AMERICAN MOBILE SATELLITE CORP
8-K, 1998-04-15
COMMUNICATIONS SERVICES, NEC
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT

     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934




                                 March 31, 1998
                Date of Report (Date of earliest event reported)



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



              DELAWARE                 0-23044                  93-0976127
 (State or  other jurisdiction       (Commission               (IRS Employer
         of incorporation)           File Number)           Identification No.)



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

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





<PAGE>





Item 2.  Acquisition or Disposition of Assets

As  previously   reported,   on  March  31,  1998,  the  Company  acquired  (the
"Acquisition")  ARDIS Company ("ARDIS") from Motorola,  Inc.  ("Motorola"),  and
combined the ARDIS terrestrial-based  business with the satellite-based business
operated through its subsidiary AMSC Subsidiary Corporation.

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

As previously reported, in connection with the Acquisition,  the Company and its
subsidiaries  entered  into  agreements  with  respect to three  financings  and
refinancings:  (1) $335 million of Units  consisting of 12 1/4% Senior Notes due
2008 and  Warrants  to  purchase  shares of  Common  Stock of the  Company  (the
"Offering");  (2) a $100 million  Revolving  Credit  Facility and a $100 million
Term Loan Facility (the "New Bank Financing");  and (3) a $10 million commitment
with respect to Motorola vendor financing.


<PAGE>



Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits

         (a)      Financial Statements.

                  Audited  financial  statements  of ARDIS  Holding  Company,  a
                  wholly-owned  business of  Motorola,  Inc. as of December  31,
                  1997 and 1996  together  with the  report  of the  independent
                  auditors thereon.  (Filed herewith).

         (b)      Pro Forma Financial Statements.

                  Unaudited  pro  forma   combined   balance  sheet  as  if  the
                  acquisition  occurred on December 31, 1997,  and unaudited pro
                  forma  combined  income  statement for the year ended December
                  31, 1997,  as if the  acquisition  occurred on January 1, 1997
                  (Filed herewith).

         (c)      Exhibits.

                  10.65    Stock  Purchase  Agreement for  the   Acquisition  of
                           Motorola   ARDIS   Acquisition,   Inc.  and  Motorola
                           ARDIS, Inc. by  AMSC  Acquisition  Company,  Inc.,  a
                           Wholly-Owned Subsidiary  of American Mobile Satellite
                           Corporation,    Dated   as   of   December  31,  1997
                           (Incorporated   by   reference   to   Exhibit   10.65
                           previously filed with the Report on Form 10-K for the
                           period ending December 31, 1997 (File No. 0-23044)).

                  23.3     Consent of KPMG Peat Marwick LLP.

                  99(16)   American  Mobile  Satellite Corporation Press Release
                           No. 98-7 dated March 31, 1998.

                  99(17)   Audited   financial   statements   of  ARDIS  Holding
                           Company,  a  wholly-owned  business unit of Motorola,
                           Inc. as of December 31, 1996 and 1997  together  with
                           the  report  of the  independent  public  accountants
                           thereon.

                  99(18)   Unaudited pro forma combined  balance sheet as if the
                           acquisition   occurred  on  December  31,  1997,  and
                           unaudited pro forma  combined  income  statements for
                           the  year  ended   December   31,   1997  as  if  the
                           acquisition occurred on January 1, 1997.







<PAGE>







                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.



                                  AMERICAN MOBILE SATELLITE CORPORATION
                                  (Registrant)



Date: April 15, 1998              /s/Randy S. Segal
                                  Randy S. Segal
                                  Secretary








<PAGE>



                                  EXHIBIT INDEX

Exhibit
Number                                      Exhibit

10.65   --          Stock  Purchase  Agreement for the  Acquisition  of Motorola
                    ARDIS  Acquisition,  Inc. and Motorola  ARDIS,  Inc. by AMSC
                    Acquisition  Company,  Inc., a  Wholly-Owned  Subsidiary  of
                    American Mobile Satellite Corporation,  Dated as of December
                    31,  1997   (Incorporated  by  reference  to  Exhibit  10.65
                    previously filed with the Report on Form 10-K for the period
                    ending December 31, 1997 (File No. 0-23044)).

23.3     --         Consent of KPMG Peat Marwick LLP

99(16)    --        American Mobile Satellite Corporation Press Release No. 98-7
                    dated March 31, 1998.

99(17)    --        Audited  financial  statements of ARDIS Holding  Company,  a
                    wholly-owned  business of Motorola,  Inc. as of December 31,
                    1996  and  1997  together  with the  report  of  independent
                    auditors thereon.

99(18)    --        Unaudited  pro  forma  combined  balance  sheet  as  if  the
                    acquisition  had occurred on December 31, 1997 and unaudited
                    pro forma  combined  income  statements  for the year  ended
                    December  31,  1997 as if the  acquisition  had  occurred on
                    January 1, 1997.



























                                                                    EXHIBIT 23.3




Consent of KPMG Peat Marwick LLP

INDEPENDENT AUDITORS' CONSENT

We consent to the  incorporation  by reference of our report dated  February 13,
1998 relating to the combined  financial  statements of ARDIS Holding Company as
of December 31, 1996 and 1997 and for each of the years in the three-year period
ended  December  31,  1997,  included  in this Form 8-K,  into  American  Mobile
Satellite  Corporation's  previously filed  Registration  Statements on Form S-8
(file nos. 33-72852, 33-34250, 33-91714, and 333-30099).

/s/ KPMG Peat Marwick LLP
April 14, 1998
Chicago, Illinois







                                                                  EXHIBIT 99(16)

                                                                    NEWS RELEASE


                               Reference: 98 - # 7

            American Mobile Completes Acquisition of ARDIS, Creating
                  Integrated Terrestrial/Satellite Data Network

          $335 Million Bond Offering Funds Acquisition, Company Growth


     RESTON,  Va.,  March  31,  1998 -  American  Mobile  Satellite  Corporation
(NASDAQ:  SKYC) today completed its acquisition of ARDIS Company, which owns and
operates the nation's largest terrestrial,  two-way wireless data communications
network.  With  the  merger,  American  Mobile  is  positioned  to  leverage  an
integrated  terrestrial/satellite  network to advance its leadership in wireless
data services.

     The combined  company serves more than 80,000  subscribers,  and has annual
service  revenue in excess of $60 million.  The new  American  Mobile has proven
nationwide wireless communications  services,  including data and voice dispatch
communications for the  transportation,  field services,  maritime and emergency
response markets, as well as two-way messaging, and telemetry services.

     "This  transaction  solidifies our position as a single-source  for a broad
range of  cost-effective  nationwide  wireless  communications  services,"  said
President  Walt  Purnell.   "It  represents  the   culmination  of  a  long-term
partnership  between  ARDIS and American  Mobile,  and enables us to provide the
first  fully-deployed  and owned  terrestrial/satellite  network  that  provides
complete U.S. coverage.  We have the expertise,  products and financial strength
to  leverage  our  integrated  network to meet  accelerating  market  demand for
wireless communications services."

     Walt Purnell,  formerly president and chief executive officer of ARDIS, was
named  president of American  Mobile.  Purnell  joined ARDIS as chief  financial
officer  in 1990 and was  named  president  in 1995.  Gary  Parsons,  previously
president of American Mobile,  continues as chief executive and becomes chairman
of the board,  while former  board  Chairman  Jack Shaw  continues to serve as a
director of the company and chairman of the executive committee.

     In a simultaneous transaction, the company closed a $335 million high yield
debt offering that consists of 335,000 units of 12 1/4 percent  senior notes due
2008 and warrants to purchase 1.26 million shares of the company's  common stock
at an exercise  price of $12.51.  The offering was made  pursuant to  regulation
144A in the private  market,  with proceeds used to fund the cash portion of the
ARDIS acquisition, pay down the company's existing debt, purchase a portfolio of
government securities  sufficient to fund three years of interest payments,  and
provide for the working  capital needs of the company.  "We are clearly  pleased
with  the  successful  financing  and the  strategic  position  of the  combined
company," said Gary Parsons. "The strength of the combined network technologies,
customer base and market strategy was recognized by the bond investors, and Wall
Street in general." Also completed  today was a  restructuring  of the company's
existing  $200  million   guaranteed  bank   financing.   The  new  facility  is
underwritten by Morgan Guaranty Trust Company, Toronto Dominion Bank and Bank of
America NT&SA, and is guaranteed by Hughes  Electronics  Corporation,  Singapore
Telecommunications Ltd. and Baron Capital Partners, L.P., three of the company's
largest shareholders.  American Mobile Satellite Corporation  (www.AmMobile.com)
owns and  operates an  integrated  terrestrial/satellite  network and provides a
wide range of mobile communication  services,  including digital voice dispatch,
data  communications,  mobile  messaging and position  reporting  services,  and
satellite  telephone to the continental U.S., Alaska,  Hawaii,  Puerto Rico, the



<PAGE>



Virgin Islands,  and hundreds of miles of U.S.  coastal waters.  American Mobile
services  are  used in the  transportation,  field  service,  maritime,  two-way
messaging  and  telemetry  markets.  As a result of the  acquisition  agreement,
Motorola,  Inc.,  joins Hughes  Communications  Inc.,  Baron Capital,  Singapore
Telecom, and AT&T Wireless Services as the company's major shareholders.

                                       ###



Renate Brown Neely/Naomi Yeransian                 Jennifer Riggle/Jon Bornstein
American Mobile                                             Copithorne & Bellows
703-716-6558/847-913-4233                              202-973-5847/919-562-6787
[email protected]                               [email protected]


Factors  that could cause  forward-looking  statements  in this news  release to
differ materially from actual results are discussed in American Mobile Satellite
Corporation's  Form 10K for the year ended  December 31, 1997 and other periodic
filings the company has made with the Securities and Exchange Commission. Copies
of the filings  are  available  upon  request  from  American  Mobile  Satellite
Corporation's investor relations department.






                                                                  EXHIBIT 99(17)


Audited Financial Statements

ARDIS HOLDING COMPANY
Combined Financial Statements
December 31, 1996 and 1997
(With Independent Auditors' Report Thereon)



<PAGE>



Independent Auditors' Report


The Board of Directors
Motorola, Inc.:


We have  audited  the  accompanying  combined  balance  sheets of ARDIS  Holding
Company  (Company),  a  wholly-owned  business  of  Motorola,  Inc.  (Parent) as
described  in Note 2, Basis of  Presentation,  as of December 31, 1996 and 1997,
and the related combined  statements of operations,  stockholders'  equity,  and
cash flows for each of the years in the  three-year  period  ended  December 31,
1997.  These  financial  statements  are  the  responsibility  of the  Company's
management.  Our  responsibility  is to express  an  opinion on these  financial
statements based on our audits.

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

In our opinion,  the combined  financial  statements  referred to above  present
fairly,  in all  material  respects,  the  financial  position of ARDIS  Holding
Company as of December  31, 1996 and 1997,  and the results of their  operations
and  their  cash  flows  for each of the years in the  three-year  period  ended
December 31, 1997 in conformity with generally accepted accounting principles.




/s/KPMG Peat Marwick LLP
February 13, 1998
Chicago, Illinois



<PAGE>



ARDIS HOLDING COMPANY
<TABLE>

Combined Balance Sheets

December 31, 1996 and 1997
(amounts in thousands)
<CAPTION>

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

                  Assets                                                        1996                      1997
- -------------------------------------------------------------------------------------------------------------------

<S>                                                                            <C>                       <C>   
Current assets:
     Cash and cash equivalents                                                 $ 5,289                   $ 2,082
     Accounts receivable, less allowance for doubtful
         accounts of $754 in 1996 and $264 in 1997,
         including amounts due from Parent of $142
         in 1996 and $47 in 1997                                                 7,809                     7,642
     Inventory, including $514 in 1996 and $154 in
         1997, acquired from Parent                                              1,211                       342
     Prepaid site rent, including, $2,500 in 1996
         to Parent                                                               4,418                     2,075
     Prepaid expenses and other current assets                                   2,184                     1,104
- -------------------------------------------------------------------------------------------------------------------

Total current assets                                                            20,911                    13,245
- -------------------------------------------------------------------------------------------------------------------


Property and equipment - net, principally acquired
     from Parent                                                                53,302                    41,801
- -------------------------------------------------------------------------------------------------------------------


Intangible assets, net                                                          16,303                    14,567
Other noncurrent assets                                                            736                       217
- -------------------------------------------------------------------------------------------------------------------

                                                                               $91,252                   $69,830
- -------------------------------------------------------------------------------------------------------------------

     Liabilities and Stockholders' Equity

Current liabilities:

     Accounts payable, including amounts due to Parent
         of $340 in 1996 and $471 in 1997                                      $ 4,011                   $ 4,012
     Accrued expenses, including amounts due to
         Parent of $492 in 1996 and $204 in 1997                                 2,646                     1,717
     Accrued payroll and related taxes                                           2,153                     1,070
     Capital lease obligation                                                    3,565                     3,900
     Advance deposits                                                                -                     1,402
     Accrued taxes                                                                 906                       706
- -------------------------------------------------------------------------------------------------------------------


Total current liabilities                                                       13,281                    12,807
- -------------------------------------------------------------------------------------------------------------------


Capital lease obligation                                                        12,830                     8,931
- -------------------------------------------------------------------------------------------------------------------


Stockholders' equity                                                            65,141                    48,092
- -------------------------------------------------------------------------------------------------------------------


Total liabilities and stockholders' equity                                     $91,252                   $69,830
- -------------------------------------------------------------------------------------------------------------------


See accompanying notes to combined financial statements.

</TABLE>


<PAGE>



ARDIS HOLDING COMPANY
<TABLE>

Combined Statements of Operations

Years ended December 31, 1995, 1996, and 1997

(amounts in thousands)
<CAPTION>

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

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

<S>                                                                         <C>           <C>       <C>         
Revenues:
     Services, including revenues from Parent of $622, $613, and $294
         for the years ended December 31,
         1995, 1996, and 1997, respectively.                                $40,006      $43,413       $41,923
     Equipment                                                                1,266        1,884         2,326
- -------------------------------------------------------------------------------------------------------------------

Total revenues                                                               41,272       45,297       44,249
- -------------------------------------------------------------------------------------------------------------------

Costs and expenses:
     Costof service and operations, including costs of providing  
         services to Parent of $9,180, $7,694, and $7,569 for the
         years ended December 31, 1995, 1996, and 1997, respectively.        39,884       32,805       31,940
     Cost of equipment sold, including costs of equipment
         purchased from Parent of $938, $1,033, and $1,324 for the years
         ended December 31, 1995, 1996, and 1997, respectively.               1,878        1,350        2,233
     Sales and advertising, including expenses from Parent
         of $734, $50, and $54 for the years ended December 31,
         1995, 1996, and 1997, respectively.                                 15,164       13,677        5,888
     General and administrative, including expenses related
         to Parent of $300, and $150 for the years ended
         December 31, 1995 and 1996, respectively.                           10,623        9,364        6,970
     Depreciation and amortization principally
         related to assets acquired from Parent                              14,355       17,269       14,586
- -------------------------------------------------------------------------------------------------------------------


                                                                             81,904       74,465       61,617
- -------------------------------------------------------------------------------------------------------------------


Operating loss                                                              (40,632)     (29,168)     (17,368)

Interest income                                                                 481          198          150
Interest expense                                                               (688)      (1,556)      (1,331)
- -------------------------------------------------------------------------------------------------------------------


Loss before income tax benefit                                              (40,839)     (30,526)     (18,549)

Income tax benefit                                                           15,586       11,528        6,807
- -------------------------------------------------------------------------------------------------------------------

Net loss                                                                   $(25,253)    $(18,998)    $(11,742)
- -------------------------------------------------------------------------------------------------------------------


See accompanying notes to combined financial statements.
</TABLE>



<PAGE>



ARDIS HOLDING COMPANY
<TABLE>

Combined Statements of Stockholders' Equity

Years ended December 31, 1995, 1996, and 1997

(amounts in thousands)
<CAPTION>

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

                                                                 Stockholders'
                                                                    Equity
- --------------------------------------------------------------------------------


<S>                                                                <C>   
Balance at January 1, 1995                                          68,906

Contributions from Parent                                           44,200

Tax benefit utilized by Parent                                     (15,586)

Net loss                                                           (25,253)
- --------------------------------------------------------------------------------


Balance at December 31, 1995                                        72,267

Contributions from Parent                                           23,400

Tax benefit utilized by Parent                                     (11,528)

Net loss                                                           (18,998)
- --------------------------------------------------------------------------------


Balance at December 31, 1996                                        65,141

Contributions from Parent                                            1,500

Tax benefit utilized by Parent                                      (6,807)

Net loss                                                           (11,742)
- --------------------------------------------------------------------------------


Balance at December 31, 1997                                       $48,092
- --------------------------------------------------------------------------------


See accompanying notes to combined financial statements.
</TABLE>



<PAGE>



ARDIS HOLDING COMPANY
<TABLE>

Combined Statements of Cash Flows

Years ended December 31, 1995, 1996, and 1997

(amounts in thousands)
<CAPTION>

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

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


<S>                                                                    <C>              <C>            <C>      
Net loss                                                               $(25,253)        $(18,998)      $(11,742)
Adjustments to reconcile net loss to net cash provided by (used in)
operating activities:
     Depreciation and amortization                                       14,355           17,269         14,586
     Gain on sale of fixed assets                                             -                -            (33)
     Write-off of recorded assets                                             -                -            419
     Tax benefit utilized by Parent                                     (15,586)         (11,528)        (6,807)
     Changes in assets and liabilities:
         Accounts receivable                                             (3,030)           1,240            167
         Inventory                                                        1,329           (1,025)           869
         Prepaid site rent                                                 (685)          (1,398)         2,343
         Prepaid expenses and other assets                                  792           (1,432)         1,080
         Accounts payable                                                (1,817)             (16)             1
         Accrued expenses                                                 1,085           (2,556)          (929)
         Accrued payroll                                                    785             (902)        (1,083)
         Accrued taxes                                                   (1,381)             245           (200)
         Advance deposits                                                     -                -          1,402
         Other                                                            1,191              435            520
- -------------------------------------------------------------------------------------------------------------------


Net cash provided by (used in) operating activities                     (28,215)         (18,666)           593
- -------------------------------------------------------------------------------------------------------------------


Cash flows from investing activities:
     Capital expenditures                                               (18,811)          (3,410)        (1,431)
     Purchases of FCC licenses                                           (4,724)          (1,396)          (305)
- -------------------------------------------------------------------------------------------------------------------


Net cash used in investing activities                                   (23,535)          (4,806)        (1,736)
- -------------------------------------------------------------------------------------------------------------------


Cash flows from financing activities:
     Contributions from Parent                                           44,200           23,400          1,500
     Payments of capital lease obligations                               (1,500)          (1,624)        (3,564)
- -------------------------------------------------------------------------------------------------------------------


Net cash provided by (used in) financing activities                      42,700           21,776         (2,064)
- -------------------------------------------------------------------------------------------------------------------


Decrease in cash and cash equivalents                                    (9,050)          (1,696)        (3,207)
Cash and cash equivalents at beginning of year                           16,035            6,985          5,289
- -------------------------------------------------------------------------------------------------------------------


Cash and cash equivalents at end of year                                 $6,985           $5,289         $2,082
- -------------------------------------------------------------------------------------------------------------------


Supplemental disclosure of cash flow information:
     Cash paid for interest on capital lease obligations                   $688           $1,556         $1,331

Supplemental disclosure of noncash activities:
     Assets acquired through capital leases                              $18,831               -              -

See accompanying notes to combined financial statements.

</TABLE>

<PAGE>



ARDIS HOLDING COMPANY

Notes to Combined Financial Statements

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


(1)  Description of Business
     -----------------------

     ARDIS  Holding  Company   (Company)  is  engaged  in  the  operation  of  a
     terrestrial-based  wireless data network that provides  service coverage to
     substantially  all areas of the United  States,  Puerto Rico,  and the U.S.
     Virgin  Islands.  This network  includes radio  frequency  towers,  or base
     stations,   for   transmitting  and  receiving  radio  signals  among  data
     terminals.  The network  operates in the 800 MHZ frequency  band  utilizing
     licenses  owned by the  Company.  The base  stations  are located on leased
     antenna sites.

     The Company provides wireless data services primarily to business customers
     in  many   varying   market   segments,   including   field   services  and
     transportation market segments which require nationwide,  reliable wireless
     data services. The Company derives revneues from monthly variable and fixed
     usage charges,  as well as access fees,  rental fees, and equipment  sales.
     The Company obtains and supports customers through direct sales efforts and
     reseller arrangements.

(2)  Basis of Presentation
     ---------------------

     The  accompanying  financial  statements  present  the  combined  financial
     position,   results  of  operations,  adn  cash  flows  of  Motorola  ARDIS
     Acquisition,  Inc. (MAA) and Motorola ARDIS,  Inc. (MAI), each wholly-owned
     subsidiaries  of  Motorola,  Inc.  (Parent).  Each of MAA and MAI own a 50%
     partnership  interest in ARDIS Holding  Company.  ARDIS Holding Company was
     formed in April,  1990 as a 50/50  joint  venture  between  Motorola,  Inc.
     (Motorola) and International Business Machine Corporation (IBM) to deploy a
     terrestrial based wireless data network in the United States.  Hereinafter,
     except as  otherwise  indicated,  MAA and MAI are referred to on a combined
     basis as ARDIS  Holding  Company  or the  Company.  In  December,  1994 MAA
     acquired IBM's partnership interest in ARDIS Holding Company for $33,800.

     All significant intercompany transactions and balances have been eliminated
     in the combination.

(3)  Summary of Significant Accounting Policies
     ------------------------------------------

     Cash and Cash Equivalents
     -------------------------

     Cash and cash  equivalents  include all highly  liquid  investments  with a
     maturity of three months or less when purchased.

     Accounts Receivable
     -------------------

     Accounts receivable includes amounts owed by customers for airtime services
     and equipment.  A related provision for uncollectible amounts is calculated
     based on management's  estimates of amounts,  which,  based upon the credit
     risk associated with the various  classifications of customer accounts, are
     subject to substantial collection risk.

<PAGE>

     Inventory
     ---------

     Inventory  consists of reseller  hardware devices and is stated at lower of
     cost or market.  Cost is  determined  using the  weighted  average  method.
     Appropriate  consideration  is  given to  obsolescence  in  evaluating  net
     realizable value.

     Prepaid Expenses and Other Assets
     ---------------------------------

     Prepaid  expenses and other assets  consists  principally  of prepaid costs
     incurred for airpasses.  These airpasses  expire  beginning in 1999 through
     2000. The Company reduces the asset for actual usage each year and performs
     an assessment of the net  realizable  value of the asset based on projected
     usage through the expiration  period.  The current  portion of the asset is
     reflected as a prepaid  expense and the noncurrent  portion is reflected as
     an other noncurrent asset.

     Property and Equipment
     ----------------------

     Property  and  equipment  consists  of  leasehold   improvements,   network
     equipment,  and  other  equipment  and are  stated at cost or,  for  assets
     contributed, net book value as of the date of contribution. Depreciation of
     furniture and equipment is provided using the straight-line method over the
     estimated  useful  lives of the  assets  which  range  from 3 to 10  years.
     Leasehold  improvements  are  amortized  over  the  remaining  terms of the
     respective leases.  Maintenance and repairs are expensed as incurred, while
     improvements are capitalized.

     Intangible Assets
     -----------------

     Intangible  assets,  which include  license  rights and excess of cost over
     fair value, are stated at cost. License rights represent costs incurred for
     FCC issued  licenses  and are  amortized on a  straight-line  basis over an
     estimated  useful  life of 10 years.  The  excess of cost over fair  value,
     resulting  from MAA's  acquisition  of IBM's  interest in the  Company,  is
     amortized  on a  straight-line  basis over an  estimated  useful life of 10
     years.  The Company  assesses the  recoverability  of intangible  assets by
     determining  whether the amount of the balances over their  remaining lives
     can be recovered  through  undiscounted  future operating cash flows of the
     operations.

     Long-lived Assets
     -----------------

     Long-lived  assets and identifiable  intangible  assets to be held and used
     are reviewed for  impairment  whenever  events or changes in  circumstances
     indicate  that the carrying  amounts  should be  evaluated.  Impairment  is
     measured by comparing  the  carrying  value to the  estimated  undiscounted
     future  cash flows  expected to result from the use of the assets and their
     eventual  disposition.  The Company has determined  that as of December 31,
     1996 and 1997  there  has been no  impairment  in the  carrying  values  of
     long-lived assets.

     Income Taxes
     ------------

     ARDIS  Holding  Company is included  in the  consolidated  U.S.  income tax
     return of the Parent.  The tax benefit of losses have been  recorded in the
     statements of operations as the benefits are used by the Parent.

     The Company  accounts  for income  taxes in  accordance  with  Statement of
     Financial  Accounting  Standards  (SFAS) 109,  Accounting for Income Taxes.
     Cumulative deferred taxes have been settled through stockholders' equity.


<PAGE>




     Revenue Recognition
     -------------------

     The Company recognizes revenues under service agreements over the period in
     which related services are provided. Sales of equipment are recognized upon
     delivery.  To the  extent  that  management  considers  certain  recognized
     revenues  to  be  uncollectible,  a  provision  for  doubtful  accounts  is
     recognized  as a general  and  administrative  expense in the  period  such
     determination is made.

     Use of Estimates
     ----------------

     Management  of the Company has made a number of estimates  and  assumptions
     relating to the reporting of assets and  liabilities  and the disclosure of
     contingent  assets and  liabilities in connection  with the  preparation of
     these financial statements in conformity with generally accepted accounting
     principles. Actual results could differ from those estimates.

     Concentration of Customer and Credit Risks
     ------------------------------------------

     The Company's  customers are comprised of subscribers which utilize airtime
     services  and  purchase  related  equipment.  Financial  instruments  which
     potentially  subject the Company to  concentrations  of credit risk consist
     principally of accounts receivable.  As of December 31, 1996 and 1997 three
     and five customers' account balances  individually  accounted for more than
     5% of the  Company's  accounts  receivable  balance,  respectively.  In the
     aggregate those customers  accounted for 42% and 63%, of the total accounts
     receivable balance as of December 31, 1996 and 1997, respectively.  For the
     years  ended   December  31,  1996  and  1997,   four  and  five  customers
     individually   accounted  for  more  than  5%  of  the   Company's   sales,
     respectively.  In the aggregate,  these customers accounted for 62% and 69%
     of  total  sales  for  the  years  ended   December   31,  1996  and  1997,
     respectively.

     Accounts  receivable  are  generally  unsecured;  management  believes  its
     allowance for doubtful accounts is adequate to cover any exposure to loss.

     Concentration of Suppliers
     --------------------------

     The Company  currently  purchases  all of its base  station  equipment,  an
     important component of its network,  from its Parent.  Although there are a
     limited number of  manufacturers of this particular  equipment,  management
     believes that other suppliers could provide similar equipment on comparable
     terms. A change in suppliers,  however,  could cause a delay in procurement
     or  deployment  of  equipment  and a possible  reduction  in the quality of
     service, which could affect operating results adversely.

     The Company  currently leases  approximately  one-third of its transmission
     sites,  an  important  component  of its  network,  from its  Parent  under
     cancelable operating lease agreements.  Although there are a limited number
     of lessors of transmission  sites,  management  believes that other lessors
     could provide  acceptable  sites on comparable  terms. A change in lessors,
     however,  could cause a possible reduction in the quality of service, which
     could affect operating results adversely.

     Fair Value of Financial Instruments
     -----------------------------------

     Financial instruments, including accounts receivable, accounts payable, and
     accrued  liabilities  are  reflected in the  financial  statements  at fair
     value.  The fair values of all financial  instruments  were not  materially
     different from their carrying or contract values.


 (4) Liquidity
     -------    

     Operations for the current and prior year did not generate  sufficient cash
     flow to cover current  obligations.  The Parent has funded such obligations
     and has made a commitment  to continue to provide  financing to the Company
    
         


<PAGE>

     until the transaction  described in Note (12) is consummated.  The Parent's
     plans include the planned sale of the Company in exchange for consideration
     expected to include a combination  of cash and  securities of the acquirer.
     See Note (12) for a description of this pending transaction.


(5)  Property and Equipment
     ----------------------

     Property and  equipment  as of December  31, 1996 and 1997  consists of the
     following:
<TABLE>
<CAPTION>

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

                                       1996               1997
- --------------------------------------------------------------------------------
<S>                                  <C>                 <C>    
Network equipment                    $84,868             $86,765
Construction in progress               5,830               3,836
Personal terminals                     5,703               5,826
Computer equipment                    20,258              21,263
Leasehold improvements-building        3,255               3,268
Furniture and fixtures                 3,458               3,601
- --------------------------------------------------------------------------------
                                     123,372             124,559
Less accumulated depreciation         70,070              82,758
- --------------------------------------------------------------------------------
                                     $53,302             $41,801
- --------------------------------------------------------------------------------
</TABLE>


(6)      Intangible Assets

         Intangible  assets  consist of the  following  at December 31, 1996 and
1997:
<TABLE>


<CAPTION>
                                                        1996         1997

<S>                                                   <C>         <C>     
Excess cost over fair value of assets acquired        $ 12,966    $ 12,966
FCC licenses                                             7,462       7,767
                                                        20,428      20,773

Less accumulated amortization                            4,125       6,166

                                                      $ 16,303    $ 14,567
</TABLE>

FCC  licenses  as of December 31, 1996 and 1997  consists of certain FCC license
rights to 800 MHz channel  frequencies,  for which an  agreement  exists to sell
these license rights to third parties.  The agreement  contains three  traunches
which  provide  that a total of  eighty-four  frequencies  will be sold in three
separate  transactions.  The first  transaction,  is expected to be  consummated
during the first  quarter of 1998,  and will result in proceeds to the Parent of
$5,141. A cash deposit was received during December, 1997 and is reflected as an
advance  deposit at December 31,  1997.  The second and third  transactions  are
expected  to be  consummated  during  the last  half of 1998 and will  result in
proceeds of $976 to the Company.  The  carrying  value of these  frequencies  is
$3,170 and $3,022 at December 31, 1996 and 1997, respectively. The completion of
these transactions is dependent on obtaining FCC regulatory approval.






<PAGE>



(7)  Related Party Transactions
     --------------------------

     The Company engages in transactions with its Parent in the normal course of
     its business.  These  transactions  include purchases of services,  network
     hardware and software maintenance  services,  facility rentals, and network
     gateway fees, among various other transactions as follows:

     The Parent owns certain structures and equipment used by the Company in its
     operations under operating lease arrangements. Related rental expenses were
     approximately  $2,500,  $2,700, and $2,700 for the years ended December 31,
     1995, 1996, and 1997, respectively.

     The Parent  provides  maintenance  services  under service  contracts.  The
     Company incurred related expenses of $4,735,  $4,513,  and $4,830,  for the
     years ended December 31, 1995, 1996, and 1997, respectively.

     Network equipment is purchased from the Parent. Purchases aggregated $1,021
     and $290 for the years ended December 31, 1996 and 1997, respectively.

     Inventory is purchased  from the Parent.  Purchases  aggregated  $3,066 and
     $880 for the years ended December 31, 1996 and 1997, respectively.

     The Parent charges  certain  payroll and other  consulting  expenses to the
     Company.  Charges  aggregated  $3,234,  $649,  and $60 for the years  ended
     December 31, 1995, 1996, and 1997, respectively.

     During 1995 the Company  expensed  $1,727 in amounts paid to Parent,  which
     were to entitle  the  Company to  participate  in a contract to provide its
     services to customers  through  another  third  party.  The  agreement  was
     terminated during 1997.

     In management's opinion, the foregoing  transactions were consummated based
     on amounts agreed upon between the respective  parties and are  reasonable.
     However,  the amounts  disclosed  may not  represent the amounts that would
     have been  reported had these  transactions  occurred with third parties at
     "arms-length."


(8)  Leases
     ------

     Capital Leases
     --------------

     The Company is obligated  under a capital lease for equipment  that expires
     on  December  31,  2000.   The  gross  amounts  of  equipment  and  related
     accumulated  depreciation  recorded  under capital lease was as follows for
     December 31, 1996 and 1997:

     ---------------------------------------------------------------------------
                                              1996                1997
     ---------------------------------------------------------------------------

         Network equipment                  $18,831              18,831
         Less accumulated depreciation        5,136               8,560
     ---------------------------------------------------------------------------
                                            $13,695             $10,271
     ---------------------------------------------------------------------------
     
     Depreciation  of assets  held  under the  capital  lease is  included  with
     depreciation expense.

     The  Company's  obligations  require  monthly  payments in varying  amounts
     through  December 31, 2000. The obligations have been discounted to reflect
     an implicit interest rates 9.381%.



<PAGE>



     At December 31, 1997,  future  minimum lease  commitment  together with the
     present  value of  obligations  under lease that have  initial or remaining
     noncancelable terms in excess of one year were as follows:

     ---------------------------------------------------------------------------
         Period ended December 31,
     ---------------------------------------------------------------------------
         1998                                                       $4,896
         1999                                                        4,896
         2000                                                        4,896

     ---------------------------------------------------------------------------
         Total minimum lease payments                               14,688
         Less amount representing                                    1,857
     ---------------------------------------------------------------------------
         Present value of minimum lease payments                    12,831
         Less current portion of capital lease obligations           3,900
     ---------------------------------------------------------------------------
         Noncurrent portion of capital lease obligations            $8,931
     ---------------------------------------------------------------------------

     Operating Leases
     ----------------

     The Company  leases  substantially  all of its base station  sites  through
     cancelable  operating  leases.  The  majority of these  leases  provide for
     renewal  options for various periods at their fair rental value at the time
     of  renewal.  In the  normal  course  of  business,  operating  leases  are
     generally renewed or replaced by other leases.

     In addition,  the Company leases  certain office space and computers  under
     non-cancelable  operating leases.  Future minimum lease payments under such
     leases as of  December  31, 1997 for each of the next four years and in the
     aggregate are as follows:

     ---------------------------------------------------------------------------
         1998                                                        $1,340
         1999                                                         1,378
         2000                                                         1,416
         2001                                                            38
     ---------------------------------------------------------------------------
         Total lease obligations                                     $4,172
     ---------------------------------------------------------------------------
         Rent expense under all lease  agreements for the years ended December
         31, 1995, 1996, and 1997 was $7,791, $8,044, and $8,440, respectively.



(9)  Employee Benefits
     -----------------

     The Company maintains an Individual Accumulation Plan to provide retirement
     assistance to all eligible employees.  The plan consists of two components,
     a defined contribution plan and an employee savings plan. Under the defined
     contribution  plan,  the  Company  will  contribute  5% of each  employee's
     compensation to the plan. The employee savings plan allows  participants to
     contribute up to 12% of their  compensation  as an elective  deferral.  The
     Company  matches  these   contributions  up  to  4%  of  the  participant's
     compensation.  Company contributions under both plans were $1,382,  $1,409,
     and  $1,103,  for the  years  ended  December  31,  1995,  1996,  and 1997,
     respectively.   Participant   contributions   are   vested  at  all  times.
     Contributions made by the Company to all participants commencing employment
     prior to or on April 30, 1990 are fully vested.  Contributions  made by the
     Company to all participants commencing employment after April 30, 1990 vest
     over three years.





<PAGE>

(10) Income Taxes
     ------------

<TABLE>

     Income tax benefit for the years ended  December 31, 1995,  1996,  and 1997
     consists of:

<CAPTION>

     ---------------------------------------------------------------------------
                                            Current      Deferred       Total
     ---------------------------------------------------------------------------
<S>                                       <C>            <C>         <C>      
         Year ended December 31, 1995:
           U.S. Federal                   $(14,950)      $ 2,123     $(12,827)
           State and local                  (3,215)          456       (2,759)
     ---------------------------------------------------------------------------

                                          $(18,165)      $ 2,579     $(15,586)
     ---------------------------------------------------------------------------

         Year ended December 31, 1996:
            U.S. Federal                   (11,094)        1,606       (9,488)
            State and local                 (2,386)          346       (2,040)
     ---------------------------------------------------------------------------
                                                                  
                                          $(13,480)      $ 1,952     $(11,528)
     ---------------------------------------------------------------------------

         Year ended December 31, 1997:
            U.S. Federal                    (8,061)        2,459       (5,602)
            State and local                 (1,734)          529       (1,205)
     ---------------------------------------------------------------------------

                                          $ (9,795)      $ 2,988     $ (6,807)

     ---------------------------------------------------------------------------
</TABLE>



<TABLE>

     Income tax benefit  differed from the amounts computed by applying the U.S.
     Federal  income tax rate of 35% to losses  before  income tax  expense as a
     result of the following:

<CAPTION>

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


<S>                                                                  <C>          <C>         <C>     
         Computed "expected" tax benefit                             $(14,294)    $(10,684)   $(6,492)
         Increase (decrease) in tax benefit resulting from:
           Amortization of goodwill                                       454          454        454
           State and local income taxes, net of federal benefit        (1,793)      (1,327)      (783)
           Other                                                           47           29         14
     ---------------------------------------------------------------------------------------------------
                                                                     $(15,586)    $(11,528)   $(6,807)
     ---------------------------------------------------------------------------------------------------
</TABLE>




         The tax effects of temporary differences that give rise to  significant
         portions of the deferred  tax  assets  and  liabilities at December 31,
         1996 and 1997 are presented below:
<TABLE>
<CAPTION>
     ---------------------------------------------------------------------------
                                                    1996            1997
     ---------------------------------------------------------------------------
<S>                                                <C>            <C>    
         Deferred tax assets:
           Intangible assets, principally due
             to differences in amortization         $1,789        $ 1,162
         Accruals not deductible for tax purposes    3,096          1,514
             Employee benefits, principally
             due to accrual for financial 
             reporting purposes                        370             32
         Other                                         (16)         1,425
     ---------------------------------------------------------------------------
         Net deferred tax assets                     5,239          4,133
     ---------------------------------------------------------------------------

         Deferred tax liabilities:
            Property and equipment, principally 
             due to differences in depreciation     (6,770)        (8,588)
     ---------------------------------------------------------------------------
         Net deferred tax liabilities               (6,770)        (8,588)
     ---------------------------------------------------------------------------
         Net deferred tax asset (liability)        $(1,531)       $(4,455)
     ---------------------------------------------------------------------------
</TABLE>

<PAGE>

         At December 31, 1996  and  1997,  $(1,531) and $(4,455),  respectively,
         of cumulative  deferred taxes have been settled  through  stockholders'
         equity.  At December  31, 1996 and 1997,  the basis of excess cost over
         fair value of assets acquired for financial reporting  purposes exceeds
         the basis for tax purposes by $(253) and $(168), respectively.


(11) Commitments and Contingencies
     -----------------------------

     The  Company  is  obligated  under  the  terms  of a  take-or-pay  supplier
     agreement  entered  into in January,  1997 to purchase  prior to August 31,
     1998, a minimum of $2,375 of product. The agreement requires the Company to
     pay certain  additional  amounts if the Company or certain of its customers
     does not  purchase  a total of $9,500 of product  by August  31,  1998.  At
     December  31, 1997 the Company had  purchased a total of $774.  The Company
     believes  that  it  will  fulfill  its  obligations  under  the  agreement;
     accordingly,  no amount  has been  accrued  at  December  31,  1997 for the
     Company's obligation under the agreement.

(12) Stock Purchase Agreement
     ------------------------

     In  December  1997  the  Parent  entered  into a Stock  Purchase  Agreement
     (Agreement)  with  American  Mobile  Satellite   Communications  (AMSC)  to
     transfer  ownership  of the stock of MAA and MAI in  exchange  for cash and
     shares of AMSC common stock. In connection  with this Agreement,  the value
     exchanged  between  the Parent and AMSC is  subject  to  adjustment  to the
     extent  that  the  working  capital  of  the  Company,  as  defined  in the
     Agreement,  differs  from  the  amount  stipulated  in the  Agreement.  The
     transaction is designed as a tax-free exchange to the Parent and AMSC.

     Closing of the Agreement is subject to a number of significant  conditions,
     including,  among others,  the receipt of approval from the FCC, the filing
     of all  necessary  reports and  documents  with the  Department  of Justice
     pursuant to the Hart-Scott-Rodino  Anti-Trust  Improvements Act of 1976 and
     the expiration or termination of all applicable waiting periods thereunder,
     other  governmental  approvals,  and  the  satisfaction  of  certain  other
     conditions.  The Parent has the right to  terminate  this  Agreement if the
     market  value of AMSC common  stock  calculated  as of the closing date has
     declined by more than 30% from the market value  calculated  as of the date
     of the Agreement.






                                                                  EXHIBIT 99(18)


                      AMERICAN MOBILE SATELLITE CORPORATION
            UNAUDITED PRO FORMA CONSOLIDATED CONDENSED BALANCE SHEET

<TABLE>
<CAPTION>

                                                                                   As of December 31, 1997
                                                                                   -----------------------

                                                                                         Pro Forma              Pro Forma
                                                                                         ---------              ---------
                                                              AMSC      ARDIS            Adjustment             Consolidated
                                                              ----      -----            ----------             ------------
                                                                                   Acquisition     Offering
                                                                                   -----------     --------
                                                                                   (Dollars in thousands)

Assets:
Current Assets:
<S>                                                        <C>        <C>          <C>              <C>            <C>     
 Cash and cash equivalents                                 $  2,106   $ 2,082      $(2,082)(2)      $24,100 (1)    $ 26,206
 Inventory                                                   40,321       342                                        40,663
 Accounts receivable-trade, net of allowance for doubtful
     accounts                                                 8,140     7,642          (92)(4)                       15,690
 Pledged Securities                                              --        --                        41,037 (1)      41,037 
 Other current assets                                        14,172     3,179                         5,967 (1)      23,318 
                                                           --------    ------                                       -------
     Total current assets                                    64,739    13,245                                       146,914    
Property and equipment, net                                 233,174    41,801                                       274,975   
Goodwill                                                         --        --       68,557 (2)                       71,107
                                                                                     2,550 (1)(2)
Deferred charges and other assets, net                       13,534    14,784      (14,567)(2)       12,250 (1)      37,934
                                                                                                     11,933 (1)
Pledged Securities                                               --        --       10,000 (1)       71,963 (1)      81,963
                                                           --------   -------                                       -------
     Total assets                                          $311,447   $69,830                                      $612,893
                                                           ========   =======                                      ========
Liabilities and Stockholders' Equity
Current liabilities:
 Accounts payable and accrued expenses                     $ 35,861   $ 8,907      $   (92)(4)      $(2,200)       $ 42,476
 Current portion of obligations under capital leases            798     3,900                                         4,698
 Current portion of long-term debt                           15,254        --                        (5,000)(1)      10,254
 Other current liabilities                                    7,520        --                                         7,520
                                                           --------   -------                                      --------
      Total current liabilities                              59,433    12,807                                        64,948
Long-term liabilities:
 Obligations under Bank Facility                            198,000        --                       (98,000)(1)     100,000(1)
 12 1/4% Senior Notes                                            --        --                       326,500 (1)     326,500
 Capital lease obligations                                    3,147     8,931                                        12,078
 Fair value of assets acquired in excess of purchase price    2,725        --                                         2,725
 Other long-term debt                                         1,364        --                                         1,364
 Other long-term liabilities                                    647        --                                           647
                                                           --------   -------                                       --------
       Total long-term liabilities                          205,883     8,931                                       443,314
                                                           --------   -------                                       -------
           Total liabilities                                265,316    21,738                                       508,262
 Stockholders' equity:
  Net Assets of ARDIS                                                  48,092      (48,092)(2)                           --  
  Preferred Stock, par value $0.01: authorized 200,000
       shares; no shares issued                                  --        --                                            --
  Common Stock, voting, par value $0.01: authorized
       75,000,000 shares                                        252        --                            63 (2)         315
  Additional paid-in capital                                451,892        --                        47,747 (2)     499,639
  Common Stock purchase warrants                             36,338        --                         2,190 (2)      64,748
                                                                                                      8,500 (1)
                                                                                                     17,720 (3)
  Unamortized Guarantee Warrants                            (23,586)       --                       (17,720)(3)     (41,306)
  Retained loss                                            (418,765)       --                                      (418,765)
                                                           ---------  -------                                      ---------
        Total stockholders' equity                           46,131    48,092                                       104,631 
                                                           ---------  -------                                      ---------
        Total liabilities and stockholders' equity         $311,447   $69,830                                      $612,893 
                                                           =========  =======                                      ========

 See Notes to Pro Forma Financial Information on following pages.
</TABLE>


<PAGE>




                      AMERICAN MOBILE SATELLITE CORPORATION
              UNAUDITED PRO FORMA CONSOLIDATED STATEMENT OF INCOME

<TABLE>
<CAPTION>

                                                                          Year Ended December 31, 1997
                                                                          ----------------------------
                                                                                   Pro Forma Adjustments           Pro Forma
                                                                                   ---------------------           ---------
                                                            AMSC        ARDIS     Acquisition      Offering       Consolidated
                                                            ----        -----     -----------      --------       ------------
                                                                  (Dollars in thousands, except per share data)

Revenues:
<S>                                                      <C>          <C>          <C>             <C>          <C>     
    Services                                             $ 20,684     $41,923      $ (498)(9)                   $ 62,109
    Equipment and consulting                               23,530       2,326                                     25,856
                                                         --------     -------                                   --------
      Total revenue                                        44,214      44,249                                     87,965
Cost of service and operations                             31,959      31,940        (498)(9)                     63,401
Cost of equipment sold                                     40,335       2,233                                     42,568
Sales and advertising                                      12,066       5,888                                     17,954
General and administrative                                 14,819       6,970                                     21,789
Depreciation and amortization                              42,430      14,586      (1,297)(5)                     59,274
                                                                                    3,555 (6)
                                                         --------     -------                                   --------
                                                                                    
Operating loss                                            (97,395)    (17,368)                                  (117,021)
Interest and other (expense)  income                         (179)        150         500 (8)        5,208 (10)    5,679
Interest expense                                          (21,633)     (1,331)                     (42,076)(7)   (65,040)
                                                         ---------    --------                                  --------

Net loss before income tax benefit                       (119,207)    (18,549)                                  (176,382)
Income tax benefit                                             --       6,807      (6,807)(12)                        -- 
                                                         ---------    -------                                  ----------
Net loss                                                $(119,207)   $(11,742)                                 $(176,382)
                                                         =========   =========                                 ==========
Loss per share of Common Stock                          $   (4.74)                                             $   (5.62)
                                                         =========                                             ==========
Weighted-average common shares outstanding
    during the period (000's)                              25,131                   6,262(11)                     31,393
                                                         =========                =======                      ==========



See Notes to Pro Forma Financial Information on following pages.
</TABLE>



<PAGE>




                    NOTES TO PRO FORMA FINANCIAL INFORMATION

The pro forma  financial  information is based on the following  assumptions and
adjustments:

(1) Reflects the $335.0 million in total  proceeds from the Offering  (comprised
of $326.5  million of proceeds  from the  issuance of Notes and $8.5  million of
proceeds  from the issuance of the  Warrants)  and  application  of the proceeds
therefrom as if the Offering,  the  Acquisition  and the New Bank  Financing had
occurred on December 31, 1997, as follows:

<TABLE>
<CAPTION>

                                                                   Amount
                                                                   ------
                                                                (Dollars in
                                                                 thousands)
                                                                 ----------
<S>                                                               <C>     
     Purchase of Pledged Securities                               $113,000
     Cash portion of the Acquisition                                50,000
     Cash escrow for UPS Guarantee                                  10,000
     Repayment of Bank Financing of American Mobile                 98,000 (a)
     Pre-funding of three years of interest on the Term Loan        17,900
     Facility
     Repayment of other deferred obligations                         7,200 (b)
     Payment of acquisition and financing costs                     14,800 (c)
     Working capital                                                24,100 (d)
                                                                   -------
        Gross proceeds from the sale of the Units                 $335,000
                                                                  ========
</TABLE>

     (a) Reflects $98.0 million  repayment of the Bank Financing  outstanding at
     December 31, 1997.  It is expected  that the Company will have the ability,
     subject to certain conditions, to borrow $100.0 million under the Revolving
     Credit Facility.

     (b)  Consists  of $2.2  million of  accrued  expenses  and $5.0  million of
     deferred vendor financing. 

     (c)  Consists  of $12.2  million  of  financing  costs and $2.6  million of
     acquisition  costs.  

     (d) Subsequent to December 31, 1997, American Mobile incurred $12.0 million
     of additional  debt prior to the Offering.  Proceeds from the Offering,  in
     the amount of $10.1  million,  will be used to repay the Bridge  Financing,
     including  accrued  interest thereon and $2.0 million will be used to repay
     additional borrowing made on the Bank Facility.

(2)  Reflects  the  Acquisition.  All share and  warrant  amounts  assume  final
shareholder  approval for the issuance of $50.0  million in shares and warrants.
No  assumptions  have been made  regarding  any purchase  price  adjustments  as
outlined in the ARDIS Acquisition Agreement.


Total acquisition costs are anticipated to be as follows:

<TABLE>
<CAPTION>
(Dollars in thousands)                                                                      Amount
- ----------------------                                                                      ------
<S>                                                                                       <C>  
6,262,000 shares of American Mobile Satellite Corporation at $7.63 per share (average
      of closing price 20 days prior to acquisition agreement) issued to Motorola         $ 47,810
287,000 warrants of American Mobile Satellite Corporation at a strike price of
      $.01--valued at $7.63 per share issued to Motorola                                     2,190
Cash payment to Motorola                                                                    50,000
Estimated transaction costs                                                                  2,550
                                                                                          --------
                                                                                          $102,550
                                                                                          ========
</TABLE>


<PAGE>




The anticipated  acquisition costs have been allocated for pro forma purposes as
follows:

<TABLE>
<CAPTION>

    (Dollars in thousands)                                               Amount
                                                                         ------
<S>                                                                      <C>     
    Current assets                                                       $ 11,163
    Equipment and fixtures, net                                            41,801
    Other assets, net                                                         217
    Excess of purchase price over fair market value                        71,107
    Accounts payable, accrued expenses and other liabilities               (8,907)
    Capital leases                                                        (12,831)
                                                                         ---------
                                                                         $102,550
</TABLE>

The above  allocation of acquisition  costs is  preliminary  and may change upon
final  determination of the fair value of assets  acquired.  The Company has not
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 and utilized in the pro forma financial  information  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.

(3)  Reflects  the  re-pricing  and  extension  of life of 5.5 million  existing
Guarantee Warrants and issuance of 1.0 million additional  Guarantee Warrants in
connection with the restructuring of the Bank Facility. The existing 5.5 million
Guarantee  Warrants will be extended an  additional  3.75 years and the exercise
price will be changed to reflect a 10% premium over AMSC's  closing Common Stock
price  on the  date of  closing  of the  Offering.  The  exercise  price  of the
Guarantee  Warrants is $12.51,  a 10% premium over AMSC's  Common Stock price on
March 25, 1998.  The 1.0 million  additional  Guarantee  Warrants will be issued
with a seven-year life and exercise price equal to the new exercise price of the
existing  5.5  million  Guarantee  Warrants.  The  Guarantee  Warrants  will  be
amortized over five years (the life of the guarantee) to interest expense.

(4)  Reflects  the  elimination  of   inter-company   balances   resulting  from
transactions between American Mobile and ARDIS.

(5) Reflects the elimination of goodwill amortization recorded by ARDIS.

(6) Reflects the  amortization,  over a 20-year  life, of the excess of purchase
price of ARDIS over fair market value of assets acquired.


(7) Reflects adjustments to interest expense as follows:

<TABLE>
<CAPTION>
                                                                                  Year Ended
                                                                                 December 31,
                                                                                     1997
                                                                                 ------------

     (Dollars in thousands)

<S>                                                                               <C>      
         (a)  Adjustment of interest expense and debt costs on New Bank           $(10,548)
              Financing
         (b)  Interest expense on the Notes and amortization of debt discount        41,888
         (c)  Amortization of Note issuance costs                                     1,225
         (d)  Amortization of Guarantee Warrants and debt issuance costs              3,544
         (e)  Amortization of pre-funded interest                                     5,967
                                                                                  ---------
                                                                                  $  42,076
                                                                                  =========
</TABLE>

     The  assumptions in connection  with the above pro forma  interest  expense
     adjustments are as follows:

     (a) Reflects the  elimination  of interest  expense  applicable to the Bank
     Financing  and vendor  financing  which is to be partially  repaid with the
     proceeds from the sale of the Units.

     (b) Reflects  interest  expense on the Notes at 12 1/4% and amortization of
     the $8.5 million debt discount.

     (c) Reflects the  amortization,  over a ten year period,  of debt  issuance
     costs of approximately  $12.2 million  associated with the Offering and the
     New Bank Financing.

     (d) Reflects the  amortization,  over a five year period,  of the Guarantee
     Warrants and the amortization of capitalized  costs related to the New Bank
     Financing.


<PAGE>



     (e) Reflects the interest expense on the New Bank Financing.

(8) Reflects  interest  earned on funds  escrowed in connection  with a customer
guarantee at an average interest rate of 5.0%.

(9)  Reflects the  elimination  of revenues  and related  operating  expenses on
transactions between American Mobile and ARDIS.

(10) Reflects  interest  income  earned on the Pledged  Securities at an average
interest rate of 5.0%.

(11) Reflects shares issued to Motorola in connection with the Acquisition.

(12) Reflects the  elimination  of a tax sharing  arrangement  between ARDIS and
Motorola.



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