commitments in the amount of $635,000 for the development
of certain  next  generation  data  terminals.  Contingent  upon the  successful
research and  development  efforts,  the Company  would have maximum  additional
contractual commitments for mobile communications data terminal inventory in the
amount of $27.0 million over a three-year  period  starting in 1999. The Company
has the right to terminate the research and development and inventory commitment
by paying cancellation fees of between $1 million and $2.5 million, depending on
when the termination  option is exercised  during the term of the contract.  The
Company also has the right to terminate the inventory  commitment by incurring a
cancellation penalty representing a percentage of the unfulfilled portion of the
contract.  The Company has also  contracted for the purchase of $26.2 million of
next generation wireless data terminals to be delivered beginning mid-1999.  The
contract  contains a 50%  cancellation  penalty.  Additionally,  the Company has
remaining contractual  commitments for the purchase of $392,000 of base stations
required to complete  certain  necessary site  build-outs,  and $1.2 million for
certain software development.

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  March  31,  1999,  all of  these  subsidiaries'  net  assets  were
restricted under these agreements. These restrictions will have an impact on the
Company's ability to pay dividends.

                                      -25-

<PAGE>

Cash used in operating  activities  was $16.0  million for the first  quarter of
1999 compared to $10.9 million for the  comparable  period in 1998. The increase
in  cash  used  in  operating  activities  was  primarily  attributable  to  (i)
approximately $3.0 million of increased operating losses,  primarily as a result
of additional  net expenses  incurred as a result of the ARDIS  acquisition  and
Year  2000  compliance  programs  and  (ii)  increases  in net  working  capital
resulting primarily from increased data service revenues. Cash used in investing
activities  was $25.4 for the first quarter of 1999  compared to $193.4  million
for the first  quarter of 1998,  representing  (i) the  acquisition  of ARDIS in
March 1998, and the funding of certain  escrows  required in connection with the
Acquisition and issuance of Senior Notes, offset by the issuance in January 1999
of the XM Radio Note Receivable. Cash provided by financing activities was $47.2
million in the first quarter of 1999 as compared to $223.5  million in the first
quarter of 1998  reflecting  the issuance of the Notes in March 1998,  offset by
the  repayment of other  long-term  debt in the first  quarter of 1998,  and the
proceeds  from the  issuance  of the Baron XM Radio  Convertible  Note and draws
under the New Bank  Financing in the first  quarter of 1999.  Proceeds  from the
sale of Common  Stock were  $162,000  and $103,000 for the first three months of
1999 and 1998, respectively.  Payments on long-term debt and capital leases were
$1.3  million  and  $100,000  for the  first  three  months  of 1999  and  1998,
respectively.  In addition,  the Company incurred $40,000 of debt issuance costs
in the first  quarter of 1999, as compared to $13.5 million in the first quarter
of 1998,  which  resulted from the placement of the Notes and  amendments to the
New Bank  Financing.  As of March 31, 1999, the Company had $8.1 million of cash
and cash equivalents,  working capital of $21.7 million of securities, and $41.0
million of investments restricted for the payment of interest.

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.

Year 2000 Readiness

American Mobile has developed and is implementing a Year 2000 Readiness  Program
("Year 2000 Readiness Program") to address Year 2000 issues.  "Year 2000 Ready,"
or "Year 2000  Readiness,"  means that  customers  will  experience  no material
difference in performance and functionality of the Company's  networks prior to,
during or after the year 2000.

The  Company's  Year 2000  Readiness  Program uses the phased  approach  that is
standard in its industry.  The Awareness,  Inventory and Assessment  phases have
been  completed,  and American  Mobile is at various  stages of the  Renovation,
Validation/Test and  Implementation/Rollout  phases, depending on the particular
system involved.

The Inventory and Assessment Phases  concentrated on the Company's core business
systems:  those systems, both hardware and software,  whose failure could have a
material  impact on its financial  condition and operations.  Vendors  providing
critical  products  and  services to American  Mobile are also  included in this
definition of core business systems.  Although the core business systems are the
top priority in the  Company's  Year 2000  Readiness  Program,  American  Mobile
assessed all of its software and hardware for Year 2000 Readiness.


                                      -26-

<PAGE>

American    Mobile's   plans   for   the   Renovation,    Validation/Test    and
Implementation/Rollout  Phases  call for it to be Year 2000  Ready by the end of
the third  quarter of 1999. In addition,  the Company is currently  scheduled to
complete  renovations,  implementation  and  rollout  of  its  internal  systems
(including its voice customer  billing  software,  CMIS),  in the fourth quarter
1999;  these internal  software  systems do not affect the Company's  ability to
pass customer traffic and therefore will not affect Year 2000 Readiness.

The complex of hardware  and  software  that the Company  maintains  consists of
commercial  off-the-shelf (COTS) software,  as well as custom software developed
specifically for American Mobile's networks. In certain cases, American Mobile's
Year 2000 Readiness Program involves upgrading COTS software that is unsupported
by the vendor or whose Year 2000 Readiness  could not be  determined.  Upgrading
such COTS software,  as planned,  provides greater certainty  regarding the Year
2000  Readiness  of such  products  and  ensures  that  vendor  support  will be
available.

The  total  cost  of  American   Mobile's  Year  2000   Readiness   Program  was
approximately  $2.4 million in 1998.  Expenditures  for the Year 2000  Readiness
Program in 1999 are estimated to be up to $7.4 million,  of which  approximately
$1.5  million  was  incurred  as of March 31,  1999.  Some  modification  costs,
including  the  purchase of  software  upgrades  and  consulting  services,  are
expensed as incurred while other modification costs, such as hardware purchases,
are being treated as capital expenditures.

The estimated cost and date on which American  Mobile  believes its network will
be Year 2000 Ready are based on management's best estimates.  However,  there is
no  guarantee  that the Company will achieve  these  results and actual  results
could  differ  materially  from those  anticipated.  Some of  American  Mobile's
critical  business systems depend  significantly on software  programs and third
party services that are not within the Company's control.  Failure to solve Year
2000 errors within American  Mobile's  critical business systems could result in


                                      -27-

<PAGE>


possible service outages, miscalculations or disruption of operations that could
have a material impact on the Company's business. Because of the Company's heavy
dependence  on  software,  some  Year  2000  problems  may not be  found  or the
remediation  efforts may introduce new bugs that are not identified  before they
impact operations. This applies to both COTS software and custom software.

If American Mobile's customers fail to become Year 2000 ready on time with their
own hardware and software systems,  their  applications may not function even if
American  Mobile's  systems  are Year 2000  Ready.  This will  result in reduced
traffic and  revenues.  Also,  suppliers  of goods and  services may suffer Year
2000-related  failures  from which the  Company  cannot  adequately  protect its
business.

While  management  believes  that the Company  will be able to achieve Year 2000
Readiness in a timely manner,  the schedule for completing the implementation of
several core business  systems  extends to the third quarter 1999 and there is a
possibility  that  American  Mobile  may not  become  Year 2000 Ready on time or
within budget.  Contingency  planning, as discussed below, is currently underway
to minimize  the risk of  business  interruptions  caused by Year 2000  problems
within the core business systems.

American Mobile has contingency plans in place to minimize service interruptions
that can  mitigate,  although not  eliminate,  interruptions  caused by problems
resulting  from Year 2000  issues.  For  example,  the Company has backup  power
supplies  and  generators  in place for certain  portions of its networks in the
event of electrical  power  outages.  In addition,  for some  services  American
Mobile has contracted with more than one service provider.  These plans, systems
and services are being  incorporated  into the Company's  Year 2000  contingency
planning.  To the extent that it is  commercially  reasonable to do so, American
Mobile will include other  redundant or  alternative  sources of services in its
Year 2000  contingency  planning  efforts.  American Mobile  anticipates  having
additional Year 2000 contingency plans in place by June 1999.

Accounting Standards

In June  1998,  FASB  issued  Statement  No.  133,  "Accounting  for  Derivative
Instruments  and Hedging  Activities,"  which  requires the  recognition  of all
derivatives as either assets or liabilities  measured at fair value. The Company
does not believe that the adoption of this statement will have a material impact
on its financial position and results.

In March 1999, FASB issued an Exposure Draft on an  Interpretation of Accounting
Principles  Board Opinion No. 25 Accounting for Certain  Transactions  involving
Stock Compensation.  This proposed Interpretation would make it more likely that
expense  would be required to be  recognized in the case of, among other things,
stock  (including  stock options) issued to non-employee  members of an entity's
board of  directors.  The  Company  has  assessed  the  impact of this  proposed
Interpretation and does not believe that adoption of this  Interpretation  would
have a material impact on its financial position and results.

                                      -28-

<PAGE>

                           PART II - OTHER INFORMATION

                    Item 6. Exhibits and Reports on Form 8-K

         (a)   Exhibits



10.33a  -      Amendment  No.  1,  dated  as of May 10,  1999,  to  Amended  and
               Restated  Registration  Rights  Agreement  among American  Mobile
               Satellite   Corporation  and  Hughes   Electronics   Corporation,
               Singapore  Telecommunications  Ltd., and Baron Capital  Partners,
               L.P. (filed herewith)

11.1     -     Computations of Earnings Per Common Share (filed herewith)

27.0     --    Financial Data Schedule (filed herewith)





                                      -29-

<PAGE>





                                    SIGNATURES



Pursuant  to the  requirements  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

                                    (Registrant)





Date:   May 13, 1999                By: /s/Walter V. Purnell, Jr.
                                    ------------------------------------
                                    Walter V. Purnell, Jr.
                                    President and Chief Executive Officer







                                    /s/W. Bartlett Snell
                                    -------------------------------------
                                    W. Bartlett Snell
                                    Senior Vice President and 
                                    Chief Financial Officer
                                    (principal financial and accounting officer)





                                      -30-

<PAGE>







                                  EXHIBIT INDEX



Number         Description



10.33a  -      Amendment  No.  1,  dated  as of May 10,  1999,  to  Amended  and
               Restated  Registration  Rights  Agreement  among American  Mobile
               Satellite   Corporation  and  Hughes   Electronics   Corporation,
               Singapore  Telecommunications  Ltd., and Baron Capital  Partners,
               L.P. (filed herewith)

11.1     -     Computations of Earnings Per Common Share (filed herewith)

27.0     -     Financial Data Schedule (filed herewith)




<PAGE>


                                                                  EXHIBIT 10.33a



                               AMENDMENT NO. 1 TO
                              AMENDED AND RESTATED
                          REGISTRATION RIGHTS AGREEMENT



     AMENDMENT NO. 1, dated as of May 10, 1999 (this "Amendment"),  by and among
American Mobile Satellite  Corporation,  a Delaware corporation (the "Company"),
Hughes Electronics  Corporation  ("Hughes"),  Singapore  Telecommunications Ltd.
("Singapore   Telecom"),   and  Baron  Capital  Partners,   L.P.  ("Baron,"  and
collectively  with  Hughes and  Singapore  Telecom,  the  "Guarantors"),  to the
Amended and Restated  Registration  Rights  Agreement dated as of March 31, 1998
(said Agreement, as the same may be amended,  supplemented or otherwise modified
from time to time,  being the  "Registration  Rights  Agreement,"  and the terms
defined  therein being used herein as therein defined unless  otherwise  defined
herein), by and among the Company and the Guarantors.



                                   WITNESSETH:



     WHEREAS,  the Guarantors have certain piggyback  registration  rights under
the Registration Rights Agreement; and



     WHEREAS,  the Company filed a  registration  statement on Form S-3 with the
Securities and Exchange Commission (the "SEC") on January 29, 1999 in connection
with an  offering  of its common  stock  (the  "Offering"),  which  registration
statement was declared effective by the SEC on March 31, 1999; and



     WHEREAS,  Hughes  declined  to  exercise  its  piggyback  rights  under the
Registration Rights Agreement with respect to the Offering.



     NOW,  THEREFORE,  in  consideration  of the mutual covenants and agreements
contained herein, the parties hereto hereby agree as follows:

     Section 1.  Consideration  for  Amendment.  The  Company has agreed to this
Amendment in consideration  for Hughes's  election not to exercise its piggyback
rights under the Registration Rights Agreement with respect to the Offering.



<PAGE>

     Section 2. Extension of Period for Demand  Registration  in Section 2.1(a).
Section 2.1(a) of the  Registration  Rights  Agreement is hereby amended so that
each and every reference therein to "March 31, 2005" is replaced with "March 31,
2007."

     Section 3. Additional Demand Registration for Hughes.  Subject to the terms
and  conditions  contained  herein,  Hughes  may, at any time prior to March 31,
2007,  make a written  request of the  Company  for a Demand  Registration  with
respect to its Registrable Securities (the "Hughes Demand Registration"),  which
request  shall be in addition to the two Demand  Registrations  provided  for in
Section 2.1 of the  Registration  Rights  Agreement (the "Guarantor Group Demand
Registrations").  The Hughes Demand  Registration may not be exercised by Hughes
(or its permitted assignee) until the earlier of (i) both of the Guarantor Group
Demand  Registrations having been exercised and completed in accordance with the
terms of Section  2.1, and (ii) such time as when  Guarantors  other than Hughes
(or such Guarantors' assignees) do not own any Registrable Securities.  In order
to exercise the Hughes Demand  Registration,  Hughes shall follow the procedures
set forth in Section 2.1, and  Hughes's  election to exercise the Hughes  Demand
Registration  shall be subject to all of the terms and  conditions  contained in
Section 2.1; provided,  that, in the case of a Hughes Demand  Registration,  the
first paragraph of Section 2.1(a) shall not be applicable, and all references in
Section 2.1 to the "Demanding Group" shall be deemed, where applicable, to refer
solely to "Hughes." If the Hughes Demand  Registration is exercised by Hughes in
accordance  with the terms  hereof,  the  Guarantors  other than  Hughes will be
entitled  to  exercise   piggyback   rights  pursuant  to  Section  2.2  of  the
Registration Rights Agreement,  with respect to any Registrable Securities owned
by such Guarantors at that time. In the case of a Hughes Demand  Registration in
which the Guarantors other than Hughes wish to exercise their piggyback  rights,
Registrable Securities owned by such other Guarantors and desired to be included
in such Hughes Demand  Registration  shall be accorded the priority set forth in
Section  2.1(c)(x)(iv),  in  the  case  of  registrations  occurring  up to  and
including the Subordination  Termination Date, or Section 2.1(c)(y)(ii),  in the
case of registrations  occurring after the  Subordination  Termination Date. For
the  avoidance  of  doubt,  in the case of a  Hughes  Demand  Registration,  the
Guarantors  other than Hughes  shall not be deemed to be part of the  "Demanding
Group" for the purpose of  determining  priority of  registration  in accordance
with Section 2.1(c), or for any other purpose.

     Section 4. Assignment of Rights Under  Registration  Rights Agreement.  The
Company and each of the Guarantors  hereby agrees that the  Registration  Rights
Agreement (as amended hereby) and the rights of any Guarantor  thereunder may be
transferred and assigned to any entity that acquires any Registrable  Securities
from time to time;  provided,  that no such assignment shall be effective unless
(i) the assigning  Guarantor (or its permitted assignee) notifies the Company in
writing of such assignment,  and (ii) the prospective assignee agrees in writing
to be bound by, and become a party to, the Registration Rights Agreement.

     Section 5. Miscellaneous.

     (a)Upon  the  effectiveness  of  this  Amendment,  each  reference  in  the
Registration  Rights Agreement to "this  Agreement,"  "hereunder,"  "herein," or
words of like import  shall mean and be a reference to the  Registration  Rights
Agreement as amended hereby.

     (b)Except as specifically amended hereby, the Registration Rights Agreement
shall remain in full force and effect and is hereby ratified and confirmed.

     (c)The  execution and delivery and  effectiveness  of this Amendment  shall
not,  except as  expressly  provided  herein,  operate as a waiver of any right,
power,  or  remedy  which  the  Company  or any  Guarantor  may have  under  the
Registration Rights Agreement.

     (d)This  Amendment  may be  executed in any number of  counterparts  and by
different  parties  hereto  in  separate  counterparts,  each of  which  when so
executed and delivered  shall be deemed to be an original and all of which taken
together shall constitute but one and the same instrument.

     (e)The Company acknowledges its obligation, under Section 4 of the Guaranty
Issuance  Agreement,  to pay, upon demand, to each Guarantor,  the amount of any



<PAGE>


and all reasonable expenses,  including, without limitation, the reasonable fees
and expenses of such  Guarantor's  counsel and of any experts and agents,  which
such  Guarantor  has incurred or may incur in connection  with the  negotiation,
preparation or administration of this Amendment.

     (f)This Amendment shall be governed by and construed in accordance with the
laws of the state of New York.


<PAGE>



     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Amendment to be
duly  executed  and  delivered  by  their  respective  officers  thereunto  duly
authorized as of the date first written above.



AMERICAN MOBILE SATELLITE CORPORATION


By:  /s/ Randy S. Segal
     ------------------
     Name:   Randy S. Segal
     Title:  Senior Vice President and General Counsel




HUGHES ELECTRONICS CORPORATION


By:  /s/ Mark McEachen
     -----------------
     Name:   Mark McEachen
     Title:  Senior Vice President



SINGAPORE TELECOMMUNICATIONS LTD.


By:  /s/ Hoh Wing Chee 
     ----------------- 
     Name:   Hoh Wing Chee
     Title:  VP (International Network)







<PAGE>



BARON CAPITAL PARTNERS, L.P.


By:  Baron Capital Management Inc.,
       A General Partner


By:  /s/ Linda S. Martinson
     ----------------------
     Name:   Linda S. Martinson
     Title:  Vice President and General Counsel


<PAGE>


                                                                    EXHIBIT 11.1

                      AMERICAN MOBILE SATELLITE CORPORATION
                     ---------------------------------------
                    COMPUTATIONS OF EARNINGS PER COMMON SHARE
                     ---------------------------------------
                    (in thousands, except per share amounts)
                     ---------------------------------------



<TABLE>
<CAPTION>
                                                               Three Months Ended March 31,
                                                                  1999                1998
                                                                  ----                ----
BASIC EARNINGS PER SHARE CALCULATION

<S>                                                          <C>                 <C>      
Net Loss                                                     ($39,649)           ($25,242)
                                                             =========           =========

Net Loss per common share                                      ($1.23)             ($1.00)
                                                               =======             =======

Weighted-average common shares outstanding                     32,225               25,241
                                                               =======              ======

DILUTED EARNINGS PER SHARE CALCULATION

Net Loss                                                     ($39,649)           ($25,242)
                                                             =========           =========

Net Loss per common share                                      ($1.23)             ($1.00)
                                                               =======             =======

Weighted-average common shares (1)                              32,309              25,336
                                                                ======              ======

(1)  Calculated as follows:
      Historical weighted average number of
          shares outstanding                                    32,225              25,241
      Assumed exercise of stock options                             --                  33
      Assumed exercise of stock purchase                            84                  62
                                                              --------            --------
warrants
                                                                32,309              25,336
                                                                ======              ======

</TABLE>




<PAGE>

<TABLE> <S> <C>


<ARTICLE>                               5
<LEGEND>
     This schedule  contains summary  financial  information  extracted from the
Company's unaudited Consolidated Statement of Loss,  Consolidated Balance Sheet,
and  Consolidated  Statement  of Cash Flows,  in each case for the three  months
ended March 31,  1999,  and is  qualified  in its  entirety by reference to such
financial statements.
</LEGEND>
<MULTIPLIER>                                1,000
<CURRENCY>                                  U.S. Dollars
       
<S>                                         <C>
<PERIOD-TYPE>                               3-MOS
<FISCAL-YEAR-END>                           DEC-31-1999
<PERIOD-START>                              JAN-01-1999
<PERIOD-END>                                MAR-31-1999
<EXCHANGE-RATE>                             1
<CASH>                                      8,131
<SECURITIES>                                131,348
<RECEIVABLES>                               16,752
<ALLOWANCES>                                0
<INVENTORY>                                 17,440
<CURRENT-ASSETS>                            122,035
<PP&E>                                      239,017
<DEPRECIATION>                              0
<TOTAL-ASSETS>                              508,598
<CURRENT-LIABILITIES>                       50,598
<BONDS>                                     526,227
                       0
                                 0
<COMMON>                                    324
<OTHER-SE>                                  (62,182)
<TOTAL-LIABILITY-AND-EQUITY>                508,598
<SALES>                                     4,066
<TOTAL-REVENUES>                            20,230
<CGS>                                       4,528
<TOTAL-COSTS>                               27,388
<OTHER-EXPENSES>                            13,772
<LOSS-PROVISION>                            0
<INTEREST-EXPENSE>                          15,930
<INCOME-PRETAX>                             (39,649)
<INCOME-TAX>                                0
<INCOME-CONTINUING>                         (39,649)
<DISCONTINUED>                              0
<EXTRAORDINARY>                             0
<CHANGES>                                   0
<NET-INCOME>                                (39,649)
<EPS-PRIMARY>                               (1.23)
<EPS-DILUTED>                               0
        


</TABLE>


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