AMERICAN MOBILE SATELLITE CORP
10-Q, 1998-08-14
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 June 30, 1998
                         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 July 31, 1998: 32,129,163


<PAGE>



                          PART I--FINANCIAL INFORMATION

                          Item 1. Financial Statements

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



<TABLE>
<CAPTION>
                                                         Three Months Ended                 Six Months Ended
                                                               June 30,                          June 30,
                                                       1998             1997              1998             1997
                                                    ----------        ---------         ---------       ---------
<S>                                                 <C>               <C>               <C>             <C>
REVENUES
   Services                                           $16,670           $4,979           $23,088          $9,132
   Sales of equipment                                   5,740            5,774             9,344          10,306
                                                    ----------        ---------         ---------       ---------
   Total Revenue                                       22,410           10,753            32,432          19,438

COSTS AND EXPENSES
   Cost of service and operations                      16,918            8,201            24,646          17,074
   Cost of equipment sold                               5,415            7,140             9,296          12,582
   Sales and advertising                                4,711            3,059             7,733           6,280
   General and administrative                           5,773            2,937             9,404           7,805
   Depreciation and amortization                       14,457           11,083            24,620          21,020
                                                       ------           ------            ------          ------
   Operating Loss                                     (24,864)         (21,667)          (43,267)        (45,323)

INTEREST EXPENSE                                      (15,706)          (5,281)          (22,344)         (9,651)
INTEREST AND OTHER INCOME                               1,607              106             1,748           1,051
EQUITY IN LOSS OF AMRC                                     --               --              (342)             --
                                                       ------           ------            ------          ------

NET LOSS                                             ($38,963)        ($26,842)         ($64,205)       ($53,923)
                                                    ==========        =========         =========       =========

BASIC AND DILUTED NET LOSS PER SHARE OF
COMMON STOCK                                           ($1.23)          ($1.07)           ($2.25)         ($2.15)
                                                    ==========        =========         =========       =========

WEIGHTED AVERAGE COMMON SHARES
OUTSTANDING DURING THE PERIOD (000'S)                  31,719           25,120            28,502          25,115
                                                    ==========        =========         =========       =========


See notes to consolidated financial statements.
</TABLE>




<PAGE>



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


                                                            June 30,           December 31,
                                                              1998                1997
                                                              ----                ----
ASSETS
CURRENT ASSETS:
<S>                                                        <C>                  <C>   
   Cash and cash equivalents                                 $8,944               $2,106
   Inventory                                                 37,887               40,321
   Accounts receivable-trade, net                            13,279                8,140
   Restricted cash-current portion                           41,038                   --
   Prepaid in-orbit insurance                                 1,993                4,564
   Other current assets                                      20,602                9,608
                                                             ------                -----
   Total current assets                                     123,743               64,739

PROPERTY AND EQUIPMENT - NET                                265,788              233,174
GOODWILL AND INTANGIBLES - NET                               54,347                   --
DEFERRED CHARGES AND OTHER ASSETS                            34,554               13,534
RESTRICTED CASH - NON-CURRENT                                83,970                   --
                                                             ------             --------
   Total assets                                            $562,402             $311,447
                                                           ========             ========

LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES:
   Accounts payable and accrued expenses                    $40,725              $35,861
   Obligations under capital leases due within one year       3,687                  798
   Current portion of long-term debt                          3,006               15,254
   Other current liabilities                                  7,673                7,520
                                                              -----                -----
   Total current liabilities                                 55,091               59,433
LONG-TERM LIABILITIES:
   Obligations under Bank Financing                         122,000              198,000
   Obligations under Senior Notes, net of discount          326,722                   --
   Capital lease obligations                                 10,163                3,147
   Net assets acquired in excess of purchase price            2,376                2,725
   Other long-term debt                                       1,003                1,364
   Other long-term liabilities                                  563                  647
                                                            -------              -------
   Total long-term liabilities                              462,827              205,883
                                                            -------              -------
   Total liabilities                                        517,918              265,316
                                                            -------              -------
STOCKHOLDERS' EQUITY
   Preferred Stock, par value $0.01;  no shares issued           --                   --
   Common Stock, voting, par value $0.01                        318                  252
   Additional paid-in capital                               502,228              451,892
   Common Stock purchase warrants                            62,547               36,338
   Unamortized guarantee warrants                           (37,640)             (23,586)
   Retained loss                                           (482,969)            (418,765)
                                                           ---------            ---------
   Total stockholders' equity                                44,484               46,131
                                                             ------            ---------
   Total liabilities and stockholders' equity              $562,402             $311,447
                                                           ========             ========

</TABLE>
See notes to consolidated financial statements.




<PAGE>



                          PART I-FINANCIAL INFORMATION

                    Item 1. Financial Statements (continued)

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


                                                                          Six Months Ended
                                                                               June 30
                                                                      ------------------------

                                                                           1998        1997

CASH FLOWS FROM OPERATING ACTIVITIES:
<S>                                                                     <C>          <C>        
Net loss                                                                ($64,205)    ($53,923)  
Adjustments to reconcile net loss to net cash used
in operating activities:
  Amortization of guarantee warrants, debt discount and issuance costs     5,877        4,297
  Depreciation and amortization                                           24,220       21,020
  Equity in loss from AMRC                                                   341           --
  Amortization of interest rate swap                                       1,491           --
  Changes in assets and liabilities:
     Inventory                                                             1,889       (7,426)
     Prepaid in-orbit insurance                                            2,571        3,387
     Trade accounts receivable                                             1,941       (2,142)
     Other current assets                                                     67        5,565
     Accounts payable and accrued expenses                                 1,245       (8,558)
     Deferred trade payables                                              (7,680)          --
     Deferred items - net                                                   (124)         285
                                                                        ---------    ---------
Net cash used in operating activities                                    (32,367)     (37,495)

CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property and equipment                                       (5,558)      (5,804)
Acquisition of ARDIS                                                     (51,440)          --
Purchase of long-term, restricted cash securities                       (141,899)          --
Investment in AMRC                                                            --       (1,500)
                                                                       ----------    ---------
Net cash used in investing activities                                   (198,897)      (7,304)

CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of Common Stock                                       236          141
Principal payments under capital leases                                   (1,234)      (1,882)
Proceeds from Bank Financing                                              24,000           --
Repayment of Bank Financing                                             (100,000)          --
Proceeds from bridge financing                                            10,000           --
Repayment of bridge financing                                            (10,000)          --
Proceeds from Senior Notes and Warrants                                  335,000           --
Payments on long-term debt                                                (4,933)      (5,225)
Proceeds from long-term debt                                                  --       53,000
Debt issuance costs                                                      (14,967)        (611)
                                                                         --------      -------
Net cash provided by financing activities                                238,102       45,423

Net increase (decrease) in cash and cash equivalents                       6,838          624

CASH AND CASH EQUIVALENTS, beginning of period                             2,106        2,182
                                                                          ------       ------  


CASH AND CASH EQUIVALENTS, end of period                                  $8,944       $2,806
                                                                          ======       ======


See notes to consolidated financial statements.

</TABLE>


<PAGE>




                          PART I-FINANCIAL INFORMATION

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

                                  June 30, 1998
                                   (Unaudited)


1. Organization and Business
   -------------------------

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

On  March  31,  1998  the  Company  (through  its   newly-formed,   wholly-owned
subsidiary,  AMSC Acquisition Company,  Inc.  ("Acquisition  Company")) acquired
ARDIS Company  ("ARDIS"),  a wholly-owned  subsidiary of Motorola Inc. that owns
and operates a two-way  wireless  data  communications  network,  for a purchase
price of  approximately  $50  million in cash and $50  million in the  Company's
Common Stock and  warrants  (the  "Purchase  Price").  The Company,  through the
acquisition of ARDIS,  becomes a nationwide provider of wireless  communications
services,  including data, dispatch,  and voice services,  primarily to business
customers in the United States.

On October 16, 1997,  American Mobile Radio Corporation,  an indirect subsidiary
of American  Mobile through its subsidiary  AMRC Holdings,  Inc.  (together with
American Mobile Radio Corporation,  "AMRC"), was awarded a license by the FCC to
provide  satellite-based  Digital Audio Radio Service  ("DARS")  throughout  the
United States, following its successful $89.9 million bid at auction on April 2,
1997.  AMRC has and will  continue to receive  funding for this business from an
independent  source  in  exchange  for  debt  and an  equity  interest  in AMRC.
Accordingly,  it is not expected that the development of this business will have
a material impact on the Company's financial position, results of operations, or
cash flows.

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




<PAGE>




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
1997 Annual Report on Form 10-K

The  consolidated  balance  sheet  as of June  30,  1998,  and the  consolidated
statements of loss and cash flows for the three months and six months ended June
30,  1998 and 1997,  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,  result of
operations and cash flows at June 30, 1998,  and for all periods  presented have
been  made.  The  balance  sheet at  December  31,  1997 has been taken from the
audited financial statements.


Acquisition
- -----------

The Company acquired ARDIS for a purchase price of approximately  $50 million in
cash and $50  million in the  Company's  Common  Stock (the  "Purchase  Price").
Approximately  1.5  million  of  the  shares  that  were  issuable  to  Motorola
(representing  approximately  $11.5 million) were  contingent  upon  stockholder
approval at the May 20, 1998 annual meeting of  shareholders.  Such approval was
duly received and the remaining shares issued. The purchase method of accounting
for business  combinations  was used for the recording of the  acquisition.  The
operating results of ARDIS have only been included in the Company's consolidated
statements  of loss  from the date of  acquisition.  The  Company's  preliminary
estimate of the excess of the  purchase  price over the fair market value of net
assets  acquired  is  $54.3  million.  The  Company  has  not  yet  specifically
identified amounts to assign to certain intangibles and licenses; changes in the
amounts  allocated  to such  assets  could  result in  changes  to the amount of
goodwill recorded.  A preliminary  amortization  period of twenty years has been
selected, which is expected in all material respects to be representative of the
amortization  expense  that will  result  from the  ultimate  allocation  to the
specific intangible assets.

The  unaudited pro forma  results give effect to (i) the  Acquisition,  (ii) the
Offering  and  (iii) the New Bank  Financing  as if such  transactions  had been
consummated on January 1 of each of the periods presented.

<TABLE>
<CAPTION>

                                                      Six Months Ended
                                                           June 30,
(dollars in thousands, except per share data)        1998           1997
                                                     ----           ----

<S>                                               <C>            <C>
Revenues                                           $42,364        $41,239
Net loss                                          ($77,812)      ($81,770)
Loss per share                                      ($2.45)        ($2.58)
Weighted-average shares outstanding                 31,708         31,636

</TABLE>

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.

Recently Adopted Accounting Pronouncements
- ------------------------------------------

In June 1997, the Financial Accounting Standards Board ("FASB") issued Statement
of Financial  Accounting  Standards ("SFAS") No. 130,  "Reporting  Comprehensive
Income," and SFAS No. 131,  "Disclosures  about  Segments of an  Enterprise  and
Related Information." The Company adopted both of these standards during the six
month period ended June 30, 1998.


<PAGE>


SFAS No.  130  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 "total comprehensive income" for the
three months and six months ended June 30, 1997 and 1998.

SFAS  No.  131  requires  an  entity  to  disclose   financial  and  descriptive
information  about  its  reportable  operating  segments.  It  also  establishes
standards for related disclosures about products and services, geographic areas,
and  major  customers.  SFAS  No.  131 is not  required  for  interim  financial
reporting  purposes  during 1998. The Company is in the process of assessing the
additional disclosures, if any, required by SFAS No. 131. However, such adoption
will not impact the Company's results of operations or financial position, since
it relates only to disclosures.

Other
- -----

The Company paid  approximately  $9.4 million and $1.6 million in the  six-month
periods  ended June 30,  1998 and 1997,  respectively,  to related  parties  for
capital  assets,  service-related  obligations,  and  payments  under  financing
agreements.  Payments  from  related  parties  for  communication  services  and
equipment  purchases totaled $2.5 million in the six-month period ended June 30,
1998 and $1.2  million  in  the  six-month  period  ended June 30,  1997.  Total
indebtedness to related parties as of June 30, 1998 approximated $1.3 million.

3.  Liquidity and Financing
    -----------------------

$335 Million Unit Offering
- --------------------------

In connection with the acquisition of ARDIS, discussed above, the Company issued
$335 million of Units (the "Units")  consisting of 12 1/4% Senior Notes due 2008
(the "Notes"),  and Warrants to purchase  shares of Common Stock of the Company.
Each Unit  consists  of $1,000  principal  amount  of Notes and one  Warrant  to
purchase  3.75749  shares of Common  Stock at an  exercise  price of $12.51  per
share.  A value of $8.5 million was assigned to the Warrants and is reflected in
the balance sheet as a debt discount.  A portion of the net proceeds of the sale
of the Units were used to finance the Acquisition. In connection with the Notes,
the Company has purchased  approximately  $112.3  million of pledged  securities
that are intended to provide for the payment of the first six interest  payments
on the Notes. The Company incurred approximately $15 million in costs associated
with the placement of the Notes and the Acquisition.

Interest payments are due semi-annually, in arrears, beginning October 1, 1998.

Acquisition  Company  consummated  its  offer  to  exchange  up to $335  million
aggregate  principal  amount of its  registered 12 1/4 percent Senior Notes (due
2008,  Series B) (the "New Notes") for  outstanding  unregistered 12 1/4 percent
Senior Notes (due 2008,  Series A) (the "Old  Notes").  The exchange  expired at
5:00 p.m. (New York City time) on Friday,  August 7, 1998.  Holders tendered for
exchange $334.75 million  aggregate  principal amount of the Old Notes as of the
expiration of the offer. The Old Notes tendered for exchange  constituted 99.93%
of the Old Notes outstanding.

The Notes  contain  covenants  that,  among other  things,  limit the ability of
Acquisition Company, Inc. 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.


New Bank Financing
- ------------------

In connection with the Acquisition, the Company, the Acquisition Company and its
subsidiaries  restructured  the existing $200 million Bank  Financing (the "Bank
Financing") to provide for two facilities:  (i) the Revolving Credit Facility, a
$100 million unsecured  five-year reducing  revolving credit facility,  and (ii)
the Term Loan Facility, a $100 million five-year,  term loan facility with up to
three  additional  one-year  extensions  subject to the lenders'  approval.  The
Revolving Credit Facility bears an interest rate, generally,  of 50 basis points
above  LIBOR and is  unsecured,  with a  negative  pledge  on the  assets of the
Acquisition Company and its subsidiaries  ranking pari passu with the Notes. The
Revolving  Credit  Facility will be reduced $10 million each quarter,  beginning
with the quarter ending June 30, 2002, with the balance due on maturity of March
31, 2003.  Borrowings under the Revolving Credit Facility are subject to certain
conditions  beginning in the fourth quarter of 1998. In the event the Company is
unable to borrow amounts under the Revolving Credit Facility, the Company's cash
needs will  significantly  exceed its  available  resources,  which would have a
material adverse effect on the Company. The revolving Credit Facility ranks pari
passu with the  Notes.  The Term Loan  Facility  is secured by the assets of the
Company,  principally its stockholdings in AMRC and the Acquisition Company, and


<PAGE>



will be effectively subordinated to the Revolving Credit Facility and the Notes.
The New Bank Financing is severally guaranteed by Hughes Electronics Corporation
("Hughes"),  Singapore  Telecommunications  Ltd. ("Singapore Telecom") and Baron
Capital  Partners,  L.P. (the "Bank Facility  Guarantors").  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
re-pricing of 5.5 million warrants  previously issued (together,  the "Guarantee
Warrants").  The Guarantee  Warrants  have an exercise  price of $12.51 and have
been valued at approximately $17.7 million. As of July 31, 1998, the Company had
outstanding borrowings of $100 million of the Term Loan Facility at 6.1875%, and
$27 million under the Revolving Credit Facility at 6.1875%.

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 on a quarterly  basis,  on a notional amount of $100 million
until the  termination  date of March 31, 2001.  The Company 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.


Motorola Vendor Financing
- -------------------------

Motorola has entered into an agreement with a subsidiary of Acquisition Company,
the ARDIS Company, to provide up to $10 million of vendor financing (the "Vendor
Financing  Commitment"),  which  will be  available  to finance up to 75% of the
purchase price of additional  network base  stations.  Loans under this facility
will bear  interest at a rate equal to LIBOR plus 7.0% and will be guaranteed by
the Company and each  subsidiary of the  Acquisition  Company.  The terms of the
facility  require that amounts  borrowed be secured by the  equipment  purchased
therewith. No amounts were outstanding under this facility as of July 31, 1998.

Financing Summary
- -----------------

The Company  believes the proceeds  from the issuance of the Notes,  net of cash
used for the  Acquisition,  together  with  the  borrowings  under  the New Bank
Financing  and the  Vendor  Financing  Commitment,  will be  sufficient  to fund
operating losses, capital expenditures, working capital, and scheduled principal
and interest payments on debt through 1998 and beyond;  however, there can be no
assurance  that the Company's  current  projections  regarding the timing of its
ability to achieve positive  operating cash flow will be accurate,  and that the
Company will not need additional financing in the future.

AMRC
- ----

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

Summarized unaudited financial information for AMRC as of June 30, 1998, and for
the six month  periods  ended June 30,  1998 and 1997,  and for the period  from
December 15, 1992 (date of inception) through June 30, 1998 is set forth below.



<PAGE>



<TABLE>
<CAPTION>


                                                                                December 15, 1992
                                                      Six Months                     through
dollars in thousands                                Ended June 30,                   June 30,
                                                    --------------                   --------
                                                     (unaudited)                   (unaudited)

                                                 1998            1997                  1998
                                                 ----            ----                  ----
<S>                                            <C>             <C>                   <C>   
Gross sales                                    $   --          $   --                $   --
Operating expenses                              8,132              51                 9,242
Loss from operations                            8,132              51                 9,242
Interest expense                                 ----             219                   549
Net loss                                        8,132             270                 9,791
</TABLE>


<TABLE>
<CAPTION>

                                                                                      As of
                                                            As of June 30,         December 31,
                                                                 1998                  1997
                                                                 ----                  ----
                                                              (unaudited)           (unaudited)

<S>                                                          <C>                    <C>    
Current assets                                               $    598               $    --
Noncurrent assets                                             114,929                91,933
Current liabilities                                           108,584                82,949
Noncurrent liabilities                                          6,091                    --
Total stockholders' equity                                        852                 8,983

</TABLE>


Deferred Trade Payables
- -----------------------

In the last quarter of 1997 and the first quarter of 1998, the Company  arranged
the financing of certain trade  payables,  and as of June 30, 1998, $4.0 million
of deferred trade  payables were  outstanding at rates ranging from 6.23% to 12%
and are generally payable by the end of 1998.

Purchase and Lease Agreement
- ----------------------------

As  previously  disclosed,  the Company has entered into certain  agreements  to
acquire a one-half ownership interest in TMI Communications and Company, Limited
Partnership's ("TMI") satellite, MSAT-1, at a cost of $60 million payable over a
five-year  period,  as well as entered into a five-year  lease of the  Company's
satellite,  MSAT-2,  with  African  Continental   Telecommunications  Ltd.  that
provides for aggregate lease payments to the Company of $182.5 million.  Closing
under  the  agreements  is  subject  to a number  of  conditions,  including:  a
successful financing by ACTEL of at least $120 million and completion of certain
satellite testing, inversion and relocation activities with respect to AMSC-1.
 It is anticipated that the closing under both the purchase and lease agreements
will occur simultaneously in the third quarter of 1998.

Other
- -----

On July 2, 1998,  American  Mobile filed an application  for authority to launch
and operate its  second-generation  mobile satellite  system.  This satellite is
intended to support the Company's existing satellite services and also allow the
provision of an expanded  array of services,  such as higher data rate  services
and services to  lower-power  terminals.  There can be no assurance that the FCC
will grant this  application.  If the Company  proceeds with  deployment of this
second-generation  satellite  system,  the  Company  would be  required to raise
substantial additional capital to finance this project.




<PAGE>



4. Legal and Regulatory Matters
   ----------------------------

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

The  ownership  and  operation  of  American  Mobile's  MSS  system  and  ARDIS'
ground-based  two-way  wireless  data  system  are  subject  to  the  rules  and
regulations of the FCC, which acts under authority granted by the Communications
Act and related federal laws. Among other things,  the FCC allocates portions of
the radio  frequency  spectrum to certain  services  and grants  licenses to and
regulates  individual  entities  using the spectrum.  American  Mobile and ARDIS
operate 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 the Network and  certain  types of  subscriber
equipment.  Certain of its  applications  pertaining to future service have been
opposed.  While the Company, for various reasons,  believes that it will receive
the necessary  approvals on a timely basis,  there can be no assurance  that the
requests  will be granted,  will be granted on a timely basis or will be granted
on  conditions  favorable  to  the  Company.  Any  significant  changes  to  the
applications resulting from the FCC's review process or any significant delay in
their approval could adversely affect the Company's financial position,  results
of operations and cash flows.

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 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 to use TMI's space segment to conduct market tests
in the U.S. for the next six months using up to 500 mobile  terminals.  American
Mobile  has  asked the full  Commission  to review  this  decision  and stay the
effectiveness of the temporary authorization. There can be no assurance that the
FCC will stay the  effectiveness  of this decision or rescind the  International
Bureau's grant of Special Temporary Authority.

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 to 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.



<PAGE>



On July 2, 1998,  American  Mobile filed an application  for authority to launch
and operate its  second-generation  mobile satellite  system.  This satellite is
intended to support the Company's  existing  satellite services and, also, allow
the  provision  of an  extended  array of  services,  such as  higher  data rate
services and services to lower-power  terminals.  There is no guarantee that the
FCC will grant this  application.  The filing of the application does not commit
the Company to expend any  resources  toward this project;  however,  should the
Company decide to proceed with the construction of the follow-on satellite,  the
Company would be required to raise substantial  additional  capital to fund this
project.

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

On June 5, 1996,  the FCC  waived  its  one-year  construction  requirement  and
granted ARDIS  extensions  of time to complete  buildouts of  approximately  190
sites,  as  required to  maintain  previously  granted  licenses.  The  extended
construction  deadlines  vary by site until  March 31,  1999.  While  management
believes  that all buildouts  will continue to be completed in a timely  manner,
there can be no  assurances  that  future  delays  will not  occur.  Failure  to
complete the buildouts in a timely manner could result in a loss of licenses for
such sites from the FCC.

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


5.  Other Matters
    -------------

At June 30, 1998, the Company had remaining contractual  commitments to purchase
both  mobile data  terminal  inventory  and mobile  telephone  inventory  in the
maximum amount of $3.6 million over the next year. Additionally, the Company had
remaining  contractual  commitments  in the  amount  of  $1.7  million  for  the
development of certain next generation data terminal inventory.  Contingent upon
the  successful  research  and  development  efforts,  the  Company  would  have
additional  contractual  commitments  for mobile  communications  data  terminal
inventory in the amount of $31.2 million over a three-year  period.  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.

6.  AMSC Acquisition Company Financial Statements
    ---------------------------------------------

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


<PAGE>



Separate company financial  statements for AMSC Acquisition  Company,  Inc. have
not been  prepared,  as  management  believes  the  differences  between the two
statements  to be  immaterial,  and therefore  not material  information  to the
investors.

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 June 30, 1998,  as  discussed  in Note 3, and (ii) certain  immaterial
intercompany  management  fees and expenses  between the Parent and  Acquisition
Company are not eliminated at the Acquisition Company level.

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




<PAGE>



                         AMSC Acquisition Company, Inc.
                    Consolidated Condensed Statements of Loss
                             (dollars in thousands)
                                   (Unaudited)

<TABLE>
<CAPTION>

                                                          Three Months Ended               Six Months Ended
                                                                June 30,                        June 30,

                                                           1998           1997             1998              1997
                                                          ------         -------          -------        --------


REVENUES

<S>                                                       <C>          <C>                <C>              <C>   
       Services                                           $16,670        $4,979            $23,088           $9,132
       Sales of equipment                                   5,740         5,774              9,344           10,306
                                                           ------        ------             ------           ------

       Total Revenues                                      22,410        10,753             32,432           19,438


COSTS AND EXPENSES:

       Cost of service and operations                      16,918         8,201             24,646           17,074
       Cost of equipment sold                               5,415         7,123              9,296           12,565
       Sales and advertising                                4,693         3,042              7,686            6,263
       General and administrative                           5,807         2,858              9,466            7,635
       Depreciation and amortization                       14,457        11,609             25,146           22,072
                                                          -------       -------           --------         --------

       Operating Loss                                     (24,880)      (22,080)           (43,808)         (46,171)


INTEREST AND OTHER  INCOME                                  1,491            86              1,632            1,031
INTEREST EXPENSE                                          (12,793)      (12,650)           (26,619)         (24,272)
                                                          --------      --------           --------         --------


NET LOSS                                                 $(36,182)     $(34,644)          $(68,795)        $(69,412)
                                                         =========     =========          =========        =========

</TABLE>














<PAGE>



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

<TABLE>
<CAPTION>

                                                                                 June 30,     December 31,
ASSETS                                                                            1998            1997
                                                                                  ----            ----


CURRENT ASSETS:

<S>                                                                            <C>             <C>   
   Cash and cash equivalents                                                     $8,944          $2,106
   Inventory                                                                     37,887          40,321
   Accounts receivable-trade, net of allowance for doubtful accounts             13,279           8,140
   Restricted cash-current portion                                               41,038              --
   Prepaid in-orbit insurance                                                     1,993           4,564
   Other current assets                                                          14,638           9,608
                                                                                --------        -------
      Total current assets                                                      117,779          64,739

PROPERTY AND EQUIPMENT - NET                                                    282,422         250,335
GOODWILL AND INTANGIBLE - NET                                                    54,347              --
RESTRICTED CASH - Non-Current                                                    63,157              --
DEFERRED CHARGES AND OTHER ASSETS - NET                                          49,371          36,722
                                                                                --------        -------

       Total assets                                                            $567,076        $351,796
                                                                               =========       =========

LIABILITIES AND STOCKHOLDERS' EQUITY


CURRENT LIABILITIES:

   Accounts payable and accrued expenses                                        $40,644         $35,825
   Obligations under capital leases due within one year                           3,687             798
   Current portion of long-term debt                                              3,006          15,254
   Other current liabilities                                                      7,673           7,520
                                                                                --------        --------
      Total current liabilities                                                  55,010          59,397


DUE TO PARENT                                                                        --         441,836



LONG-TERM LIABILITIES:

   Obligations under Bank Financing                                              22,000         198,000
   Senior Notes, net of discount                                                326,722              --
   Capital lease obligations                                                     10,163           3,147
   Other long-term debt                                                           1,003           1,364
   Net assets acquired in excess of purchase price                                2,376           2,725
   Other long-term liabilities                                                      563             647
                                                                                --------        --------

      Total long-term liabilities                                               362,827         205,883

      Total liabilities                                                         417,837         707,116
                                                                                --------        -------


STOCKHOLDERS' EQUITY                                                            149,239        (355,320)
                                                                                --------       ---------


      Total liabilities and stockholders' equity                               $567,076        $351,796
                                                                               ==========      ========

</TABLE>



<PAGE>



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

<TABLE>
<CAPTION>


                                                                      Six Months Ended
                                                                          June 30,
                                                                ------------------------------
                                                                          1998           1997
                                                                      --------      ---------

CASH FLOWS USED IN OPERATING ACTIVITIES:
<S>                                                                   <C>             <C>    
Net loss                                                              $(68,795)       ($69,412)
Adjustments to reconcile net loss to net cash used in
operating activities:
             Amortization of debt discount                               5,318           4,297
             Depreciation and amortization                              24,747          22,072
             Changes in assets and liabilities:
                 Inventory                                               1,889          (7,426)
                 Prepaid in-orbit insurance                              2,571           3,387
                 Trade accounts receivable                               1,941          (2,142)
                 Other current assets                                      (48)          5,565
                 Accounts payable and accrued expenses                   1,201          (8,536)
                 Deferred trade payables                                (7,680)             --
                 Deferred items - net                                     (124)            305
                                                                          -----         -------

Net cash used in operating activities                                  (38,980)        (51,890)


CASH FLOWS USED IN INVESTING ACTIVITIES:

Additions to property and equipment                                     (5,558)         (5,804)
Acquisition of ARDIS                                                   (51,440)             --
Purchase of long-term restricted cash securities                      (113,747)             --
                                                                      ---------        -------

Net cash used in investing activities                                 (170,745)         (5,804)

CASH FLOWS FROM FINANCING ACTIVITIES:

Funding (to) from Parent                                               (21,303)         13,035
Principal payments under capital leases                                 (1,234)         (1,882)
Proceeds from Bank Financing                                            24,000          53,000
Repayment of Bank Financing                                           (100,000)             --
Proceeds from bridge financing                                          10,000              --
Repayment of bridge financing                                          (10,000)             --
Proceeds from Senior Notes                                             335,000              --
Payments on long-term debt                                              (4,933)         (5,225)
Debt issuance costs                                                    (14,967)           (611)
                                                                       --------         -------

Net cash provided by  financing activities                             216,563          58,317

Net increase (decrease) in cash and cash equivalents                     6,838             623

CASH AND CASH EQUIVALENTS, beginning of period                           2,106           2,182
                                                                         ------         ------
CASH AND CASH EQUIVALENTS, end of period                                $8,944          $2,805
                                                                        =======         ======



</TABLE>



<PAGE>



                           PART I-FINANCIAL STATEMENTS

                 Item 2. Management's Discussion and Analysis of
              Interim 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 Annual Report,  including those regarding the
Company's financial position,  business strategy,  projected costs and financing
needs,  and plans and  objectives  of  management  for  future  operations,  are
forward-looking statements.  Although the Company believes that the expectations
reflected in such  forward-looking  statements are  reasonable,  there can be no
assurance  that  such  expectations  will  prove to have been  correct.  Because
forward-looking statements involve risks and uncertainties, the Company's actual
results  could  differ  materially.  Important  factors  that could cause actual
results  to  differ  materially  from the  Company's  expectations  ("Cautionary
Statements")  are disclosed under  "Business" and  "Management's  Discussion and
Analysis of Financial  Condition  and Results of  Operations,"  and elsewhere in
this  Form  10-Q,  including,   without  limitation,  in  conjunction  with  the
forward-looking  statements  included in this Form 10-Q.  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  and  Form  10-Q  Quarterly  Reports  filed by the  Company  prior to and
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.

American Mobile  Satellite  Corporation was  incorporated in May 1988 and, until
1996,  was a  development  stage  company,  engaged  primarily  in  the  design,
development,  construction,  deployment  and  financing  of a  mobile  satellite
communication  system.  On March 31, 1998 the Company (through its newly-formed,
wholly-owned subsidiary,  AMSC Acquisition Company, Inc.) acquired ARDIS Company
("ARDIS"),  a wholly-owned  subsidiary of Motorola Inc. that owns and operates a
two-way  wireless  data  communications   network,   for  a  purchase  price  of
approximately  $50 million in cash and $50 million in the Company's Common Stock
and warrants (the "Purchase Price").  With the acquisition of ARDIS, the Company
becomes a leading  provider  of  nationwide  wireless  communications  services,
including data, dispatch and voice services,  primarily to business customers in
the United  States.  The  Company  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").

In connection with the  Acquisition,  the Company and its  subsidiaries  entered
into agreements with respect to the following  financings and refinancings:  (1)
$335  million of Units;  (2) the  restructuring  of its  existing  $200  million
Revolving  Credit Facility and Term Loan Facility  (collectively,  the "New Bank
Financings");  and (3) $10 million  commitment  with respect to Motorola  vendor
financing.  See "Management's Discussion and Analysis of Financial Condition and
Results of  Operations  - Liquidity  and Capital  Resources."  Additionally,  in
connection with the Acquisition and related financing,  the Company  transferred
all of its rights, title and interests in AMSC Subsidiary Corporation,  American
Mobile  Satellite  Sales  Corporation,  and AMSC  Sales  Corp.  Ltd.  (together,
"American Mobile Subsidiaries") to Acquisition Company.



<PAGE>



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

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


Overview
- --------

Each of American  Mobile and ARDIS  incurred  significant  operating  losses and
negative cash flows in each year since it commenced operations, due primarily to
start-up  costs,  the costs of developing and building each network and the cost
of developing,  selling and providing its respective products and services.  The
Company is, and will continue to be, highly leveraged.  As of June 30, 1998, the
Company had indebtedness of approximately $466.6 million.

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

As of June 30, 1998, there were approximately 91,700 units on the Network.


Quarter Ended June 30, 1998 and 1997
- ------------------------------------

Service  revenues,  which  include both the Company's  voice and data  services,
approximated  $16.7 million and $23.1 million for the  three-month and six-month
periods ended June 30, 1998,  respectively,  which  constitutes an $11.7 million
and $14.0 million increase over the three-month and six-month periods ended June
30, 1997,  respectively.  The significant increase in service revenues year over
year is primarily  attributable to the income of the ARDIS data service.  Absent
the acquisition of ARDIS on March 31, 1998, service revenues for the three-month
and six-month  period ended June 30, 1998,  respectively,  increased 36% and 44%
year to year,  from $5.0  million and $9.1  million for the three and  six-month
periods ended June 10, 1997, to $6.7 million and $13.2 million for the three and
six-month periods ended June 30, 1998, respectively.  Service revenue from voice
services  increased 39% and 54% from approximately $2.4 million and $4.3 million
in the second quarter and  six-months of 1997,  respectively,  to  approximately
$3.5 million and $6.7 million in the  comparable  periods of 1998. The increases
were  primarily a result of a 54% increase in voice  customers  during the first
half of 1998 as compared to the same period in 1997.  Service  revenue  from the
Company's  data  services  approximated  $12.3 million and $14.5 million for the
three-month and six-month periods ended June 30, 1998, respectively, as compared
to $1.9 million and $3.5 million for the comparable  periods of 1997. The dollar
increases  of $10.4  million and $11.0  million are  primarily a result of a 33%
increase  in mobile  data units  during the first half of 1998 and $9.9  million



<PAGE>



from the ARDIS data service. Service revenue from capacity resellers, who handle
both voice and data  services,  approximated  $852,000 in the second  quarter of
1998 and $1.6 million for the  six-months  ended June 30,  1998,  as compared to
$608,000 and $1.1 million for the same periods of 1997,  an increase of $244,000
and $531,000, or 40% and 47%, respectively.

Revenue from the sale of mobile data terminals and mobile  telephones  decreased
10% from $10.3  million  in the first half of 1997 to $9.3  million in the first
half of 1998 and,  similarly,  by 2% from $5.8  million  to $5.7  million in the
second  quarter  of 1997 and 1998,  respectively.  The  decrease  was  primarily
attributable  to  reduced  sales of voice  products,  as well as  certain  price
reductions  made in the first  quarter of 1998.  ARDIS  equipment  sales for the
second quarter were $384,000.

Cost of service and operations  for the  three-months  and the six-months  ended
June 30, 1998,  which includes costs to support  subscribers  and to operate the
Network,  was $16.9 million and $24.7 million compared to $8.2 million and $17.1
million  for the same  periods of 1997.  Cost of service  and  operations,  as a
percentage  of revenues,  was 76% for the second  quarters of both 1998 and 1997
and 76% and 88% for the first  six-months  of 1998 and 1997,  respectively.  The
increase in cost of service and  operations  was primarily  attributable  to (i)
$9.1 million of ARDIS costs (ii) increased  interconnect charges associated with
increased  service usage offset by (iii) a reduction in  information  technology
costs  affected by reducing the  dependence on outside  consultants.  Absent the
acquisition  of ARDIS on March 31, 1998,  cost of service and operations for the
three-month  and six-month  period ended June 30, 1998,  respectively,  was $7.9
million and $15.6 million, and represented approximately 35% and 48% of revenue,
compared to $8.2 million and $17.1 million for the same periods in 1997.

The cost of equipment sold decreased 24% from $7.1 million for the  three-months
ended June 30, 1997, to $5.4 million for the  three-months  ended June 30, 1998,
and 26% from $12.6 million for the six-month period ended June 30, 1997, to $9.3
million  for the  same  period  in  1998.  The  dollar  decrease  in the cost of
equipment sold was primarily  attributable  to (i) a  corresponding  decrease in
voice equipment sales and (ii) the impact of the inventory  valuation  allowance
recorded in the fourth quarter of 1997.

Sales and  advertising  expenses  were $4.7  million  and $7.7  million  for the
three-months and the six-months ended June 30, 1998,  respectively,  compared to
$3.0  million  and  $6.3  million  for the  same  periods  in  1997.  Sales  and
advertising  expenses as a percentage  of revenue were 21% and 24% in the second
quarter and first half of 1998, respectively,  as compared to 28% and 32% during
the same  periods of 1997.  The increase in sales and  advertising  expenses was
primarily  attributable  to ARDIS.  Absent the acquisition of ARDIS on March 31,
1998,  sales and advertising  expenses for the three-month and six-month  period
ended  June 30,  1998 were $3.2  million  and $6.3  million,  respectively,  and
represented 15% and 20% of revenue,  respectively,  compared to $3.0 million and
$6.3 million, or 28% and 32% of revenue, for the same periods in 1997.

General and  administrative  expenses for the  three-months  and the  six-months
ended June 30, 1998, were $5.8 million and $9.4 million, respectively,  compared
to $2.9 million and $7.8 million in the same periods of 1997. As a percentage of
revenue,  general and  administrative  expenses  represented  26% and 29% in the
second quarter and first half of 1998, respectively,  compared to 27% and 40% in
the same periods of 1997.  The increase in general and  administrative  expenses
for 1998  compared to 1997 was primarily  attributable  to $2.1 million of ARDIS
costs  offset by a  $741,000  reduction  in  personnel  expenses  as a result of
reduced  headcount.  Absent the acquisition of ARDIS on March 31, 1998,  general
and administrative  expenses for the three-month and six-month period ended June
30, 1998 were $3.6 million and $7.3 million, respectively, approximating 16% and
22% of revenue, compared to $2.9 million and $7.8 for the same periods in 1997.

Depreciation  and  amortization  expense was $14.4 million and $24.6 million for
the  three-months  and  the  six-months  ended  June  30,  1998,   respectively,
representing  approximately  65% and 76% of revenue for the respective  periods.
During the same periods of 1997 depreciation and amortization  expense was $11.1
million and $21.0 million,  approximating 103% and 108% of revenue. The increase
in  depreciation  and  amortization  expense was primarily  attributable  to the
addition of ARDIS assets and amortization of goodwill  associated with the ARDIS
acquisition. Absent the acquisition of ARDIS on March 31, 1998, depreciation and
amortization  expense for the  three-month  and six-month  period ended June 30,
1998 was $10.4 million and $20.5 million,  respectively,  approximating  46% and
63% of revenue, compared to $11.1 million and $21.0 million for the same periods
in 1997.

Interest  and other  income was $1.6  million  and $1.7  million  for the second
quarter  and first half of 1998,  respectively,  as compared to $86,000 and $1.0
million for the same periods in 1997.  The  increase  was  primarily a result of
interest  earned on escrows  required  under the terms of the $335  million debt
offering at the end of the first quarter. The Company incurred $15.7 million and
$22.3 million of interest  expense in the second  quarter and first half of 1998



<PAGE>



compared to  $5.3 million  and  $9.7  million  for the  same  periods  in  1997,
reflecting (i) the  amortization of debt discount and debt offering costs in the
amount of $5.9 million in 1998, compared to $4.3 million in 1997 and (ii) higher
outstanding loan balances as compared to 1997.

Interest  expense  in the  first  half of 1998 was  significant  as a result  of
borrowings  under  the Bank  Financing,  the  amortization  of  borrowing  costs
incurred in conjunction with securing the facility,  and interest accrual on the
Notes issued in the ARDIS  acquisition . It is  anticipated  that interest costs
will  continue  to be  significant  as a result  of the Bank  Financing,  Bridge
Financing, and Acquisition, (see "Liquidity and Capital Resources").

Net capital expenditures,  for the first half of 1998 for property and equipment
were $5.6 million compared to $5.8 million for the same period in 1997.

Liquidity and Capital Resources
- -------------------------------

$335 Million Unit Offering
- --------------------------

In connection with the  Acquisition,  discussed  above,  the Company issued $335
million of Units (the "Units")  consisting of 12 1/4% Senior Notes due 2008 (the
"Notes"),  and Warrants to purchase shares of Common Stock of the Company.  Each
Unit  consists of $1,000  principal  amount of Notes and one Warrant to purchase
3.75749  shares of Common  Stock at an exercise  price of $12.51 per share.  The
Warrants were valued at $8.5 million and are reflected in the balance sheet as a
debt discount.  A portion of the net proceeds of the sale of the Units were used
to finance  the  Acquisition.  In  connection  with the Notes,  the  Company has
purchased  approximately  $112.3 million of pledged securities that are intended
to provide for the payment of the first six interest  payments on the Notes. The
Company  incurred  approximately  $15  million  in  costs  associated  with  the
placement  of  the  Notes  and  the  Acquisition.   Interest  payments  are  due
semi-annually, in arrears, beginning October 1, 1998.

Acquisition  Company  consummated  its  offer  to  exchange  up to $335  million
aggregate  principal  amount of its  registered 12 1/4 percent Senior Notes (due
2008,  Series B) (the "New Notes") for  outstanding  unregistered 12 1/4 percent
Senior Notes (due 2008,  Series A) (the "Old  Notes").  The exchange  expired at
5:00 p.m. (New York City time) on Friday,  August 7, 1998.  Holders tendered for
exchange $334.75 million  aggregate  principal amount of the Old Notes as of the
expiration of the offer. The Old Notes tendered for exchange  constituted 99.93%
of the Old Notes outstanding.

The Notes  contain  covenants  that,  among other  things,  limit the ability of
Acquisition Company, Inc. 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.


New Bank Financing
- ------------------

In connection with the Acquisition, the Company, the Acquisition Company and its
subsidiaries  restructured  the existing $200 million Bank  Financing (the "Bank
Financing") to provide for two facilities:  (i) the Revolving Credit Facility, a
$100 million unsecured  five-year reducing  revolving credit facility,  and (ii)
the Term Loan Facility, a $100 million five-year,  term loan facility with up to
three  additional  one-year  extensions  subject to the lenders'  approval.  The
Revolving Credit Facility bears an interest rate, generally,  of 50 basis points
above  LIBOR and is  unsecured,  with a  negative  pledge  on the  assets of the
Acquisition Company and its subsidiaries  ranking pari passu with the Notes. The
Revolving  Credit  Facility will be reduced $10 million each quarter,  beginning
with the quarter ending June 30, 2002, with the balance due on maturity of March
31, 2003.  Borrowings under the Revolving Credit Facility are subject to certain
conditions  beginning in the fourth quarter of 1998. In the event the Company is
unable to borrow amounts under the Revolving Credit Facility, the Company's cash
needs will  significantly  exceed its  available  resources,  which would have a
material adverse effect on the Company. The revolving Credit Facility ranks pari
passu with the  Notes.  The Term Loan  Facility  is secured by the assets of the
Company,  principally its stockholdings in AMRC and the Acquisition Company, and
will be effectively subordinated to the Revolving Credit Facility and the Notes.
The New Bank Financing is severally guaranteed by Hughes Electronics Corporation
("Hughes"),  Singapore  Telecommunications  Ltd. ("Singapore Telecom") and Baron
Capital  Partners,  L.P. (the "Bank Facility  Guarantors").  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
re-pricing of 5.5 million warrants  previously issued (together,  the "Guarantee
Warrants").  The Guarantee  Warrants  have an exercise  price of $12.51 and have
been valued at approximately $17.7 million. As of July 31, 1998, the Company had
outstanding borrowings of $100 million of the Term Loan Facility at 6.1875%, and
$27 million under the Revolving Credit Facility at 6.1875%.



<PAGE>



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,  and
fixes  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 on a quarterly  basis, on a notional amount of
$100  million  until the  termination  date of March 31,  2001.  The Company 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.

Motorola Vendor Financing
- -------------------------

Motorola has entered into an agreement with a subsidiary of Acquisition Company,
the ARDIS Company, to provide up to $10 million of vendor financing (the "Vendor
Financing  Commitment"),  which  will be  available  to finance up to 75% of the
purchase price of additional  network base  stations.  Loans under this facility
will bear  interest at a rate equal to LIBOR plus 7.0% and will be guaranteed by
the Company and each  subsidiary of the  Acquisition  Company.  The terms of the
facility  require that amounts  borrowed be secured by the  equipment  purchased
therewith. No amounts were outstanding under this facility as of July 31, 1998.

Financing Summary
- -----------------

The Company  believes the proceeds  from the issuance of the Notes,  net of cash
used for the  Acquisition,  together  with  the  borrowings  under  the New Bank
Financing  and the  Vendor  Financing  Commitment,  will be  sufficient  to fund
operating losses, capital expenditures, working capital, and scheduled principal
and interest payments on debt through 1998 and beyond;  however, there can be no
assurance  that the Company's  current  projections  regarding the timing of its
ability to achieve positive  operating cash flow will be accurate,  and that the
Company will not need additional financing in the future.

AMRC
- ----

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

Deferred Trade Payables
- -----------------------

In the last quarter of 1997 and the first quarter of 1998, the Company  arranged
the financing of certain trade  payables,  and as of June 30, 1998, $4.0 million
of deferred trade  payables were  outstanding at rates ranging from 6.23% to 12%
and are generally payable by the end of 1998.

Purchase and Lease of Satellite
- -------------------------------

As  previously  disclosed,  the Company has entered into certain  agreements  to
acquire a one-half ownership interest in TMI Communications and Company, Limited
Partnership's ("TMI") satellite, MSAT-1, at a cost of $60 million payable over a
five-year  period,  as well as entered  into  five-year  lease of the  Company's
satellite,  MSAT-2,  with  African  Continental   Telecommunications  Ltd.  that
provides for aggregate lease payments to the Company of $182.5 million.  Closing
under  the  agreements  is  subject  to a number  of  conditions,  including:  a
successful financing by ACTEL of at least $120 million and completion of certain
satellite testing, inversion and relocation activities with respect to AMSC-1.
It is  anticipated that the closing under both the purchase and lease agreements
will occur simultaneously in the third quarter of 1998.

Other
- -----

At June 30, 1998, the Company had remaining contractual  commitments to purchase
both  mobile data  terminal  inventory  and mobile  telephone  inventory  in the
maximum amount of $3.6 million over the next year. Additionally, the Company had
remaining  contractual  commitments  in the  amount  of  $1.7  million  for  the



<PAGE>


development of certain next generation data terminal inventory.  Contingent upon
the  successful  research  and  development  efforts,  the  Company  would  have
additional  contractual  commitments  for mobile  communications  data  terminal
inventory in the amount of $31.2 million over a three-year  period.  The Company
has the right to  terminate  this 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.

On  July  2,  1998,   the  Company  filed  an   application   with  the  Federal
Communications   Commission   ("FCC")  to  construct   and  launch  a  follow-on
geostationary  mobile satellite for its business.  The filing of the application
does not  commit  the  Company  to expend any  resources  toward  this  project;
however,  should the  Company  decide to proceed  with the  construction  of the
follow-on  satellite,  the  Company  would  be  required  to  raise  substantial
additional capital to fund this project.

Cash used in  operating  activities  for the first six  months of 1998 was $32.4
million as compared to $37.5  million for the same period of 1997.  The decrease
in cash used in  operating  activities  was  primarily  attributable  to reduced
inventory spending. Cash used by investing activities was $198.9 million for the
first six months of 1998 compared to $7.3 million during the first six months of
1997. The increase was primarily  attributable  to the  acquisition of ARDIS and
the funding of certain  escrows  required in connection with the Acquisition and
issuance of Notes.  Cash  provided by financing  activities  was $238.1  million
during  the first six months of 1998 as  compared  to $45.4  million  during the
first six months of 1997,  reflecting (i) the proceeds from the Notes, offset by
(ii) the  repayment  of a portion  of the Bank  Financing  and (iii)  payment of
financing fees  associated  with the  acquisition  of the Notes.  As of June 30,
1998,  the Company  had $8.9  million of cash and cash  equivalents  and working
capital of $68.7 million.


Other Matters
- -------------

In June 1997, the Financial Accounting Standards Board ("FASB") issued Statement
of Financial  Accounting  Standards ("SFAS") No. 130,  "Reporting  Comprehensive
Income," and SFAS No. 131,  "Disclosures  about  Segments of an  Enterprise  and
Related Information." The Company adopted both of these standards during the six
month periods ended June 30, 1998.

SFAS No.  130  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 "total comprehensive income" for the
three months and six months ended June 30, 1997 and 1998.

SFAS  No.  131  requires  an  entity  to  disclose   financial  and  descriptive
information  about  its  reportable  operating  segments.  It  also  establishes
standards for related disclosures about products and services, geographic areas,
and  major  customers.  SFAS  No.  131 is not  required  for  interim  financial
reporting  purposes  during 1998. The Company is in the process of assessing the
additional disclosures, if any, required by SFAS No. 131. However, such adoption
will not impact the Company's results of operations or financial position, since
it relates only to disclosures.




<PAGE>
                           PART II - OTHER INFORMATION

                Item 2. Changes in Securities and Use of Proceeds

The Company  believes the proceeds  from the issuance of the Notes,  net of cash
used for the  Acquisition,  together  with  the  borrowings  under  the New Bank
Financing  and the  Vendor  Financing  Commitment,  will be  sufficient  to fund
operating losses, capital expenditures, working capital, and scheduled principal
and interest payments on debt through 1998 and beyond;  however, there can be no
assurance  that the Company's  current  projections  regarding the timing of its
ability to achieve positive  operating cash flow will be accurate,  and that the
Company will not need additional financing in the future.

<PAGE>
                          PART II -- OTHER INFORMATION

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

(a) At the annual meeting of the  stockholders of AMSC held on May 20, 1998, the
matters described under (b) and (c) below were voted upon.

(b) The following nominees,  constituting all of the Company's  directors,  were
elected to the Company's board of directors:
<TABLE>
<CAPTION>


                                                     Individual
                                    Votes For        Votes Withheld             Withheld

<S>                                 <C>                <C>                      <C>      
Douglas I. Brandon                  28,215,889           1,201                  1,163,388
Ho Siaw Hong                        28,216,389             701                  1,162,888
Pradeep P. Kaul                     28,216,389             701                  1,162,888
Billy J. Parrott                    28,216,469             621                  1,162,808
Gary M. Parsons                     28,216,314             776                  1,162,963
Andrew A. Quartner                  28,215,989           1,101                  1,163,288
Jack A. Shaw                        28,216,669             421                  1,162,608
Roderick M. Sherwood, III           27,986,600         230,490                  1,392,677
Michael T. Smith                    28,216,689             401                  1,162,588
Yap Chee Keong                      27,986,265         230,825                  1,393,012
</TABLE>

On June 5, 1998 the Company reported on its Report on 8K dated June 1, 1998 that
Mr. Yap had resigned his position as director of the Company in connection  with
his  resignation  of  employment  from  Singapore  Telecommunications,  Ltd.  As
indicated in that Report,  the position  vacated by Mr. Yap remains vacant until
such time as filled by a vote of the Board of Directors or the stockholders.

(c)(1)  The vote on the  ratification  of  Arthur  Andersen  LLP as  independent
accountants  for the Company for 1998 was 29,371,445  for,  7,732  against,  100
abstaining.

     (2) The vote on the approval of an amendment  to the  Company's  1989 Stock
Option  Plan to  increase  the  number of shares  authorized  for  issuance  was
27,587,129 for, 1,787,564 against, 4,584 abstaining.

     (3) The vote on the  approval of the  issuance  of shares of the  Company's
Common  Stock to  Motorola  Inc.  was  22,128,875  for,  28,195  against,  3,220
abstaining  and  7,218,987  not voting  (including  the shares  held by Motorola
Inc.).


<PAGE>


                           PART II - OTHER INFORMATION

                            Item 5. Other Information



If the Company does not receive notice at its principal  executive offices on or
before March 13, 1999 of a stockholder  proposal for  consideration  at the 1999
annual  meeting of  stockholders,  the proxies named by the  Company's  Board of
Directors with respect to the meeting shall have discretionary  voting authority
with respect to such proposal.


<PAGE>

                           PART II - OTHER INFORMATION

                    Item 6. Exhibits and Reports on Form 8-K

          (a) Exhibits

3.1      -     Restated  Certificate  of  Incorporation  of  AMSC  (as  restated
               effective May 1, 1996)  (Incorporated by reference to Exhibit 3.1
               to the Company's Annual Report on Form 10-K for the period ending
               December 31,1997 (File No. 0-23044))

3.2      -     Amended and  Restated  Bylaws of AMSC (as  amended  and  restated
               effective May 20, 1998) (Incorporated by reference to Exhibit 3.2
               to the  Company's  Annual Report on Form 10-K for the fiscal year
               ending December 31, 1997 (File No. 0-23044))

10.13    -     Amended and Restated Stock Option Plan (as amended  effective May
               20, 1998)  (Incorporated  by  reference  to Exhibit  10.13 to the
               Company's   Registration   Statement   on  Form  S-8  (Reg.   No.
               333-53253))

10.67    -     Credit  Agreement by and between  Motorola Inc. and ARDIS Company
               dated June 17, 1998 (filed herewith)

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

27.0     -     Financial Data Schedule (filed herewith)


          (b) Reports on Form 8-K:

On June 5, 1998, the Company filed a Current  Report on Form 8-K,  describing in
response to Item 5-Other Events, the resignation of director Yap Chee Keong.



<PAGE>




                                    SIGNATURE

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: August 14, 1998               By:/s/Stephen D. Peck
                                       -------------------------------------
                                                 Stephen D. Peck
                                    Vice President and Chief Financial Officer
                                    (principal financial and accounting officer)







<PAGE>



                                  EXHIBIT INDEX



Number            Description

3.1      -     Restated  Certificate  of  Incorporation  of  AMSC  (as  restated
               effective May 1, 1996)  (Incorporated by reference to Exhibit 3.1
               to the Company's Annual Report on Form 10-K for the period ending
               December 31,1997 (File No. 0-23044))

3.2      -     Amended and  Restated  Bylaws of AMSC (as  amended  and  restated
               effective May 20, 1998) (Incorporated by reference to Exhibit 3.2
               to the  Company's  Annual Report on Form 10-K for the fiscal year
               ending December 31, 1997 (File No. 0-23044))

10.13    -     Amended and Restated Stock Option Plan (as amended  effective May
               20, 1998)  (Incorporated  by  reference  to Exhibit  10.13 to the
               Company's   Registration   Statement   on  Form  S-8  (Reg.   No.
               333-53253))

10.67    -     Credit  Agreement by and between  Motorola Inc. and ARDIS Company
               dated June 17, 1998 (filed herewith)

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

27.0     -     Financial Data Schedule (filed herewith)





<PAGE>



                                CREDIT AGREEMENT


         THIS  CREDIT  AGREEMENT  is  entered  into as of June  17,  1998 by and
between  Motorola Inc., a Delaware  corporation,  (hereinafter  "Motorola")  and
ARDIS Company, a New York general partnership (the "Borrower" or "you").

         You have asked Motorola to provide financing to you (the "Credit")  for
the purchase of certain equipment from Motorola.  Motorola is willing to provide
the Credit on the terms and  conditions  set forth in this Credit  Agreement and
the attached  Exhibits,  which are part of this Credit Agreement.  The terms and
conditions ("Terms and Conditions") attached to this Credit Agreement as Exhibit
"A" include definitions for many of the terms used below.

         1. Amount of Credit;  Note. The aggregate  maximum  principal amount of
            -----------------------
Credit that may be drawn under this Credit  Agreement shall be $10,000,000.  You
may obtain Advances under this Credit  Agreement until June 16, 2000, if, at the
time of requesting  an Advance,  you have  complied  with all  Requirements  for
Advances.  Amounts  repaid under this Credit  Agreement may not be  re-borrowed.
Motorola  shall have no  obligation,  express or implied,  to extend or to grant
additional  credit  after this Credit  Agreement  expires.  The Credit  shall be
evidenced by a promissory  note ("Note") in  substantially  the form attached as
Exhibit "B" duly executed on behalf of the Borrower.

         2. Drawdown  Procedure.  At the time you order equipment from Motorola,
            -------------------
you will  notify  Motorola in writing on the  purchase  order that you intend to
finance  the  purchase  with  Motorola  under this  Credit  Agreement,  and will
identify the location (by State and county) at which each item of equipment  may
be located during the term of this Agreement. By issuing that notice you will be
deemed to represent  and warrant that all prior  statements  of your account are
correct.  Upon  shipment  of each  such  item of  equipment,  provided  that all
Requirements for Advances have been satisfied,  if the Requirements for Advances
have been satisfied,  Motorola shall thereupon be deemed to have made an Advance
equal to 75% of the purchase price of such item of equipment, and Motorola shall
make a  notation  on its books and  records,  and on the  schedule  to the Note,
showing  such  Advance.  On each  Quarterly  Date during the term of this Credit
Agreement,  the aggregate amount of the Advances made since the date hereof,  or
if later,  since the date of the most recent  Quarterly Date, shall constitute a
Loan, which shall bear interest at the Applicable Rate and amortize as set forth
herein. You hereby irrevocably  authorize Motorola at any time to endorse on the
Note (or record on its books and  records)  the date and amount of any  Advances
made by Motorola to you,  the  outstanding  balance of all Advances and Loans at
any time and each payment and prepayment of any principal plus interest accruing
thereon.  Such  endorsement  or  record  shall be prima  facie  evidence  of the
principal  amount  owing on the Note in any  proceedings  to enforce the payment
thereof;   provided,  that  failure  to  record  an  Advance  or  any  erroneous
recordation shall not affect  Borrower's  obligations to repay all sums actually
borrowed  hereunder.  No Advance or deemed  Advance  shall be permitted  for any
payment of  principal  or interest  due under the Note.  You will  receive  from
Motorola,  on or about the Thursday immediately preceding the last Monday of the
month,  an  itemized  list of  equipment  provided to you during the most recent
monthly  period.  You will pay to Motorola,  within thirty days from the invoice
date,  the full amount of the purchase price for equipment and services shown on
such invoice,  less the amount of any Advances made for the purchase of any such
equipment as provided above.

         3.       Interest Rate.  You agree to pay interest to Motorola  on  the
                  --------------
principal  amount of the Credit  outstanding from time to time. If the Credit is
not in Default,  you will pay interest each quarter in arrears at the Applicable
Rate.  If, and as long as, the Credit is in Default,  the interest  rate will be
increased  another three percent (3%) per annum above the  Applicable  Rate (the
"Default  Rate") and will be payable upon  demand.  As detailed in the Terms and
Conditions,  under no circumstances will you be required to pay an interest rate
or an amount of interest greater than the maximum interest allowed by applicable
law.

         4.       Repayment Terms.  Motorola  will  send  you quarterly invoices
                  --------------- 
showing  principal  and interest due. You agree to pay each invoice on or before
its due date. The principal  portion of each Loan will be amortized over a three
year period  beginning with the Quarterly Date on which such Loan commences,  in
twelve consecutive equal quarterly installments.  You agree to pay a late charge
equal  to five  percent  (5%) of any  principal  amount  payable  by you for any
invoice  payment not received by Motorola  within ten days of the due date. Your
failure to pay an invoice  within  fifteen days of its due date  constitutes  an
Event of Default under this Credit Agreement.

         5.  Financial Information.  Motorola  has  agreed to provide the Credit
             --------------------- 
based on financial information you have prepared and supplied.  Between the date
of the financial information and the date of this Credit Agreement,  you confirm
that there has been no material,  adverse change in your financial  condition or
business operation. As described in the Terms and Conditions,  you agree to give
Motorola  updated   financial   information   during  the  time  the  Credit  is
outstanding.

         6.  Collateral.  As security for the timely payment and  performance of
             ----------
your  Obligations,  you hereby  grant to Motorola a  perfected,  first  priority
security  interest and lien in the  Collateral.  At the time of delivery of each
purchase order as described in Section 2 above,  you will deliver to Motorola an
executed Financing  Statement on form UCC-1 substantially in the form of Exhibit
"E" to this Agreement for filing in each  jurisdiction  identified as a location
where the equipment ordered may be located during the term of the Agreement. You
hereby authorize Motorola to attach to each such Financing  Statement a schedule
listing  the serial  numbers or other  identifying  information  describing  the
equipment  shipped  in  accordance  with the  purchase  order,  and to file such
Financing  Statements  in each  jurisdiction  in  which  it  deems  such  filing
necessary to perfect Motorola's  security interest in the Collateral.  You agree
to execute such other  documents and take all  reasonable  actions  requested by
Motorola,  at your expense, to perfect and maintain the perfection of Motorola's
security interest in the Collateral.

         The Credit will also be secured by the joint and several  Guarantees of
the Guarantors listed on Exhibit "C",  guaranteeing  repayment of the Credit (in
accordance with Guarantee Agreements in the form attached as Exhibit "C").

         7.  Waiver  of Jury  Trial.  YOU AND  MOTOROLA  AGREE  THAT ANY  CLAIM,
             ----------------------
COUNTERCLAIM,  SETOFF,  OR  DEFENSE  RELATING  IN ANY WAY TO (A) THIS  AGREEMENT
(INCLUDING ALL EXHIBITS AND ALL OTHER DOCUMENTS RELATING TO THIS AGREEMENT),  OR
(B) ANY ACTION, OMISSION, COURSE OF CONDUCT,  PRACTICE, OR TRANSACTION BY YOU OR
MOTOROLA  (INCLUDING  THE RESPECTIVE  OFFICERS,  DIRECTORS,  EMPLOYEES,  AGENTS,
ATTORNEYS, AND OTHER REPRESENTATIVES OF EACH) SHALL BE HEARD AND DETERMINED BY A
COURT  WITHOUT A JURY.  YOU AND MOTOROLA  HAVE  ENTERED  INTO THIS  AGREEMENT IN
RELIANCE UPON THIS PROVISION AS A MATERIAL TERM OF THE CREDIT.

         8.  Governing Law. Motorola's headquarters are in Schaumburg, Illinois;
             ------------- 
this Credit  Agreement  will,  if accepted and  executed by  Motorola,  become a
contract  in the  State of  Illinois  and be  governed  by the law of  Illinois,
without  regard to its conflicts of law rules.  Upon the occurrence of any Event
of Default,  however,  Motorola shall also have the right to enforce this Credit
Agreement and related  collateral  documents in accordance  with the laws of any
jurisdiction in which an Obligor or Collateral may then be located,  or in which
the law permits Motorola to bring suit.

         9. No Other Agreements;  Complete Review. You and Motorola  acknowledge
            -------------------------------------
and agree that this Credit Agreement and the other documents  executed  pursuant
to this Agreement collectively comprise the complete written agreement regarding
the Credit;  there are no other  understandings,  inducements,  representations,
negotiations,  or promises of any kind other than those  written  here and those
made a part of this Credit  Agreement.  You and Motorola also  acknowledge  that
they have  reviewed,  with  their  own  attorneys  if  desired,  all the  terms,
conditions, and provisions of this Credit Agreement and the attached Exhibits.

         10.      Limitation on Liability.  In  no event shall Motorola have any
                  -----------------------
liability  under or in  connection  with this  Credit  Agreement  or any exhibit
hereto for special, incidental,  indirect, or consequential damages of any sort,
including  (without  limitation) lost profits.  If you have previously  obtained
financing  from  Motorola or  otherwise  purchased  equipment  or services  from
Motorola:

                  (a) you hereby  release  Motorola and its officers, directors,
and employees  from and against any claim,  counterclaim,  defense,  setoff,  or
other  liability with respect to any  transaction,  course of dealing,  or other
matter that arose or occurred before you signed this Credit Agreement, and

                  (b) you acknowledge that any prior credit terms or agreements,
whether written or oral (but excluding any open account arrangements),  have now
been superseded and replaced by this Credit Agreement.

         11. Absolute  Obligation.  ANY  PRESENT OR FUTURE  LAW TO THE  CONTRARY
NOTWITHSTANDING,  YOUR  OBLIGATION  TO PAY MOTOROLA ALL AMOUNTS DUE HEREUNDER IS
ABSOLUTELY UNCONDITIONAL. YOU SHALL NOT BE ENTITLED TO ANY ABATEMENT, REDUCTION,
SETOFF, COUNTERCLAIM, DEFENSE, INTERRUPTION,  DEFERMENT, RECOUPMENT OR DEDUCTION
WITH  RESPECT TO ANY  PRINCIPAL  OR  INTEREST  PAYMENT OR ANY OTHER SUM  PAYABLE
HEREUNDER, NO MATTER HOW, WHEN OR AGAINST WHOM ASSERTED, ARISING OR CLAIMED, NOR
SHALL ANY OF YOUR OBLIGATIONS  HEREUNDER BE AFFECTED FOR ANY REASON  WHATSOEVER.
The  foregoing  shall not be deemed to amend or limit your right to make a claim
against  Motorola for any  obligation  or liability  that Motorola may otherwise
have to you under the Purchase Agreement.

         12. Confidentiality. Neither you nor Motorola will disclose this Credit
             --------------- 
Agreement  or its terms to a third  party  except (a) insofar as the third party
has a "need to know" (as in the case of a party's  accountants),  in which  case
the third party will be  instructed  to abide by this  Paragraph  10, (b) in the
event disclosure is necessary to enforce the Credit Agreement or is compelled by
subpoena,  requirement of law, or order of a court of competent jurisdiction, or
(c) by prior written consent of both parties.



<PAGE>







         EXECUTED by the parties as of the date first set forth above:

Notice Address:                                      ARDIS COMPANY
ARDIS Company
10802 Parkridge Boulevard
Reston, VA 20901-5416                                By:/s/Walter V. Purnell Jr.
                                                        ------------------------
Attn: President and Treasurer                           Walter V. Purnell Jr.

Tel.: (703) 758 6000                                 Its:  President
Fax : (703) 758-6111

With a copy to:
ARDIS Company
300 Knightsbridge Parkway
Suite 500
Lincolnshire, IL 60069
Attn: Vice President and Executive Counsel

Tel.: (847) 913-4226
Fax: (847) 913-4755


Notice Address:                                   MOTOROLA INC.
Motorola Credit Corporation
1303 East Algonquin Road
Schaumburg, Illinois  60196
Tel: (847) 725-4502                               By:/s/Michael Faill
                                                     --------------------
Fax: (847) 725-5097
                                                  Its:Sr. Manager
                                                      Worldwide Customer Finance
With a copy to:

Motorola Paging Products Group
5401 N. Beach Street
Mail Stop S22313
Fort Worth, TX  76137
Attn: Customer Finance
Tel: (817) 245-2705
Fax: (817) 245-2236








<PAGE>





                                    EXHIBITS



         A        Terms and Conditions

         B        Form of Promissory Note

         C        List of Guarantors and Form of Guarantee Agreement

         D        List of Subsidiaries of the Borrower

         E        Form of Financing Statement

         F        List of Assumed Names of the Borrower



<PAGE>

                                    EXHIBIT A


                              TERMS AND CONDITIONS


         The following  terms and  conditions  are referred to as the "Terms and
Conditions"  in, and have been made a part of, the Credit  Agreement dated as of
June 17,  1998  between  MOTOROLA  INC.  ("Motorola")  and  ARDIS  COMPANY  (the
"Borrower" or "you").

                                 1. Definitions

         Certain terms of the Credit  Agreement  and these Terms and  Conditions
carry particular meanings when used with initial capital letters, as follows:

         "Advance" means an extension of Credit made under the Credit  Agreement
upon satisfaction of the conditions set forth in the Credit Agreement, including
these Terms and Conditions.

         "Advance  Date" means the date on which an Advance is made or deemed to
be made under the Credit Agreement.

         "Agreement" and "Credit Agreement" mean the Credit Agreement  described
above, these Terms and Conditions, and the other Exhibits attached to the Credit
Agreement.

         "Applicable Rate" means:  (i) from the date  of  an  Advance  until the
immediately  following  Quarterly  Date,  a  rate  of interest equal to thirteen
percent (13%) and (ii) from  the  Quarterly Date which constitutes the Borrowing
Date with respect to a Loan until the date of repayment in full of such Loan,  a
rate  of  interest  equal  to  LIBOR  plus  7.0%.  The  Applicable  Rate will be
calculated on the basis of a 365 or 366 day year, based upon the  actual  number
of days elapsed.

         "Applicable Term" means thirty six months from the applicable Borrowing
Date for repayment of principal.

         "Borrowing  Date"  means  each  Quarterly  Date  on  which  one or more
Advances shall become a Loan under the Credit Agreement.

         "Business Day" means a day other than Saturday, Sunday or any other day
on which  commercial  banks in  Illinois  are  authorized  or required by law to
close.

         "Code" means the Internal Revenue Code of 1986, as amended from time to
time.

         "Collateral" means all of your right, title, and interest in and to any
equipment  purchased  by you  from  Motorola  with  proceeds  from  any  Advance
hereunder,  wherever located, whether now owned or hereafter acquired, including
all substitutions,  accessions,  replacements, or renewals, and all proceeds and
products with respect to any such property (including,  without limitation,  any
insurance proceeds).

         "Default"  means the  occurrence  of any of the  events  or  conditions
specified  in Section 6,  whether or not such event has matured into an Event of
Default through the giving of notice, the lapse of time, or both.

         "Escrowed Funds" means funds held in escrow with respect to amounts due
under the UPS Agreement as set forth in the letter  agreement dated December 31,
1998 between American Mobile Satellite Corporation and Motorola.

         "Event of Default" is defined in Section 6.

         "FCC" means the Federal Communications Commission.

         "Filing  Jurisdiction"  means,  as  to  any  item  of  Collateral,  any
jurisdiction  in  which  Borrower  has  notified  Motorola  that  such  item  of
Collateral may be located, as required under Section 2 of the Agreement, and has
delivered Financing  Statements to Motorola,  as required under Section 6 of the
Agreement, and (after the date which is thirty (30) days following delivery of a
notice to Motorola under Section 4.8.4 hereof), such additional jurisdictions as
are identified in such notice with respect to such item of Collateral.

         "GAAP" means Generally Accepted Accounting  Principles in effect in the
United States of America from time to time.

         "Governmental  Authority" means any nation or government,  any state or
other  political  subdivision  thereof,  and any  entity  exercising  executive,
legislative,  judicial,  regulatory or administrative functions of or pertaining
to government.

         "Guarantor"  means  each of the joint  and  several  guarantors  of the
Borrower's obligations as identified on Exhibit "C" to the Credit Agreement.

         "Indebtedness"  means at a particular  time, your (i)  indebtedness for
financed  money or for the deferred  purchase price of property or services with
respect to which such Person is liable,  contingently or otherwise,  as obligor,
guarantor or otherwise,  or in respect of which you otherwise  assure a creditor
against  loss,  and (ii)  obligations  under leases which have been or should be
recorded,  in  accordance  with  GAAP,  as  capital  leases in  respect of which
obligations you are liable,  contingently or otherwise, as obligor, guarantor or
otherwise,  or with respect to which  obligations you assure a creditor  against
loss.

         "Lease Obligations" means as of the date of any determination  thereof,
your rental  commitments  under leases,  excluding only obligations under leases
which are classified as Indebtedness on your balance sheet.

         "LIBOR"  means  the  three  month  London  Interbank  Offered  Rate (as
published in the Wall Street Journal) on Business Day immediately  preceding the
Quarterly  Date which is the first date of the period during which interest on a
Loan is being calculated.

         "Lien"  means  any  mortgage,  deed of  trust,  pledge,  hypothecation,
assignment,   encumbrance,   lien  (statutory  or  other),   security  interest,
preferential  payment  arrangement  or other  security  agreement or arrangement
(including,  without  limitation,  any conditional sale or other title retention
agreement,  any financing  lease having the same  economic  effect as any of the
foregoing,  and  the  filing  of  any  financing  statement  under  the  Uniform
Commercial Code or comparable law of any jurisdiction).

         "Loan" means the aggregate  principal  amount of Advances made during a
period ending on a Quarterly  Date and beginning on either the Effective Date of
this Agreement or the immediately preceding Quarterly Date.

         "Obligations"  means  all of  each  Obligor's  obligations  (a) for the
payment of money to Motorola, and (b) for the performance of any covenant, term,
provision, or requirement of the Agreement.

         "Obligors"  means  you and  each  of the  Guarantors  obligated  either
personally or through a pledge of property, for repayment of the Credit.

         "Person"  means  an  individual,   partnership,   corporation,  limited
liability company,  business trust, joint stock company,  trust,  unincorporated
association,  joint venture,  Governmental Authority or other entity of whatever
nature.

         "Purchase Agreement" means the Master Purchase Agreement dated December
19, 1997 between Motorola Inc. and ARDIS Company.

         "Requirement  of  Law"  means  as  to  any  Person,   the  articles  of
incorporation,  by-laws or other  organizational or governing  documents of such
Person,  and any law, or  determination  of any  arbitrator  or a court or other
Governmental  Authority,  in each case applicable to or binding upon such Person
or any of its  properties  or to which  such  Person or any of its  property  is
subject.

         "Responsible  Officer"  means  the  chief  executive  officer  or chief
financial  officer  of any  corporation,  or any  other  individual  who is duly
authorized  by the Person  represented  to perform  the duties  required  by the
Agreement.

         "UCC"  means  the  Uniform   Commercial   Code  as  in  effect  in  the
jurisdiction specified in the "governing law" provision of the Credit Agreement.


         Any accounting  terms not fully defined in the Agreement shall have the
meanings given to them under GAAP.


                            2. Principal and Interest

         2.1      Statements.  Motorola will invoice you quarterly for scheduled
                  ----------
principal and interest payments under the Credit.  You will make each payment on
its due date.  If Motorola's statement  of the  balance  or  amount due does not
agree with your records, you will notify Motorola in writing of the amount shown
by  your  records  within  ten  (10) Business Days of your receipt of Motorola's
statement.   Absent such notification,  or manifest error,  Motorola's statement
shall be presumed to be correct.   Nosuch  notification  shall suspend or affect
your duty to make timely payment.

         2.2      Optional Prepayments. You may, at your option, on any Business
                  --------------------
Day,  prepay  the  Credit,  in whole or in part,  upon at least  seven (7) days'
written notice to Motorola  specifying  the date and amount of prepayment.  Such
notice  shall be  irrevocable  and the payment  amount  specified in such notice
shall be due and  payable  together  with  accrued  interest to such date on the
principal  amount being  prepaid.  The principal  amount prepaid for any Advance
which has not become  part of a Loan shall be  $10,000 or an  integral  multiple
thereof or the total remaining amount outstanding.  In the case of prepayment of
any Loan, the principal  amount prepaid shall be the total  remaining  principal
amount of such Loan.

         2.3      Effect of Prepayment.   Any prepayment shall be applied to the
                  --------------------
installments of principal in inverse order of maturity. Any prepayment shall not
relieve  you from  the  obligation  of  paying  the  current  or any  succeeding
installment  until the  Credit is repaid  in full.  Amounts  prepaid  may not be
reborrowed.

         2.4      Maximum Interest Rate and Amount. Under no circumstances shall
                  --------------------------------
you or any  Obligor be  required  to pay  Motorola a rate or amount of  interest
(together  with all  fees and  charges  which  are  treated  as  interest  under
applicable law) that exceeds that permitted by applicable law. If any overcharge
occurs,  (a) it is  inadvertent,  (b) you will  immediately  notify  Motorola in
writing of such  overcharge,  and (c) the overcharge  will be returned to you or
credited to principal, as Motorola may elect.

                        3. Representations and Warranties

         In order to induce  Motorola to enter into the Agreement and to provide
you with the Credit, you hereby represent and warrant to Motorola the following,
except as  otherwise  disclosed  to  Motorola in writing  concurrently  with the
execution of the Agreement:

         3.1 Status.  You are duly incorporated or formed,  and validly existing
             ------  
under the laws of the state of  incorporation  or formation.  You have the power
and authority and the legal right to own and operate your property, to lease the
property  you operate,  and to conduct the  business in which you are  currently
engaged  and in which you  propose to  engage,  (b) are in  compliance  with all
Requirements  of Law except to the extent that the  failure to comply  therewith
could not, in the  aggregate,  have a material  adverse effect on your business,
operations,  assets (taken in the aggregate) or financial  condition,  and could
not materially  adversely affect your ability to perform your obligations  under
the Agreement,  and (c) have qualified to do business in all jurisdictions where
your  ownership,  lease or operation of property or the conduct of your business
requires such qualification or recording,  except to the extent that the failure
to so qualify could not, in the  aggregate,  have a material  adverse  effect on
your  business,  operations,  assets  (taken  in  the  aggregate)  or  financial
condition,  and could not  materially  adversely  affect your ability to perform
your obligations under any of the Agreements.

         3.2 Power and Authority.  You have the power, authority and legal right
             -------------------
to execute,  deliver and perform the Agreement and to borrow hereunder, and have
taken all necessary  action to authorize the Credit on the terms and  conditions
of this Agreement,  and to authorize the execution,  delivery and performance of
the  Agreement  and  the  related  documents   described   therein.   Where  any
Governmental Authority, including without limitation any PUC, requires consents,
filings or authorizations  prior to the Credit, you shall have obtained all such
consents,  filings  or  authorizations.  Other  than such  consents,  filings or
authorizations,  no consent or  authorization or filing with, or other act by or
with respect to any Governmental  Authority,  is required in connection with the
Credit  hereunder  or with the  execution,  delivery,  performance,  validity or
enforceability  of the  Agreement.  The  Agreement  has been duly  executed  and
delivered  and  constitutes  your  legal,  valid and binding  obligation,  which
obligation shall be enforceable  against you in accordance with the terms of the
Agreement,  except as  enforceability  may be limited by applicable  bankruptcy,
insolvency, reorganization, moratorium or similar laws affecting the enforcement
of creditors' rights generally and general equitable principles.

         3.3 No  Violations.  The  execution,  delivery and  performance  of the
             -------------- 
Agreement and the use of the proceeds of the Credit (i) will not violate,  be in
conflict  with,  result  in a breach  of or  constitute  a  default  under,  any
Requirement of Law or any of your contractual obligations,  except to the extent
such violations,  in the aggregate,  could not have a material adverse effect on
(a) your  business,  operations,  assets  (taken in the  aggregate) or financial
condition,  or (b) your ability to perform your obligations under the Agreement,
and (ii) will not result in, or require,  the creation or imposition of any Lien
on any of your  properties  or revenues  pursuant to any  Requirement  of Law or
contractual  obligation,  other  than  pursuant  to the  Agreement.  You  are in
compliance with the Employee  Retirement  Income Security Act of 1974 as amended
from time to time (ERISA),  and neither the execution nor the performance of the
Agreement by you will result in any violation of ERISA. Any benefit plan that is
subject to ERISA has been properly  accounted for in your  Financial  Statements
attached to the Credit Agreement.

         3.4 No Pending Actions. No litigation,  investigation or proceedings of
             ------------------
or before any  arbitrator  or  Governmental  Authority  is pending,  or, to your
knowledge  is  threatened,  against you or,  against any of your  properties  or
revenues  (a)  with  respect  to  the  Agreement  or  any  of  the  transactions
contemplated  thereby,  or (b)  which is  reasonably  expected  to be  adversely
determined,  and which, if adversely determined,  could,  individually or in the
aggregate, have a material adverse effect on your business,  operations,  assets
(taken in the aggregate) or financial condition.

         3.5      No Defaults.  You are not in default  under or with respect to
                  -----------
any  contractual  obligation  where such default could be materially  adverse to
your  business,  operations,  assets  (taken  in  the  aggregate)  or  financial
condition,  or which could  materially  and  adversely  affect  your  ability to
perform your obligations under the Agreement. No Default or Event of Default has
occurred and is continuing.

         3.6      Good Title.   Any of your leases are in full force and effect,
                  ----------
and you  enjoy  peaceful  and  undisturbed  possession  thereunder;  you  have a
recorded  title in fee  simple to all your  owned  real  property,  and good and
marketable title to all your other personal property.

         3.7      Taxes. You have filed or caused to be filed  all material  tax
                  -----
returns which are required by law to be filed,  and have paid all taxes shown to
be due and payable on said returns or on any assessment made by any Governmental
Authority  (other than those the amount or validity of which is currently  being
contested  in good faith by  appropriate  proceedings  and with respect to which
reserves in conformity  with GAAP have been provided on your books);  and no tax
Liens have been filed and, to your knowledge,  no claims are being asserted with
respect to any such taxes,  fees or other charges other than inchoate  Liens for
taxes not yet due.

         3.8      No Extending of Credit.   Neither  you  nor  any  guarantor is
                  ----------------------
engaged or will generally engage in the business of purchasing or selling Margin
Stock (as defined in Regulation G, T, U or X of the Board of Governors or of the
Federal Reserve System)  extending  credit for the purpose of purchasing  Margin
Stock.

         3.9      No Subsidiaries.   Except  as disclosed  on Exhibit "D" to the
                  ---------------
Credit  Agreement,  you have no  subsidiaries  and do not  control,  directly or
indirectly, any other business entity.

         3.10     Patents, Trademarks, etc.   You  own  or have the right to use
                  ------------------------
all of the patents, trademarks, permits, service marks, trade names, copyrights,
licenses and  franchises or rights with respect to the  foregoing  (collectively
"patents"),   necessary   for  the  conduct  of  your   business  as   presently
contemplated, without any known conflict with the rights of others.

         3.11     Information, Reports, etc.  All information, reports and other
                  -------------------------
papers and data  furnished  to  Motorola by you on or at any time after the date
hereof  are or will be,  at the time the  same are so  furnished,  complete  and
correct in all material respects;  and all projections  concerning your business
furnished by you, as  supplemented,  will be prepared or presented in good faith
by you and have a reasonable basis. No fact is known to you which materially and
adversely  affects or in the future may (so far as you can  reasonably  foresee)
materially  and adversely  affect the business,  operations,  assets (taken as a
whole) or your financial condition which has not been set forth in the Financial
Statements or in such information, reports, papers and data.

         3.12 Security Documents.  The provisions of the Agreement are effective
              ------------------ 
to create in favor of Motorola a legal, valid and enforceable  security interest
in all your  right,  title and  interest in the  Collateral  in which a security
interest may be created under Article 9 of the Uniform Commercial Code; and when
(i)  financing  statements  have been filed in the offices in the  jurisdictions
listed in Exhibit "E" to the  Agreement,  and (ii) except for any further filing
or taking of possession  which may be required under Section 9-306 of the UCC in
order to perfect a security  interest  in  proceeds  of the  Collateral  and any
taking of possession  which may be required  under the UCC in order to perfect a
security  interest in  instruments,  the Agreement will create and grant a fully
perfected  first Lien on, and  security  interest in the  Collateral  (including
proceeds) in which a security  interest may be perfected  under Article 9 of the
UCC.

         3.13 Governmental Regulation.  You hold sufficient FCC licenses for the
              -----------------------
conduct  of your  business  in each area in which  you  currently  conduct  your
business.


         3.14 Assumed Names.  You are not doing business under any fictitious or
              -------------
 assumed names, except as disclosed in Exhibit "F" to the Agreement.

         3.15 Principal Place of Business.   Your  chief  executive  office  and
              ---------------------------
principal place of business are located at the notice address shown next to your
signature block on the Credit Agreement.  Your books and records with respect to
the Collateral are kept at this address.

         3.16 Environmental and Safety Matters.   You  are  in compliance in all
              --------------------------------
material respects with all federal, state, local and other statutes, ordinances,
orders,  judgments,   rulings  and  regulations  relating  to  the  environment,
environmental  regulation  or  control,  employee  health  and  safety,  or  the
generation,  use,  storage,  disposal or  transportation  of toxic or  hazardous
materials, substances or wastes (collectively, "Environmental Laws").

                            4. Affirmative Covenants

         You hereby agree that,  so long as the Credit  remains in effect or any
amounts remain  outstanding and unpaid or any other amount is owing to Motorola,
you shall do the following.

         4.1      Financial Reporting.
                  -------------------

                  4.1.1. As soon available, but not later than 90 days after the
end of each fiscal  year,  commencing  with the fiscal year ending  December 31,
1998, you shall provide Motorola with a copy of the audited consolidated balance
sheets of the  Borrower  and the  Guarantors  as at the end of such year and the
related audited consolidated statements of income, stockholders' equity and cash
flows for such fiscal year,  setting forth in each case in comparative  form the
figures for the previous year, and accompanied by the opinion of Arthur Andersen
LLP or another nationally  recognized  independent public accounting firm, which
report shall state that such consolidated  financial  statements present fairly,
in all material respects, the financial position, results of operations and cash
flows for the  periods  indicated  in  conformity  with GAAP  applied on a basis
consistent with prior year.

                  4.1.2 As soon as  available,  but not later than 45 days after
the end of each of the first three fiscal quarters of each year, commencing with
the fiscal quarter ending on June 30, 1998, a copy of the unaudited consolidated
balance  sheets of the Borrower and the Guarantors as of the end of such quarter
and the related consolidated statements of income, stockholders' equity and cash
flows for the period  commencing  on the first day and ending on the last day of
such quarter,  and  certified by an  appropriate  Responsible  Officer as fairly
presenting,  in all material  respects,  in accordance with GAAP (except for the
absence of  footnote  disclosure),  the  financial  position  and the results of
operations of the Borrower and the Guarantors.

                  4.1.3. As soon available, but not later than 90 days after the
end of each fiscal  year,  commencing  with the fiscal year ending  December 31,
1998, you shall provide  Motorola with a copy of the unaudited  balance sheet of
the Borrower as at the end of such year and the related unaudited  statements of
income, owners equity and cash flows for such fiscal year, setting forth in each
case in comparative  form the figures for the previous year, and certified by an
appropriate Responsible Officer as fairly presenting,  in all material respects,
in accordance with GAAP, the financial position and the results of operations of
the Borrower..

                  4.1.4 As soon as  available,  but not later than 45 days after
the end of each of the first three fiscal quarters of each year, commencing with
the fiscal  quarter  ending on June 30,  1998, a copy of the  unaudited  balance
sheet of the Borrower as of the end of such  quarter and the related  statements
of income,  owners equity and cash flows for the period  commencing on the first
day and ending on the last day of such quarter,  and certified by an appropriate
Responsible  Officer  as  fairly  presenting,   in  all  material  respects,  in
accordance  with GAAP  (except  for the  absence of  footnote  disclosure),  the
financial position and the results of operations of the Borrower.

         4.2      Certificates: Other Information.
                  -------------------------------

                  4.2.1  Concurrently with the delivery of the items referred to
in Sections 4.1.1,  and 4.1.2 above,  you will deliver to Motorola a certificate
of the  independent  certified  public  accountants or of a Responsible  Officer
certifying  such  financial  statements or other items,  as the case may be, and
stating  that no Default or Event of Default  has  occurred  and is  continuing,
except as specified in such certificate.

Within  five (5) days  after the same are sent or  filed,  you will  deliver  to
Motorola (a) copies of all reports sent to the  stockholders  of American Mobile
Satellite  Corporation  covering such matters as are typically covered in annual
or quarterly  reports,  and (b) copies of each report on Form 8-K filed with the
Securities and Exchange Commission.

                  4.2.3 You shall  further  deliver  promptly to  Motorola  such
additional  financial and other  information as Motorola may reasonably  request
from time to time.

         4.3 Discharge Obligations. You will pay, discharge or otherwise satisfy
             ---------------------
in the  ordinary  course of  business  (a) all  Indebtedness,  and (b) all other
obligations to the extent such obligations exceed, in the aggregate, $1,000,000,
except,  in any such case,  to the extent that (i) the amount or validity of any
such Indebtedness or other obligation is currently being contested in good faith
by appropriate  proceedings,  (ii) appropriate  reserves in conformity with GAAP
have been  provided  on your  books,  and (iii) such matter does not involve any
risk of loss, forfeiture, or Lien on your assets.

         4.4  Continuation  of  Business;  Compliance.  You will (a) continue to
              ---------------------------------------
engage  in  business  of the same  general  type as now  conducted  by you,  (b)
preserve  and  maintain  in full force and effect  your  existence  as a general
partnership and your good standing under the laws of your State of organization,
(c)  preserve  and  maintain  in full force and effect  all  rights,  privileges
qualifications,  permits,  licenses and franchises necessary or desirable in the
normal  conduct  of your  business,  (d) use  your  reasonable  efforts,  in the
ordinary  course and consistent  with past  practice,  to preserve your business
organization and preserve the goodwill and business of the customers,  suppliers
and others having business  relations with you, and (e) preserve or renew all of
your registered trademarks,  trade names and service marks, the non-preservation
of which  could have a material  adverse  effect on your  business,  operations,
financial  condition,  or your  ability to perform  your  obligations  under the
Agreement.

         4.5    Maintenance of Collateral.  You will keep the Collateral in good
                -------------------------
 working order and condition, reasonable wear and tear excepted.

         4.6   Insurance.   You will  maintain  property insurance in amounts at
               ---------
least equal to the value of the Collateral with financially  sound and reputable
insurance companies. The policies shall be in writing and shall name Motorola as
loss payee, but only to the extent of the balance  outstanding from time to time
under the Agreement.  You will furnish to Motorola, prior to the initial funding
under the Agreement and thereafter upon written request,  full information as to
the insurance  carried.  In the event of loss  involving any of the  Collateral,
insurance  proceeds will be used to repair (if you and Motorola agree in writing
that  repairing  the damage is  feasible)  the damaged  Collateral.  If Motorola
determines in good faith that the Collateral cannot be timely repaired, then all
such insurance  proceeds shall be paid directly to Motorola,  for application to
the amounts outstanding hereunder,  unless Motorola agrees to accept replacement
Collateral.

         4.7  Records; Access.  You will keep proper books of record and account
              ---------------
in which  full,  true,  and  correct  entries  in  conformity  with GAAP and all
Requirements  of Law shall be made to reflect truly the  financial  position and
the  results  of your  operations.  Upon  reasonable  notice,  you  will  permit
representatives  of Motorola to visit and inspect the Collateral and any of your
properties  and examine and make  extracts  from and copies of any of your books
and records at any  reasonable  time  during  normal  business  hours and as may
reasonably  be desired by Motorola,  and to discuss your  business,  operations,
properties and financial and other condition.

         4.8  Notices.  You  will, within the time periods set forth below, give
              -------
written notice to Motorola of the occurrence of any of the following:

                  4.8.1 within five (5) Business Days of the occurrence thereof,
any Default or Event of Default;

                  4.8.2 within five (5) Business Days of the occurrence thereof,
any (i) material  default or any material event of default under any contractual
obligation of yours which is material in relation to your business,  operations,
assets  (taken in the  aggregate)  or  financial  condition  or (ii) any  claim,
litigation,  investigation, or proceeding which arises at any time involving you
which is  reasonably  anticipated  to be  adversely  determined  and  which,  if
adversely  determined,  would have a material  adverse  affect on your business,
operations, assets (taken in the aggregate) or financial condition;

                  4.8.3 within five (5) Business Days of the occurrence thereof,
any material adverse change in your business,  operations,  assets (taken in the
aggregate) or financial condition;

                  4.8.4 not less  than  thirty  days  prior  to  the  occurrence
thereof,  the  movement of any portion of the  Collateral,  which  notice  shall
identify  the  jurisdiction  (as to State and  county)  into  which each item of
Collateral (identified by serial number) shall be moved;

                  4.8.5  not less than  thirty  days  prior  to  the  occurrence
thereof,  the relocation of your principal  place of business or chief executive
offices to any location; and

                  4.8.6  not less  than  thirty  days  prior  to  the occurrence
thereof,  the  change of your name or  corporate  structure,  or your use of any
fictitious name or assumed name.


Each notice pursuant to Sections 4.8.1, 4.8.2, and 4.8.3 shall be accompanied by
a statement of a Responsible  Officer  setting  forth details of the  occurrence
referred  to therein and  stating  what action you propose to take with  respect
thereto.  Prior to the occurrence of any event  specified in to Sections  4.8.4,
4.8.5,  or 4.8.6 you shall also  execute and deliver to Motorola  any  documents
requested  by Motorola to maintain  the  continuous  perfection  and priority of
Motorola's Liens and security interests.


                              5. Negative Covenants

         You hereby agree that, so long as the Credit  remains  outstanding  and
unpaid or any other amount is owing by you to Motorola, you will comply with the
following unless Motorola has consented in writing to your failure to so comply:


         5.1      Liens.  You will not create, incur, assume or suffer to exist,
                  -----
any Lien upon any of your property, assets, income or profits, whether now owned
or hereafter acquired except:


                  5.1.2 existing  Liens,  as  have  been disclosed in writing to
Motorola prior to the date hereof;

                  5.1.2 Liens for taxes not yet due or which are being contested
in good faith and by  appropriate  proceedings  if (a)  adequate  reserves  with
respect  thereto are  maintained on your books in accordance  with GAAP (b) such
matter does not involve a risk of forfeiture;

                  5.1.3 carriers',  warehousemen's,  mechanics',  materialmen's,
repairmen's,  or other like Liens  arising in the  ordinary  course of  business
which are not  overdue  for a period of more than  thirty (30) days or which (a)
are being contested in good faith and by appropriate proceedings,  (b) have been
appropriately  reserved against,  and (c) carry no risk of forfeiture or loss of
legal rights;

                  5.1.4  pledges  or  deposits  in  connection   with  workmen's
compensation,  unemployment insurance, and other social security legislation, in
the ordinary course of your business;

                  5.1.5  deposits  to  secure  the  performance  of  bids, trade
contracts  (other than for  Indebtedness),  leases (other than capital  leases),
statutory  obligations,  surety and appeal  bonds,  performance  bonds and other
obligations of a like nature incurred in the ordinary course of business;

                  5.1.6 easements, rights-of-way, restrictions and other similar
encumbrances  incurred  in  the  ordinary  course  of  business  which,  in  the
aggregate,  are  not  substantial  in  amount,  and  which  do not  in any  case
materially  detract from the value of the property  subject thereto or interfere
with the ordinary conduct of your business;

                  5.1.7  Liens in favor of Motorola under the Agreement;

                  5.1.8 Liens on real or personal  property  given to secure the
purchase  price  thereof,  for  property  acquired  in the  ordinary  course  of
business; and

                  5.1.9 other Liens  which do  not attach to the Collateral, not
exceeding $15,000,000 in the aggregate at any time.

         5.2  Change  of  Status.   You  will  not  enter  into  any  merger  or
              ------------------
consolidation  or  amalgamation,  will not  liquidate,  wind up or dissolve  (or
suffer any  liquidation  or  dissolution),  and shall not convey,  sell,  lease,
assign,  transfer  or  otherwise  dispose of any of your  property,  business or
assets  (including,  without  limitation,  receivables and leasehold  interests)
whether now owned or hereafter acquired (except the sale or other disposition of
assets for good  consideration  in the ordinary  course of business) if any such
transaction   might  materially   adversely  affect  your  business,   financial
condition, or your ability to perform your obligations under the Agreement.

         5.3   Organization  and  Governing  Documents.   You  will  not  amend,
               ---------------------------------------
supplement or otherwise  modify or waive  compliance  with any provision of your
articles of  incorporation  or by-laws if you are a corporation,  or partnership
agreement,  if a partnership,  if such  amendment,  supplement,  modification or
waiver would have a material adverse effect on your business,  operation, assets
(taken in the aggregate) or financial  condition,  or would otherwise materially
and  adversely  affect  your  ability  to  perform  your  obligations  under the
Agreement.

         5.4      FCC License.  Except  for  the performance of agreements which
                  -----------
predate the  Agreement,  you will not  transfer or attempt to transfer  your FCC
licenses to operate any system to any Person other than in the  ordinary  course
of business.

         5.5      Transactions with Affiliates.   You  will  not  use any of the
                  ----------------------------
proceeds hereunder, or engage in the purchase of goods and services, directly or
indirectly, with any Affiliate on any basis other than arms'-length.

         5.6      Subsidiaries.   You  will  not  form,  create,  or acquire any
                  ------------
 subsidiaries except those identified on Exhibit "D" to the Agreement.

         5.7      Collateral.  You  will  not at any time place or locate any of
                  ----------
the Collateral,  or cause or permit any of the Collateral to be located,  at any
place other than a Filing Jurisdiction.

<PAGE>



                         6. Events of Default; Remedies

         6.1      Events of Default.  Any  of  the  following  events  shall  be
                  -----------------
considered  an Event of  Default,  upon the  occurrence  of which  Motorola  may
exercise  all  remedies  available  at law  together  with all other  rights and
remedies provided under the terms of this Section VI:

                  6.1.1  You  shall fail  to pay any principal or interest under
the Note  within  five (5) days of the due date,  or shall fail to pay any other
amount  payable under the Agreement  within ten (10) days after  Motorola  gives
notice to you of such failure.

                  6.1.2  A  representation  or  warranty  made  by  you  in  the
Agreement,  or which is contained in any  certificate,  document or financial or
other statements furnished at any time under or in connection  therewith,  shall
prove to have been incorrect in any material  respect on or as of the date made;
provided  that if such default is capable of being cured,  you shall have thirty
days after notice of such default to remedy the default.

                  6.1.3 You shall default in the  performance  of any obligation
pursuant to Section 4.8 or Section 5.7 hereof.

                  6.1.4 You shall default in the  observance or  performance  of
any other  covenant or  obligation  contained  in this  Agreement or any exhibit
hereto,  and such default shall continue  unremedied for a period of thirty days
after Motorola giving notice to you of such default.

                  6.1.5  You shall (a) default  in  any payment of the principal
of or the interest on any item of Indebtedness  covered by subsection (i) of the
definition of  "Indebtedness"  beyond the grace period,  if any, provided in the
instrument  or  agreement  under which such  Indebtedness  was  created;  or (b)
default in the  observance or  performance  of any other  agreement or condition
relating to any such  Indebtedness  or contained in any  instrument or agreement
evidencing, securing or relating thereto.

                  6.1.6  The occurrence of any of the following:

                           (i)   you  shall  commence  any  case, proceeding  or
other action under any existing or future law of any  jurisdiction,  domestic or
foreign,  relating  to  bankruptcy,  insolvency,  reorganization  or  relief  of
debtors,   (a)  seeking  to  have  an  order  for  relief  entered,  or  seeking
reorganization,  arrangement, adjustment, winding-up, liquidation,  dissolution,
composition  or other relief with  respect to you or your debts,  or (b) seeking
appointment of a receiver,  trustee,  custodian or othe similar official for you
or for all or any substantial  part of your assets;  or you shall make a general
assignment for the benefit of your creditors;

                           (ii)  there  shall be commenced against you any case,
proceeding or other action of a nature referred to in clause (i) above which (a)
results  in the  entry of an  order  for  relief  or any  such  adjudication  or
appointment and (b) remains  undismissed,  undischarged or unbonded for a period
of thirty days;

                           (iii) there shall be commenced  against you any case,
proceeding  or  other  action  seeking  issuance  of a  warrant  of  attachment,
execution,  distraint or similar process against all or any substantial  part of
your  assets,  which  results in the entry of an order for any such relief which
shall not have been vacated,  discharged,  or stayed or bonded  pending  appeal,
within thirty days from the entry thereof;

                           (iv)  you shall take any action in furtherance of, or
indicating your consent to, approval of, or acquiescence in, any of the acts set
forth in clause (i), (ii), or (iii) above;

                           (v)   you  shall generally not pay your debts as they
become due or shall be unable to pay such debts,  or shall admit in writing your
inability to pay such debts; or

                           (vi) the  occurrence of any of the  foregoing  events
with respect to any Guarantor of your obligations to Motorola.

                  6.1.7  One  or  more  judgments  or  decrees  shall be entered
against you involving in the aggregate a liability (not paid or fully covered by
insurance) of $50,000.00  or more,  and all such  judgments or decrees shall not
have been vacated,  discharged, or stayed or bonded pending appeal within thirty
days from the entry thereof.

                  6.1.8 Any license  materially  necessary  for your  continuing
operation  of  your  business  or  any  other  material   authorization  of  any
Governmental  Authority  with respect to the conduct by you of your business and
operations,  or with respect to the Agreement,  (i) shall not be obtained as and
when  required to permit you to conduct your  business as then being  conducted,
and which has a  material  adverse  effect on your  financial  condition  or and
adverse effect on your ability perform your obligations under the Agreement;  or
(ii) shall  cease to be in full force and effect.  A license  shall be deemed to
cease to be in full force and effect (a) when an order  revoking or  terminating
said  license  shall be issued  and such  order is no longer  subject to further
administrative and judicial review, or (b) when any Government  Authority having
jurisdiction  over any such license  shall,  prior to the  termination  thereof,
decide  not to renew  such  license  and such  decision  shall not be subject to
further administrative or judicial review.

                  6.1.9  There  shall  occur  a  default   under  any  Guarantee
Agreement executed in connection with the Credit Agreement.

                  6.1.10  You  shall  fail  to  pay any undisputed amount due to
Motorola on open account within thirty (30) days from an invoice  therefor,  and
such failure shall continue for ten (10) days after notice thereof by Motorola.

         6.2  Remedies.
              --------
 
                  6.2.1  Acceleration.   Upon  the  occurrence  and  during  the
                         ------------
continuance  of any Event of  Default,  in  addition  to all rights of a secured
creditor  under  Article 9 of the UCC,  (a) if such event is an Event of Default
specified in clause (i) or (ii) of Section 6.1.5 above, all amounts owing by you
under this  Agreement and under any other account  relationship  between you and
Motorola shall immediately become due and payable,  and (b) if such event is any
other Event of Default,  then Motorola may, by notice to you declare all amounts
owing by you under this  Agreement or under any such other account  relationship
to be due and  payable,  whereupon  the same  shall  immediately  become due and
payable.

                  6.2.2  Possession  of  Collateral.  You agree,  if an Event of
                         --------------------------
Default  shall be existing and upon  Motorola's  request,  to assemble,  at your
expense, all equipment and other property  constituting a part of the Collateral
at a convenient place acceptable to Motorola and to pay all costs of Motorola of
collection  of  all  amounts  due,  and  enforcement  of all  rights  hereunder,
including  reasonable  attorney's fees and legal  expenses,  and expenses of any
repairs to any realty on other  property to which any of such  equipment  may be
affixed.  Upon an Event of Default Motorola may, to the fullest extent permitted
by applicable law, without notice,  advertisement,  hearing or process of law of
any kind, enter upon any premises where any of the equipment  constituting  part
of the  Collateral  may be  located  and  take  possession  of and  remove  such
equipment.

                  6.2.3 Sale of Collateral.  Without  limiting the generality of
                        ------------------ 
the  foregoing,  Motorola  shall have all the rights and  remedies  of a secured
party under the UCC or other  applicable  law and  Motorola may sell and deliver
any or all  Collateral  held by or for it at public or private  sale,  for cash,
upon  credit,  for future  delivery or  otherwise,  at such prices and upon such
terms as Motorola deems  advisable,  in its sole discretion  and/or collect,  or
enforce the  collection of, the  Collateral.  Motorola may buy any or all of the
Collateral at any such sale.

                  6.2.4  Standard of Care.   Motorola  shall exercise reasonable
                         ----------------
care at all times in the custody and  preservation  of any of the  Collateral in
its possession, and shall be deemed to have exercised such reasonable care if it
takes such action for the purpose you reasonably request in writing.

                  6.2.5  Advances  to  Protect Collateral.   Motorola  may  (but
                         --------------------------------
shall not be obligated to) make  advances to preserve,  protect or obtain any of
the Collateral, including advances to pay taxes, insurance and the like, and all
such advances shall become a part of the Obligations owing to Motorola hereunder
and shall be repayable to Motorola with  interest  thereon from the date of such
advance until paid at the Default Rate set forth in this Agreement.

                  6.2.6  Notices, etc. Waived.   Except as expressly provided in
                         --------------------
this  Section VI, you  expressly  waive,  to the  fullest  extent  permitted  by
applicable law, presentment,  demand,  protest, any and all notices of any kind,
advertisement,  hearing or process of law in  connection  with the  exercise  by
Motorola of any of its rights and remedies  upon the  occurrence  of an Event of
Default. If any notification of intended disposition of any of the Collateral is
required by law, such  notification,  if mailed,  shall be deemed reasonably and
properly  given if mailed at least five days  before such  disposition,  postage
prepaid,  addressed to Company  either at the address  shown  below,  or at your
address appearing on the records of Motorola.

                  6.2.7  Setoff.  If any amount  owing by you to Motorola  shall
                         ------
have become due and payable (by acceleration or otherwise),  Motorola shall have
the right, in addition to all other rights and remedies available to it, without
notice to you, to setoff  against such  amounts any debt owing from  Motorola to
you and any other  funds held by  Motorola  in any manner for your  account,  it
being  understood  that the  Escrowed  Funds will in no event be  available  for
setoff  under this  provision.  Such right shall exist  whether or not  Motorola
shall have given notice or made any demand  hereunder,  whether or not such debt
owing to you is  matured  or  unmatured,  and  regardless  of the  existence  or
adequacy  of any  collateral,  guaranty or any other  security,  right or remedy
available  to  Motorola.  You  hereby  consent  to  and  confirm  the  foregoing
arrangements and confirm Motorola's rights of setoff.

                  6.2.8 Application of Proceeds.   Any  proceeds  of  any of the
                        -----------------------
Collateral  shall be applied by Motorola  toward the repayment of the Credit and
any of your other  obligations  to Motorola in the  following  priority:  first,
towards expenses  incurred in connection with the exercise of rights or remedies
with  respect  to any of the  Collateral  (including  reasonable  fees and legal
expenses);  second,  to accrued  interest;  and third,  to the  installments  of
principal in inverse order of maturity thereof

                  6.2.9 No Further Advances.  During the continuance of an Event
                        -------------------
of Default, Motorola shall have no obligation to make Advances to you.

         6.3 General  Authority.  Subject to any  requirements  for governmental
             ------------------ 
approval,  upon the  occurrence  and  during  the  continuance  of any  Event of
Default,  the rights,  powers and  privileges  provided in this  Section and all
other  remedies  available to Motorola  under this Agreement or by statute or by
rule of law may be  exercised  by Motorola at any time from time to time whether
or not the Credit  shall be due and payable,  and whether or not Motorola  shall
have instituted any foreclosure or other action for enforcement. For the purpose
of carrying out the provisions and exercising the rights,  powers and privileges
granted  by this  Section  6, you  hereby  irrevocably  constitute  and  appoint
Motorola  your true and lawful  attorney-in-fact  to  execute,  acknowledge  and
deliver any  instruments  and do and perform any acts such as are referred to in
this Section 6 in your name on your behalf in accordance with this Agreement and
any statute or rule of law.  This power of attorney is a power  coupled  with an
interest and cannot be revoked.

         6.4 Expenses.  In addition to all other sums due to Motorola,  you will
             --------
pay Motorola, on demand, all reasonable costs and expenses (including reasonable
attorneys' fees and  disbursements  and court costs) incurred by Motorola at any
time  in  connection  with  (i)  the  enforcement  or  collection  of any of the
Obligations, (ii) attempts to obtain possession of, liquidate, or collect on any
of the Collateral,  (iii) the enforcement,  protection or preservation of any of
Motorola's  rights or remedies  under this  Agreement,  or (iv) the  completion,
construction,  installation, operation, management or maintenance of any of your
systems by Motorola, its designee, or a receiver or trustee, whether pursuant to
this Section 6 or otherwise,  or (v) the prosecution of any action or proceeding
brought  against you or any of the Guarantors  concerning any matter arising out
of or  connected  with  this  Agreement  or any  Collateral,  including  without
limitation any actions  arising in, arising under or related to a case under the
Bankruptcy  Reform Act of 1978, as amended,  or any successor statute or similar
state law. All such amounts shall be payable on demand and shall accrue interest
at the Default Rate from the time of demand until paid in full. All such amounts
shall be part of the  obligations  due under the Agreement  and payment  thereof
shall be secured by all the Collateral.

                             7. Security Provisions

Your Obligations in connection with the Credit and this Agreement are secured by
the Collateral.  These Obligations  include,  but are not limited to, principal,
interest,  premium,  charges,  attorneys'  fees,  assessments,  costs and future
Advances,  whether  direct or  indirect,  contingent  or  absolute,  matured  or
unmatured.  You hereby grant to Motorola a continuing  security  interest in and
lien on the Collateral.

                  7.1      Priority of Security Interest.  The security interest
                           -----------------------------
and lien granted by Borrower to Motorola  pursuant to the Agreement is and shall
be a perfected,  first priority continuing and indefeasible security interest in
the Collateral subject only to any Liens authorized by Motorola in writing.

                          8. Requirements for Advances

         In order to draw down an Advance under the Credit  Agreement,  you must
have satisfied each of the following conditions precedent:

         8.1  No  Default  or  Event  of  Default  shall  have  occurred  and be
continuing.

         8.2  You   will  have   supplied   Motorola   with   such  articles  of
incorporation, partnership agreements, by-laws, certificates of good standing or
qualification to do business,  opinions of counsel,  environmental certificates,
FCC licenses or compliance  information,  resolution,  incumbency  certificates,
insurance  documents,  and other "due  diligence"  information  as Motorola  may
reasonably request.

         8.3  All financing statements, deliveries (including without limitation
share  certificates),  and other  actions  reasonably  necessary  to assure  the
enforceability  of this  Agreement and the  perfection  of  Motorola's  security
interests in the Collateral and in the Equity Interests shall have been taken.

         8.4  All proceedings,  documents, and other legal matters pertaining to
this  Agreement  and the  transactions  contemplated  herein shall be reasonably
satisfactory in form and substance to Motorola and to Motorola's counsel.

         8.5  The  requested  Advance, when  added  to  the  existing  principal
balance  outstanding,  must not exceed the maximum amount of Credit set forth in
the Credit Agreement. Amounts repaid may not be re-borrowed.

                                 9. Other Terms

         9.1      Amendments.  No amendment,  supplement or modification of this
                  ----------
Agreement shall be binding on any party hereto unless made in writing and signed
by a duly authorized representative of such party.

         9.2  Notices.  All  notices,  requests  and  demands  to  or  upon  the
              -------
respective  parties  hereto to be  effective  shall be in  writing  and,  unless
otherwise expressly provided herein,  shall be deemed to have been duly given or
made (i) when delivered by hand or (ii) the following  Business Day when sent by
overnight delivery service,  by courier,  or (iii) the same day when transmitted
by facsimile and a confirmation  of transmission  printed by sender's  facsimile
machine.  A copy of any notice given by facsimile also shall be mailed,  postage
prepaid,  to the addressee.  Notices to the  respective  parties hereto shall be
addressed to the parties at their addresses shown on the Credit Agreement.

         9.3      Waiver.
                  ------

                  9.3.1  Waiver by Consent.  Motorola may execute and deliver to
                         -----------------
you  from  time to  time,  a  written  instrument  waiving,  on such  terms  and
conditions as Motorola may specify in such  instrument,  any of the requirements
of the Agreement or any Default or Event of Default and its consequences. In the
case of any waiver, you and Motorola shall be restored to their former positions
and rights  hereunder and any Default or Event of Default waived shall be deemed
to be  cured  and  not  continuing;  but no  such  waiver  shall  extend  to any
subsequent or other Default or Event of Default, or impairment thereof.

                  9.3.2 No Implied Waiver: Rights are Cumulative. The failure to
                        ----------------------------------------
exercise or the delay in exercising, on the part of Motorola, any right, remedy,
power or privilege  under the Agreement,  shall not operate as a waiver thereof;
the single or partial  exercise of any right,  remedy,  power or privilege under
the Agreement  shall not preclude any other or further  exercise  thereof or the
exercise of any other right, remedy, power or privilege.  The rights,  remedies,
powers and  privileges  herein  provided are cumulative and not exclusive of any
rights, remedies, powers and privileges provided by law.

         9.4 Survival.  All  agreements,  covenants, representations, warranties
             --------
and  indemnities  made under the Agreement and in any document,  certificate  or
statement delivered pursuant thereto or in connection herewith shall survive the
execution and delivery of this Agreement and the Note and the making of Advances
regardless of any investigation made by Motorola.

         9.5  Indemnity.  You hereby  indemnify  Motorola  against  any  losses,
              ---------
claims,  penalties,   expenses,   actions,  suits,   obligations,   liabilities,
documentary stamp or transfer taxes (if applicable) and liens (and all costs and
expenses,   including   reasonable   attorney's   fees  incurred  in  connection
therewith),  which Motorola has sustained or incurred or may sustain or incur in
connection with any of the Collateral,  or the enforcement of the Agreement,  or
as a consequence  of any default by you in the  performance or observance of any
covenant or condition contained in this Agreement, including without limitation,
the breach of any representation or warranty, any failure by you to pay when due
(by acceleration or otherwise) any principal,  interest, fee or any other amount
due hereunder, and any failure to comply with all applicable Requirements of Law
(collectively, "Claims"), except for any Claims determined by a court in a final
order  to have  been  caused  by  Motorola's  gross  negligence  or  intentional
misconduct.  Your  obligations  under  this  Section  9.5  shall  be part of the
obligations  secured  hereby and shall be secured by the  Collateral.  You agree
that upon written  notice by Motorola of the assertion of any Claims,  you will,
at  Motorola's  option,  either  assume full  responsibility  for, or  reimburse
Motorola for the reasonable costs and expenses of, the defense  thereof,  except
for any Claims caused by Motorola's gross negligence or intentional  misconduct.
The provisions of this Section 9.5 shall survive the term of this Agreement.

         9.6      Assignment.  This Agreement shall be binding upon and inure to
                  ----------
the benefit of you,  Motorola,  and their  respective  permitted  successors and
assigns.  This  Agreement is not  assumable by any  successor or  transferee  of
yours;  you may not assign or transfer any of your rights under this  Agreement,
or delegate  any of your duties  under this  Agreement,  without  prior  written
consent of Motorola.  Motorola may assign this Agreement,  without notice to you
or your consent;  provided that so long as no Event of Default exists,  Motorola
shall not assign this Agreement to any entity that competes with you.

9.7   Counterpart   Documents.   This   Agreement   may  be   executed   by  one
- ---------------------  or more of the parties to this Agreement in any number of
separate  counterparts  and all of said  counterparts  taken  together  shall be
deemed to constitute one and the same instrument.

         9.8      FCC/PUC Approvals.   The  exercise  of any rights hereunder by
                  -----------------
Motorola which may require  FCC/PUC  approval shall be subject to obtaining such
approval.  Pending obtaining any such FCC/PUC approval, you will not do anything
with respect to such rights which is contrary to the interests of Motorola.

         9.9      Severability.  If any  provision of this Agreement is found to
                  ------------
be unenforceable for any reason whatsoever,  such provision shall be deemed null
and void to the extent of such  unenforceability  but shall be deemed  separable
from and shall not invalidate any other provision of this Agreement.

         9.10     Captions. Captions to the various paragraphs of this Agreement
                  --------
are  provided  for  convenience  only  and  shall  not be used to  construe  the
provisions of this Agreement.

         9.11     Review of Information.  You  acknowledge  and  agree  that any
                  ---------------------
review or analysis by Motorola of financial information,  operating information,
marketing  data or other  information  provided  to  Motorola  by you or on your
behalf at any time is and shall be conducted  solely for Motorola's  benefit and
internal  use and  that  Motorola  is under  no duty or  obligation  to make the
results of such review or analysis  available to you.  You are not relying,  and
will not rely, on Motorola for financial or business advice.

         9.12     No Joint Venture; No Benefit to Non-Parties.  Nothing  in this
                  -------------------------------------------
Agreement shall be deemed to constitute any kind of  partnership,  joint venture
or fiduciary relationship between or among Motorola and any Obligor(s); further,
the  Agreement  is not intended to benefit any Person that is not a party to the
Agreement.

<PAGE>




                                   EXHIBIT B




Amount: $10,000,000                                          Date: June 17, 1998


                                 PROMISSORY NOTE


         FOR VALUE RECEIVED,  the  undersigned  (the "Borrower" or "you") hereby
promises  to  pay  to  the  order  of  Motorola  Inc.  ("Motorola")  a  Delaware
corporation,  at its principal offices at 1303 East Algonquin Road,  Schaumburg,
Illinois  60196,  the lesser of (i) the  principal  sum of Ten  Million  Dollars
($10,000,000), or (ii) the aggregate unpaid principal amount of Advances made by
Motorola to the Borrower  under the Credit  Agreement  (the "Credit  Agreement")
dated as of June 17, 1998  between the  Borrower  and  Motorola,  together  with
interest  on  the  entire  principal  balance  from  time  to  time  outstanding
hereunder.

         Interest  shall  accrue  as of the  date  of this  Note  and  shall  be
calculated on the amount of each Advance outstanding from time to time at a rate
per annum  equivalent to the Applicable  Interest Rate (as defined in the Credit
Agreement).  Interest shall be payable quarterly in arrears.  The first interest
payment shall be due on the first day of the calendar  quarter  first  following
the date hereof on which any amounts are outstanding hereunder,  and on the date
of prepayment in full of any balance due hereunder. Interest shall be calculated
on a 365/366 day year basis for actual days elapsed.  Upon the  occurrence of an
Event of  Default,  the  interest  rate shall be  increased  by a further  three
percent (3%) per annum above the rate  otherwise  applicable  or (if lesser) the
maximum  rate  permitted  by law.  In no event  shall the holder of this Note be
entitled to claim any sum or rate of  interest in excess of the maximum  allowed
by law. Any payment in excess of such  maximum sum or amount of interest  shall,
at the option of Motorola,  be applied to reduce outstanding  principal or shall
be refunded to Borrower.

         Motorola  shall  record  on  its  books  or  records  all  payments and
prepayments of principal and interest,  the principal  balance from time to time
outstanding  and the respective  dates and maturity  dates  thereof.  The record
thereof,  whether shown on such books or records,  shall be prima facie evidence
as to all amounts owing under this Note; provided,  however, that the failure of
Motorola to record any of the foregoing or any error in such notation  shall not
limit or otherwise affect the obligation the Borrower to repay the entire Credit
under the Credit Agreement together with accrued interest thereon.

         Principal  shall be  payable  in  accordance  with the  terms of Credit
Agreement.

         This Note is the Promissory Note referred to in, and issued under,  the
Credit  Agreement,  and Motorola is entitled to all of the benefits provided for
therein; reference is hereby made to the Credit Agreement for a statement of all
such benefits. Capitalized terms not defined in this



<PAGE>


Note shall have the meanings assigned to such terms  in the Credit Agreement and
the exhibits attached thereto.  Without limiting that reference,  Motorola shall
be entitled  to recover its  attorney's  fees and costs in  connection  with any
actions or proceedings  taken to collect this Note after any Event of Default as
detailed in the Credit Agreement.

         This Note shall be  subject to, governed and construed according to the
laws of the State of Illinois,  without regard to its provisions on the conflict
of laws. Whether or not executed in another jurisdiction, this Note shall become
effective upon delivery to Motorola at its headquarters in Illinois.

         The  maker  hereby  waives  notice, protest, presentment, and notice of
dishonor  to  the  full  extent   permitted  by  law.  This  Note  evidences  an
indebtedness incurred in connection with a commercial  transaction rather than a
consumer or household debt.

         YOU AND MOTOROLA AGREE THAT ANY CLAIM, COUNTERCLAIM, SETOFF, OR DEFENSE
RELATING IN ANY WAY TO THIS NOTE, OR TO THE MATTERS AND TRANSACTIONS GIVING RISE
TO THE ADVANCES  AND  INDEBTEDNESS  EVIDENCED  BY THIS NOTE,  SHALL BE HEARD AND
DETERMINED BY A COURT WITHOUT A JURY.




                                      ARDIS COMPANY


                                      By:
                                         ---------------------------------------
                                         Walter V. Purnell

                                      Title: 
                                            ------------------------------------











<PAGE>








                                    EXHIBIT C

               LIST OF GUARANTORS AND FORM OF GUARANTEE AGREEMENT

                                   Guarantors

                      American Mobile Satellite Corporation
                            AMSC Acquisition Company
                           AMSC Subsidiary Corporation




<PAGE>

                                     FORM OF
                               GUARANTEE AGREEMENT


         This Agreement ("Guarantee Agreement") is effective as of June 17, 1998
and is given by  ____________("Guarantor" or "you") to Motorola Inc., a Delaware
corporation ("Motorola").


                                    Recitals

         A.       Guarantor is a __________ of ARDIS Company, a New York general
partnership (hereinafter referred to as the "Borrower");

         B.       Pursuant  to  a Credit Agreement of even date between Motorola
and the  Borrower  (the  "Credit  Agreement"),  Motorola  has  agreed to provide
financing  to enable the  Borrower  to  purchase  equipment  and  services  from
Motorola;

         C.       The   Borrower   has   executed,   in  favor  of  Motorola,  a
promissory   note   (the   "Note")   in  an   aggregate   principal   amount  of
U.S.$10,000,000, plus accrued interest;

         D.       Guarantor  will  receive direct and indirect benefits from the
financing provided by Motorola to Borrower; and

         E        Motorola's  willingness  to provide the financing contemplated
by the Credit Agreement is conditioned upon and subject to your guarantee of the
Borrower's obligations thereunder and under the Note.


                                    Agreement

         In order to induce Motorola to extend credit to the Borrower, Guarantor
does hereby covenant and agree as follows:

         1. (a) Guarantor hereby  absolutely,  unconditionally  and irrevocably,
jointly with any other guarantors,  and severally,  as a primary obligor and not
merely as a surety, guarantees the full and prompt payment of all obligations of
the  Borrower  under the Note and the  Credit  Agreement,  including  the entire
outstanding  principal balance of the Note, together with accrued interest,  and
with late charges and any other  charges,  attorneys'  fees,  costs and expenses
provided for under the Credit Agreement (the "Guaranteed Obligations").  Without
limiting the generality of the  foregoing,  Guarantor's  obligations  shall also
extend to all  amounts  which  would be owed by the  Borrower  under the  Credit
Agreement and the Note, or which would become payable under such  documents,  in
each case but for the fact that they are unenforceable,  or not allowable due to
the existence of a bankruptcy,  reorganization,  or similar proceeding involving
the Borrower.

                  (b) Guarantor's  obligations hereunder shall not be subject to
any reduction,  limitation,  impairment or termination for any reason, including
but not  limited  to, any claim of waiver,  release,  surrender,  alteration  or
compromise,  and shall not be  subject to any  defense or setoff,  counterclaim,
recoupment or termination whatsoever by reason of any of the following:  (i) the
invalidity or  unenforceability  of the Note or the Credit Agreement or any part
thereof;  (ii) any  extension,  modification  or renewal of, or indulgence  with
respect to, or  substitutions  for, the sum  evidenced by the Note or the Credit
Agreement or any part  thereof or any  agreement  relating  thereto at any time;
(iii) any failure or omission to enforce any right,  power or remedy against the
Borrower or any guarantor with respect to the Credit Agreement,  the Note or any
part  thereof;  (iv) any waiver of any right,  power or remedy or of any default
with respect to the Credit Agreement,  the Note or any part thereof or any other
agreement relating thereto; or (v) any compromise,  settlement,  waiver or other
modification,  or any release or surrender,  whether or not knowingly given with
the consent of Motorola, with or without consideration, of the Credit Agreement,
the Note, any other guarantees with respect to the Credit Agreement, the Note or
any part thereof or any other obligation of any person or entity with respect to
the Credit Agreement, the Note or any part thereof.  Guarantor will not exercise
any  rights  that  it may  have  by  way of  subrogation  under  this  Guarantee
Agreement,  or  otherwise,  until all amounts owed to Motorola  under the Credit
Agreement have been indefeasibly paid in full. Guarantor  acknowledges that time
is of the essence of this Guarantee Agreement.

                  (c)   This Guarantee Agreement shall be a continuing guarantee
and shall  remain valid and in full force and effect as to all  indebtedness  of
the  Borrower now or  hereafter  arising  pursuant to and under the terms of the
Credit Agreement and the Note.

         2.  As  long  as any  of  the  Guaranteed  Obligations  remain  unpaid,
Guarantor  agrees that this Guarantee  Agreement shall be an absolute,  present,
continuing,  unlimited,  unconditional and irrevocable  guaranty of payment (and
not of  collection).  Suit may be brought and  maintained  against  Guarantor by
Motorola to enforce  any  liability,  obligation  or duty  guaranteed  hereunder
without  joinder of any other person or entity  (including,  but not limited to,
the Borrower).  The liability of Guarantor under this Guarantee  Agreement shall
not be deemed to be waived,  released,  discharged,  impaired or affected by any
foreclosure,  indulgence,  or variation of terms of the Credit  Agreement or the
Note or any part  thereof,  whether  or not it might  vary the risk of  guaranty
under  this  Guarantee  Agreement,   including,   without  limitation,  (i)  any
alteration, amendment,  acceleration,  extension, modification, waiver or change
concerning  the amount of time or manner of payment or performance of any of the
Guaranteed Obligations;  (ii) any discharge or release of any of the obligations
securing the payment or performance  thereof,  whether or not in accordance with
the respective provisions thereof; (iii) bankruptcy, insolvency, reorganization,
liquidation or similar proceedings  concerning the Borrower,  Guarantor,  or any
other guarantor of all or any part of the Borrower's debts to Motorola; (iv) the
addition  or omission  or delay in the  enforcement  of any right or remedy with
respect to any of the  Guaranteed  Obligations or with respect to this Guarantee
Agreement;  or (v) the  receipt,  exchange,  surrender or  acquiescence  in, any
default with respect to any of the Guaranteed Obligations.

         3. Guarantor represents and warrants to Motorola as follows:

                  (a) Guarantor is a [relationship] of the Borrower;

                  (b) The  execution,  delivery and  performance by Guarantor of
this  Guarantee  Agreement  will  not  violate  any  agreements   governing  the
Guarantor, any provision of law or any order of any court or governmental agency
binding upon Guarantor or any of its property,  or the terms of any  instrument,
document or agreement  to which  Guarantor is a party,  either  individually  or
jointly,  with  any  other  person,  firm,  entity  or  corporation  or by which
Guarantor or any of the property of Guarantor is bound,  or be in conflict with,
result in a breach of, or constitute  (with giving of notice,  the lapse of time
or both) a default under any such instrument,  document or agreement,  or result
in the creation or  imposition of any lien upon any of the property or assets of
Guarantor;

                  (c) This Guarantee Agreement constitutes the valid and legally
binding  obligation of  Guarantor,  enforceable  in  accordance  with its terms,
except as  enforceability  thereof  may be  limited  by  applicable  bankruptcy,
insolvency, reorganization, moratorium or similar laws affecting the enforcement
of creditors' rights generally and general equitable principles; and

                  (d) Guarantor  has  made  an  independent  determination  with
respect to the Borrower's  capacity to repay the Note and the Borrower's  future
business  prospects;  Guarantor  has not  relied on any  financial  information,
representation, or other communication from Motorola regarding such matters.

                  (e) Guarantor  represents that except as disclosed on Schedule
A  to  this  Guarantee  Agreement,   Guarantor  has  no  outstanding   guarantee
obligation,  or any other direct or indirect contingent obligation in respect of
indebtedness  of the  Borrower or any other Person which is secured by a lien on
or pledge of any assets or rights of Guarantor  (any such  obligation  excluding
those disclosed on Schedule A a "Secured  Guarantee");  Guarantor covenants that
if  at  any  time  while  any  Guaranteed   Obligations  remain  outstanding  or
unsatisfied, Guarantor shall enter into any Secured Guarantee for the benefit of
any  creditor,  Guarantor  shall  cause its  obligations  under  this  Guarantee
Agreement  to be secured on a pari passu basis with its  obligations  under such
Secured Guarantee.

         4. (a)  Guarantor  will pay,  discharge  or  otherwise  satisfy  in the
ordinary course of business (a) all  Indebtedness,  (b) all other obligations to
the extent such  obligations  exceed,  in the aggregate,  $1,000,000 and (c) all
obligations and amounts owing to the operator of the PSTN,  except,  in any such
case, to the extent that (i) the amount or validity of any such  Indebtedness or
other  obligation  is currently  being  contested  in good faith by  appropriate
proceedings,  (ii)  appropriate  reserves  in  conformity  with  GAAP  have been
provided on your books, and (iii) such matter does not involve any risk of loss,
forfeiture, or Lien on your assets.

         (b)  Guarantor  will (a)  continue  to engage in  business  of the same
general type as now conducted by it, (b) preserve and maintain in full force and
effect its corporate  existence and good standing under the laws of its State of
incorporation,  (c)  preserve  and maintain in full force and effect all rights,
privileges  qualifications,   permits,  licenses  and  franchises  necessary  or
desirable in the normal conduct of its business, (d) use its reasonable efforts,
in the ordinary course and consistent  with past practice,  to its your business
organization and preserve the goodwill and business of the customers,  suppliers
and others having business  relations with it , and (e) preserve or renew all of
its registered  trademarks,  trade names and service marks, the non-preservation
of which  could  have a material  adverse  effect on its  business,  operations,
financial condition, or its ability to its your obligations hereunder.

         (c)  Guarantor  will  keep  proper books of record and account in which
full,  true, and correct entries in conformity with GAAP and all Requirements of
Law shall be made to reflect  truly the  financial  position and the results its
operations.  Upon reasonable  notice,  Guarantor will permit  representatives of
Motorola  to visit  and  inspect  any of its  properties  and  examine  and make
extracts from and copies of any of its books and records at any reasonable  time
during  normal  business  hours and as often as may  reasonably  be  desired  by
Motorola,  and to  discuss  Guarantor's  business,  operations,  properties  and
financial and other condition.

         (d)  So  long as the Credit remains outstanding and unpaid or any other
amount  is owing  by  Borrower  to  Motorola,  Guarantor  will  comply  with the
following unless Motorola has consented in writing to your failure to so comply:

                  (i). Guarantor will not enter into any merger or consolidation
or  amalgamation,  will  not  liquidate,  wind up or  dissolve  (or  suffer  any
liquidation or dissolution), and shall not convey, sell, lease, assign, transfer
or  otherwise  dispose of any of its  property,  business or assets  (including,
without  limitation,  receivables and leasehold  interests) whether now owned or
hereafter  acquired  (except  the sale or other  disposition  of assets for good
consideration in the ordinary course of business) if any such transaction  might
materially  adversely the  Guarantor's  business,  financial  condition,  or its
ability to perform its obligations hereunder.

                  (ii) Guarantor  will not amend, supplement or otherwise modify
or waive  compliance  with any  provision  of its articles of  incorporation  or
by-laws  if such  amendment,  supplement,  modification  or waiver  would have a
material  adverse  effect  on its  business,  operation,  assets  (taken  in the
aggregate) or financial  condition,  or would otherwise materially and adversely
affect its ability to perform its obligations hereunder.

                  (iii) Guarantor will  not  transfer or attempt to transfer its
FCC  licenses  to  operate  any paging  system to any  Person  other than in the
ordinary course of business.

                  (iv)  Guarantor  will not engage in the  purchase of goods and
services, directly or indirectly, on any basis other than arms'-length.

                  (v)  Guarantor   will  not  form,   create,   or  acquire  any
subsidiaries except those identified on Schedule 2 hereto.

         5.       This  Guarantee  Agreement  is,  and  shall be deemed to be, a
contract  entered into,  under and pursuant to the substantive laws of the State
of Illinois, without regard to the conflict of laws rules thereof.

         6.       Guarantor  agrees  that if Motorola shall employ legal counsel
in order to  successfully  present,  enforce or defend any or all of  Motorola's
rights or remedies  hereunder,  then in any such event,  Guarantor shall pay all
reasonable  attorneys'  fees and  reasonable  costs  and  expenses  incurred  by
Motorola in connection therewith.

         7.        All  notices,  requests,  demands  and  other  communications
hereunder  shall be in  writing  and shall be deemed to have been given (a) when
hand  delivered  (or if  delivery  is  refused,  at the time of  refusal) to the
address  set forth  below,  (b) when  received  or refused as  evidenced  by the
delivery  receipt if sent by Certified  Mail,  Return  Receipt  Requested,  with
proper  postage  prepaid,  addressed  as set forth below,  (c) when  received or
refused as evidenced by the delivery receipt if sent by reputable  international
courier,  with delivery  charges  prepaid,  addressed as set forth below, or (d)
when received as evidenced by the transmission report of the telecopy machine of
the transmitting party  acknowledging a good transmission if sent by telecopy to
the number set forth below:

If to MOTOROLA INC. at:                         With a copy to:
                                                Motorola Paging Products Group
1303 East Algonquin Road                        5401 North Beach Street
Schaumburg, Illinois  60196                     Fort Worth, Texas 76137
                                                Attn: __________
                                                Telephone: (817) ________
                                                Telecopy:  (817) 245-2236


If to the Guarantor, at:                        With a copy to:
- -----------------------------                   -------------------------------

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

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

Telephone: ___________________                  Telephone: ___________________
Telecopy:  ___________________                  Telecopy:  ___________________



         8. No  modification  or  waiver  of any  provision  of  this  Guarantee
Agreement shall be effective  unless the same shall be in a writing signed by an
officer of  Motorola  and each  other  party  whose  rights or  obligations  are
affected thereby.  No failure or any delay on the part of Motorola in exercising
any right, power or privilege  hereunder shall operate as a waiver thereof;  nor
shall a single or partial exercise of any right,  power or privilege  constitute
an election of remedy or otherwise preclude any other or future exercise thereof
or the exercise of any other right, power or privilege granted by this Guarantee
Agreement or by law. The rights,  powers and privileges  provided for herein are
cumulative  of each other and of those  provided for by law and none of them are
exclusive of any of the others or those provided for by law.

         9. Subject  to  the  restrictions  on assignment contained herein, this
Guarantee  Agreement  shall be  binding  upon and  inure to the  benefit  of the
parties hereto and their respective  successors and permitted assigns.  Motorola
shall  have  full  right to assign  its  rights  and  delegate  its  obligations
hereunder or any interest  herein in full, or in part,  in  connection  with any
assignment  (including  but not  limited to the sale of  participations)  of its
rights under the Credit  Agreement.  Guarantor shall have no right to assign any
of its rights or delegate any of its  obligations  hereunder to any other person
or entity without the prior written consent of an officer of Motorola.

         10. Motorola shall endeavor to give Guarantor notice of default or non-
performance  by the  Borrower in  connection  with any breach of the Note or the
Credit  Agreement,  but no delay or failure by  Motorola to give any such notice
shall in any way  detract  from,  limit or  release  the  Guarantor  from any of
Guarantor's  obligations  under this Guarantee  Agreement.  The Guarantor hereby
waives  presentment,  protest,  notice of protest and notice of either dishonor,
default or  nonperformance  in connection  with any of  Guarantor's  obligations
under this Guarantee  Agreement to the fullest extent it may lawfully do so, and
any and all  demands  and other  notice of every kind that may be required to be
given by law.

         11. Upon  any  determination  that  any  provision  hereof  is invalid,
illegal or  unenforceable  in any respect,  this  Guarantee  Agreement  shall be
deemed  to be  modified  accordingly  so as to be valid and  enforceable  to the
maximum  extent  allowed by law and the remaining  terms and  provisions of this
Guarantee  Agreement  shall not be affected  thereby and shall  continue in full
force and effect.

         12.  This  Guarantee  Agreement  shall  be  effective  upon the date of
execution hereof and the obligations of the Guarantor shall continue, subject to
the next  sentence,  until the  receipt  by  Motorola  of payment in full of all
amounts due Motorola under the Credit  Agreement.  The  obligations of Guarantor
under this  Guarantee  Agreement  shall  continue  to be  effective  or shall be
reinstated,  as applicable, if at any time any payment received by Motorola with
respect to any of the Guaranteed  Obligations,  or this Guarantee Agreement,  is
rescinded or must be returned to the Borrower upon the insolvency, bankruptcy or
reorganization of the Borrower, and in each such case the rights of Motorola and
Guarantor's  obligations  under  this  Guarantee  Agreement  shall be treated as
though such payments were never made.

         13.Guarantor hereby acknowledges that this Guarantee Agreement is given
in order to enhance the ability of the  Borrower to perform its  obligations  to
Motorola under the Credit Agreement.

         14.Nothing  in  this Guarantee Agreement or any of the other agreements
related to the  financing  of the  Borrower's  paging  system shall be deemed to
constitute  any kind of  partnership,  joint venture or other common  enterprise
between  Guarantor  and Motorola or any kind of fiduciary  relationship  between
Motorola and Guarantor.

         15.Motorola shall have no liability to Guarantor under or in connection
with the financing of the Borrower's paging system for any special,  incidental,
indirect,  consequential or punitive damages of any kind or nature, even if such
damages may be reasonably foreseeable.

         16.Guarantor  hereby subordinates, to all rights of Motorola as against
the Borrower, all rights to payment, claims, and other interests of Guarantor in
or against Borrower.

         17. ANY SUIT,  ACTION OR  PROCEEDING  AGAINST ANY PARTY WITH RESPECT TO
THIS AGREEMENT,  OR ANY OTHER OBLIGATION OR ANY JUDGMENT ENTERED BY ANY COURT IN
RESPECT OF ANY THEREOF MAY BE BROUGHT IN THE  APPROPRIATE  COURT OF THE STATE OF
ILLINOIS,  U.S.A.,  OR IN THE  APPROPRIATE  U.S.  DISTRICT COURT IN THE STATE OF
ILLINOIS, U.S.A., AND EACH PARTY HERETO HEREBY IRREVOCABLY SUBMITS GENERALLY AND
UNCONDITIONALLY  TO THE  NONEXCLUSIVE  JURISDICTION  OF EACH SUCH  COURT FOR THE
PURPOSE OF ANY SUCH SUIT,  ACTION OR  PROCEEDING.  EACH PARTY HERETO AGREES THAT
SERVICE  OF ALL  WRITS,  PROCESS  AND  SUMMONSES  IN ANY SUCH  SUIT,  ACTION  OR
PROCEEDING BROUGHT IN THE STATE OF ILLINOIS, U.S.A., MAY BE MADE UPON EACH PARTY
AT ITS RESPECTIVE ADDRESS ABOVE. EACH PARTY HERETO HEREBY  IRREVOCABLY  CONSENTS
TO THE  SERVICE OF PROCESS IN ANY  ACTION OR  PROCEEDING  IN SAID  COURTS BY THE
MAILING THEREOF BY REGISTERED OR CERTIFIED MAIL, POSTAGE PREPAID,  TO IT AT SUCH
ADDRESS.  EACH PARTY HERETO HEREBY IRREVOCABLY WAIVES ANY OBJECTION WHICH IT MAY
NOW OR  HEREAFTER  HAVE TO THE  LAYING  OF  VENUE OF ANY SUCH  SUIT,  ACTION  OR
PROCEEDING  BROUGHT IN ANY SUCH COURT AND HEREBY FURTHER  IRREVOCABLY WAIVES ANY
CLAIM THAT ANY SUCH  SUIT,  ACTION OR  PROCEEDING  BROUGHT IN ANY SUCH COURT HAS
BEEN BROUGHT IN AN INCONVENIENT FORUM.

         18. GUARANTOR  AND  MOTOROLA  EACH  HEREBY  KNOWINGLY,  VOLUNTARILY AND
INTENTIONALLY  WAIVE THE RIGHT EITHER MIGHT HAVE TO A JURY TRIAL WITH RESPECT TO
ANY  LITIGATION OR ACTION BASED  HEREON,  ARISING OUT OF, UNDER OR IN CONNECTION
WITH THIS GUARANTEE  AGREEMENT OR THE NOTE, OR ANY COURSE OF CONDUCT,  COURSE OF
DEALING, STATEMENTS (WHETHER VERBAL OR WRITTEN), OR ACTIONS OF ANY PARTY TO THIS
GUARANTEE AGREEMENT OR THE NOTE.



                                     [GUARANTOR]


                                     By:____________________________________
                                     Its:___________________________________




<PAGE>



                             SCHEDULE 1 TO GUARANTEE
                                       OF
                                   [GUARANTOR]

                     Secured Guarantees as of June 17, 1998






<PAGE>


                             SCHEDULE 2 TO GUARANTEE
                                       OF
                                   [GUARANTOR]

                                  Subsidiaries



<PAGE>










                                    EXHIBIT D

                      LIST OF SUBSIDIARIES OF THE BORROWER

                                      None.



<PAGE>





                                    EXHIBIT E

                           FORM OF FINANCING STATEMENT





<PAGE>





                                    EXHIBIT F

                      LIST OF ASSUMED NAMES OF THE BORROWER

                                      None



<PAGE>


                                  Exhibit 11.1

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

<TABLE>
<CAPTION>

                                                                     Three Months                        Six Months
                                                                    Ended June 30,                     Ended June 30,

                                                                1998             1997             1998              1997
                                                                ----             ----             ----              ----
BASIC EARNINGS PER SHARE CALCULATION

<S>                                                        <C>               <C>              <C>               <C>      
Net Loss                                                   ($38,963)         ($26,842)        ($64,205)         ($53,923)
                                                           =========         =========        =========         =========

Net Loss per common share                                    ($1.23)           ($1.07)          ($2.25)           ($2.15)
                                                             =======           =======          =======           =======

Weighted-average common shares                               31,719            25,120           28,502            25,115
                                                             ======            ======           ======            ======
outstanding

DILUTED EARNINGS PER SHARE CALCULATION
Net Loss                                                   ($38,963)         ($26,842)        ($64,205)         ($53,923)
                                                           =========         =========        =========         =========

Net Loss per common share                                    ($1.21)           ($1.07)          ($2.24)           ($2.14)
                                                             =======           =======          =======           =======

Weighted-average common shares (1)                           32,102            25,182           28,614            25,177
                                                              ======           ======           ======            ======
(1)   Calculated as follows: 
      Historical weighted average number of
          shares outstanding                                 31,719            25,120           28,502            25,115
      Assumed exercise of stock options                          --                --                1                --
      Assumed exercise of stock purchase                        383                62              111                62
                                                             -------          --------         --------           -------
warrants
                                                             32,102            25,182           28,614            25,177
                                                             ======           =======           ======            ======

</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 six months ended
June 30, 1998,  and is qualified in its entirety by reference to such  financial
statements.
</LEGEND>
<MULTIPLIER>                                1,000
<CURRENCY>                                  U.S. Dollars
       
<S>                                         <C>
<PERIOD-TYPE>                               6-MOS
<FISCAL-YEAR-END>                           DEC-31-1998
<PERIOD-START>                              JAN-01-1998
<PERIOD-END>                                JUN-30-1998
<EXCHANGE-RATE>                             1
<CASH>                                      8,944
<SECURITIES>                                125,008
<RECEIVABLES>                               13,279
<ALLOWANCES>                                0
<INVENTORY>                                 41,038
<CURRENT-ASSETS>                            123,743
<PP&E>                                      265,788
<DEPRECIATION>                              0
<TOTAL-ASSETS>                              562,402
<CURRENT-LIABILITIES>                       55,091
<BONDS>                                     466,581
                       0
                                 0
<COMMON>                                    318
<OTHER-SE>                                  44,166
<TOTAL-LIABILITY-AND-EQUITY>                562,402
<SALES>                                     5,740
<TOTAL-REVENUES>                            22,410
<CGS>                                       5,415
<TOTAL-COSTS>                               32,818
<OTHER-EXPENSES>                            14,457
<LOSS-PROVISION>                            0
<INTEREST-EXPENSE>                          15,706
<INCOME-PRETAX>                             (38,963)
<INCOME-TAX>                                0
<INCOME-CONTINUING>                         (38,963)
<DISCONTINUED>                              0
<EXTRAORDINARY>                             0
<CHANGES>                                   0
<NET-INCOME>                                (38,963)
<EPS-PRIMARY>                               (1.23)
<EPS-DILUTED>                               0
        


</TABLE>


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