AMERICAN MOBILE SATELLITE CORP
DEF 14A, 1998-04-27
COMMUNICATIONS SERVICES, NEC
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


I.   SCHEDULE 14A INFORMATION

     A. Proxy Statement Pursuant to Section 14(a) of the Securities Exchange
        Act of 1934


Filed by the Registrant |X|
Filed by a Party other than the Registrant |_|

Check the appropriate box:

| |  Preliminary Proxy Statement
|_|  Confidential,  for  Use  of the  Commission  Only  (as  permitted  by  Rule
     14a-6(e)(2)) 
|X| Definitive Proxy Statement 
|_| Definitive  Additional Materials
|_| Soliciting Material Pursuant to ss. 240.14a-11(c) or ss. 240.14a-12


                      American Mobile Satellite Corporation
                (Name of Registrant as Specified in Its Charter)

                                 Randy S. Segal
                   (Name of Person(s) Filing Proxy Statement)


Payment of Filing Fee (Check the appropriate box):

|X| No fee required.

|_| Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

1)   Title of each class of securities to which transaction  applies: 
2)   Aggregate number of securities to which transaction applies:
3)   Per unit price or other underlying value of transaction  computed  pursuant
     to Exchange  Act Rule O-11 (Set forth the amount on which the filing fee is
     calculated and state how it was determined):
4)   Proposed maximum aggregate value of transaction: 
5)   Total fee paid:


     |_| Fee paid previously with preliminary materials.
     |_| Check box if any part of the fee is offset as provided by Exchange  Act
         Rule  0-11(a)(2)  and identify the filing for which the  offsetting fee
         was paid  previously.  Identify  the  previous  filing by  registration
         statement number, or the Form or Schedule and the date of its filing.

         1)   Amount Previously Paid:
         2)   Form Schedule or Registration Statement No.:
         3)   Filing Party:
         4)   Date Filed:






<PAGE>



[GRAPHIC OMITTED]




American Mobile Satellite Corporation
10802 Parkridge Boulevard
Reston, Virginia  20191-5416




Dear Stockholder:

You are  cordially  invited  to attend the annual  meeting  of  stockholders  of
American Mobile Satellite Corporation to be held at 9:00 a.m. on Wednesday,  May
20, 1998 at the Sheraton  Reston  Hotel,  11810 Sunrise  Valley  Drive,  Reston,
Virginia (703/620-9000).

The formal  notice of annual  meeting and proxy  statement  are attached to this
letter.  This  material  contains  information  concerning  the  business  to be
conducted at the meeting and the nominees for election as directors.

Even if you are unable to attend the  meeting in person,  it is  important  that
your shares be represented.  Therefore,  I urge you to complete,  date, sign and
return the enclosed  proxy card at your earliest  convenience.  If you choose to
attend the annual meeting,  you may, of course,  revoke your proxy and cast your
votes personally at the meeting.

                                   Sincerely,
                                   /s/Gary M. Parsons
                                   Chairman of the Board



<PAGE>



[GRAPHIC OMITTED]





American Mobile Satellite Corporation
10802 Parkridge Boulevard
Reston, Virginia  20191-5416


NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To the Stockholders of American Mobile Satellite Corporation:

The annual meeting of  stockholders  of American  Mobile  Satellite  Corporation
("American  Mobile" or the "Company") will be held at the Sheraton Reston Hotel,
11810 Sunrise Valley Drive,  Reston,  Virginia,  on Wednesday,  May 20, 1998, at
9:00 a.m., for the following purposes:

         1. To elect ten directors;

         2. To  consider  and act upon a proposal to ratify the  appointment  of
Arthur Andersen LLP as independent  accountants for American Mobile for the year
1998;

         3. To approve an amendment to American  Mobile's 1989 Stock Option Plan
to increase the number of shares authorized for issue;

         4. To  consider  and act upon a proposal  to issue  shares of  American
Mobile  Common  Stock and warrants to purchase  Common  Stock to Motorola,  Inc.
("Motorola") in connection with American Mobile's acquisition of ARDIS; and

         5. To transact such other  business as may be properly  brought  before
the meeting or any adjournments thereof.

Only  holders  of  record  of  American  Mobile's  Common  Stock at the close of
business on March 31, 1998,  will be entitled to vote at the meeting.  A list of
such  stockholders  will  be  available  at the  Company's  headquarters,  10802
Parkridge  Boulevard,  Reston,  Virginia for examination  during normal business
hours by any  stockholder for any purpose germane to the meeting for a period of
ten days prior to the meeting.

Stockholders  who do not  expect to attend  the  meeting  in person are asked to
date,  sign and complete the enclosed  proxy and return it without  delay in the
enclosed envelope, which requires no postage if mailed in the United States.

                          By order of the Board of Directors,
                          Randy S. Segal
                          Vice President and Secretary

Reston, Virginia
April 27, 1998



<PAGE>



[GRAPHIC OMITTED]





American Mobile Satellite Corporation
10802 Parkridge Boulevard
Reston, Virginia  20191-5416

                                 PROXY STATEMENT

The  accompanying  proxy is  solicited  on behalf of the Board of  Directors  of
American Mobile Satellite  Corporation  ("American Mobile" or the "Company") for
use at the annual  meeting of  stockholders  to be held on May 20, 1998, and any
adjournments thereof. The stockholder giving the proxy may revoke it at any time
before it is exercised at the meeting by delivering to the Secretary of American
Mobile a written  instrument of  revocation  or a duly executed  proxy bearing a
later date.  This proxy statement and the  accompanying  form of proxy are being
first sent to stockholders on or about April 27, 1998.

The only class of  securities  of American  Mobile  entitled to vote at the 1998
annual meeting is its Common Stock, of which 30,201,726  shares were outstanding
on March 31, 1998. Only stockholders of record at the close of business on March
31, 1998, will be entitled to vote at the annual meeting.  Each  stockholder has
one vote for each share of Common  Stock held,  and in the election of directors
is  entitled  to  cumulate  his or her  votes.  Under  cumulative  voting,  each
stockholder  is allowed  that  number of votes  equal to the number of  director
positions to be filled (ten)  multiplied by the number of shares of Common Stock
owned.  The stockholder may distribute those votes among one or more, or all, of
the  nominees as the  stockholder  desires.  However,  as described  below,  the
accompanying proxy reserves to the persons named therein the right to distribute
the votes represented by such proxy in their discretion in order to maximize the
likelihood of electing the full slate of  directors.  Under  cumulative  voting,
directors  are elected by a  plurality  of votes  cast.  A withheld  vote on any
nominee will not affect the voting results.

With respect to Proposal 2,  ratification  of the appointment of Arthur Andersen
LLP as  independent  accountants  for  American  Mobile for the year  1998,  and
Proposal 3,  approval of the  amendment to the 1989 Stock Option Plan (the "1989
Plan")  will in each case  require  the  affirmative  vote of a majority  of the
shares  present  in person or  represented  by proxy at the annual  meeting  and
entitled to vote.  Abstentions  will be treated as votes present and entitled to
vote and thus will have the effect of a vote against the proposal.  With respect
to Proposal 4,  approval of issuance of shares of Common  Stock and  warrants to
purchase  Common Stock to Motorola,  the  affirmative  vote of a majority of the
shares  present  in person  or  presented  by proxy at the  annual  meeting  and
entitled to vote,  without  reference to the shares  currently held by Motorola,
will be required.  Abstentions  (other than that of Motorola) will be treated as
votes  present  and  entitled  to vote and thus will  have the  effect as a vote
against the proposal.

Brokers  who hold  shares in street  name do not have the  authority  to vote on
certain  matters for which they have not received  instructions  from beneficial
owners.  Such  broker  non-votes  (arising  from the lack of  instructions  from
beneficial owners) will not affect the outcome of the vote on Proposals 2, 3 and
4. Broker non-votes will be counted in determining the existence of a quorum.

                                        1

<PAGE>



The cost of soliciting  proxies in the form  enclosed  herewith will be borne by
the Company.  In addition to the  solicitation  of proxies by mail, the Company,
through its directors,  officers and regular employees, may also solicit proxies
personally or by  telephone.  The Company also will request  persons,  firms and
corporations  holding  Common  Stock  in their  names  or in the  names of their
nominees,  which are beneficially owned by others, to send proxy material to and
obtain  proxies from the  beneficial  owners and will  reimburse the holders for
their reasonable expenses in so doing.


                            1. ELECTION OF DIRECTORS

It is  intended  that the  persons  named in the proxy  will,  unless  otherwise
instructed,  vote for the election of the ten nominees  listed below to serve as
directors  until  the next  annual  meeting  of  stockholders  and  until  their
respective  successors are elected and qualified.  If for any reason any nominee
should  not be  available  for  election  or able to  serve as a  director,  the
accompanying  proxy  may be  voted  for the  election  of a  substitute  nominee
designated  by the Board of Directors  and will be voted for the election of the
other nominees named therein. In any event, management reserves the right in its
discretion to distribute the total votes  represented by the proxies unevenly or
among less than all of the persons named (or their substitutes), as permitted by
cumulative  voting,  in order to maximize  the  likelihood  of electing the full
slate of directors.

Nominees
- --------

Information  with respect to the business  experience  and  affiliations  of the
nominees to the Board of Directors is set forth below. The information set forth
below and elsewhere in this proxy  statement  concerning  the nominees and their
security holdings has been furnished by them to American Mobile.

     Gary M. Parsons,  47. American  Mobile's Chairman of the Board of Directors
and Chief  Executive  Officer  effective  March  1998,  Mr.  Parsons has been an
American Mobile director,  the Chief Executive Officer and President of American
Mobile  since  July  1996.  Mr.  Parsons   joined   American   Mobile  from  MCI
Communications  Corporation  ("MCI")  where he served in a variety of  executive
roles from 1990 to 1996,  including most recently as Executive Vice President of
MCI Communications, and as Chief Executive Officer of MCI's subsidiary MCImetro,
Inc. From 1984 to 1990, Mr.  Parsons was one of the  principals of  Telecom*USA,
which was acquired by MCI.

     Douglas I. Brandon, 39. An American Mobile director as of January 1998, Mr.
Brandon is Vice President -- External Affairs & Law, AT&T Wireless Services, Inc
("AT&T  Wireless").  Prior to joining  AT&T  Wireless in 1993,  Mr.  Brandon was
associated with the law firm of Davis Polk & Wardwell  beginning in 1986.  Prior
to Davis Polk, Mr. Brandon  clerked for the Honorable  William H. Timbers of the
United States Court of Appeals for the Second Circuit.

     Ho Siaw Hong,  48. An American  Mobile  director  since April 1997 and from
March 1993 to March 1994,  Mr. Ho is Assistant  Vice  President of the Satellite
Services Group of Singapore Telecommunications Ltd. ("Singapore Telecom"). Since
1972 he has held a variety of  positions  at  Singapore  Telecom in the areas of
network control and  management,  cellular  radio,  paging and satellite  system
planning and satellite business development.


                                        2

<PAGE>



     Billy J.  Parrott,  62. An American  Mobile  director  since May 1988,  Mr.
Parrott  is  President  and  Chief  Executive  Officer  of  Antifire,   Inc.,  a
manufacturer of non-toxic fire  retardants.  Mr. Parrott is also the founder and
co-founder of several telecommunications companies,  including Private Networks,
Inc., a builder and operator of telecommunications and broadcast properties, and
Roanoke Valley Cellular Telephone Company,  a cellular  communications  company.
Mr.  Parrott is owner of a  production  company  where he functions as a writer,
producer, director and marketing consultant to Fortune 500 companies.

     Pradeep P. Kaul, 48. Mr. Kaul is Executive Vice President of Hughes Network
Systems  ("HNS"),  responsible  for HNS'  efforts in the  wireless  marketplace,
managing the  development  and  marketing of offerings  that include  subscriber
terminals,  infrastructure networks and digital network services. Prior to 1987,
Mr.  Kaul  was  senior  vice  president  of  M/A-Com  Telecommunications,   Inc.
("M/A-Com"),  which was acquired by Hughes Electronics Corporation ("Hughes") in
1987. Prior to that, Mr. Kaul was director of engineering with M/A Com.

     Andrew A.  Quartner,  44. An American  Mobile  director since May 1988, Mr.
Quartner also serves as corporate counsel at Nextlink  Communications,  Inc. and
Vice  Chairman of  CellPort  Labs,  Inc.  Prior to his  present  positions,  Mr.
Quartner was Senior Vice  President,  Law, of AT&T  Wireless  beginning in 1997,
which he joined in November 1985.  Prior to joining AT&T Wireless,  Mr. Quartner
was associated with the law firm of Debevoise & Plimpton in New York.

     Jack A. Shaw, 59. An American Mobile director and formerly  Chairman of the
Board of Directors of American  Mobile since July 1996, Mr. Shaw is Chairman and
Chief Executive Officer of HNS and Senior Vice President of Hughes.  Mr. Shaw is
a member of the Hughes  Executive  Committee.  Previously,  Mr. Shaw held senior
management  positions with companies including ITT Space  Communications,  Inc.,
Digital Communications Corporation, and M/A-Com, which was acquired by Hughes in
1987.

     Roderick M.  Sherwood,  III, 44. An American  Mobile  director  since April
1996, Mr. Sherwood is a Vice President of Hughes and Executive Vice President of
DIRECTV  International,  Inc.  Previously,  Mr.  Sherwood served as Treasurer of
Hughes,  Senior Vice  President --  Operations  and Chief  Financial  Officer of
Hughes  Telecommunications  and Space  Company,  Chairman  of Hughes  Investment
Management  Company,  and a member  of the  Hughes  Chairman's  Forum.  Prior to
joining Hughes in May 1995, Mr.  Sherwood served in a variety of financial roles
during  his  14-year  career  with  Chrysler  Corporation,  where he  served  as
assistant treasurer from 1991 to 1994.

     Michael T. Smith,  54. An American  Mobile  director  since April 1996, Mr.
Smith is Chairman and Chief Executive  Officer of Hughes.  Mr. Smith is a member
of the Hughes  Executive  Committee.  Prior to his current  position,  Mr. Smith
served as Chairman  of Hughes  Aircraft  Company  ("Hughes  Aircraft")  and Vice
Chairman of Hughes.  Mr.  Smith  served as Executive  Vice  President  and Chief
Financial  Officer of Hughes from 1989 until 1992. Mr. Smith was the Chairman of
Hughes Missile Systems Co. from 1992 to 1994. Previously,  Mr. Smith served in a
variety  of  financial  management  positions  with  Hughes and  General  Motors
Corporation, beginning his career in 1968.

     Yap Chee Keong,  37. An American Mobile director since May 1997, Mr. Yap is
the Group Financial Controller/Vice President for the Corporate Finance Group of
Singapore Telecom with overall  responsibility for the financial  management and
control of the Singapore  Telecom Group.  Prior to joining  Singapore Telecom in
1995, he was the General Manager and Group Financial Controller of United Pulp &
Paper Company Limited, and an Audit Manager of KPMG Peat Marwick LLP.

                                        3

<PAGE>



Board Committees, Meetings and Compensation
- -------------------------------------------

The Board of  Directors  has an  Executive  Committee  which meets as needed and
generally has full  authority to act on behalf of the Board of Directors  unless
otherwise   prohibited  by  Delaware  law.  The  Executive   Committee  includes
representatives  from Hughes,  AT&T  Wireless  and  Singapore  Telecom,  and its
members are designated by the Board of Directors in accordance with the terms of
a stockholders' agreement. Under certain circumstances,  a stockholder holding a
Threshold   Percentage  of  Common  Stock  has  the  right  to  cause  other  5%
stockholders  which are  parties to the  agreement  to have such other  parties'
representatives  on the  Board of  Directors  vote to have the  nominee  of that
stockholder  appointed  to  the  Executive  Committee.   See  "Agreements  Among
Stockholders." The current members of American Mobile's Executive  Committee are
Messrs.  Brandon,  Ho, Shaw,  Sherwood and Zesiger.  Mr. Albert Zesiger, a Board
member,  and a member of the  Executive  Committee  and  Compensation  and Stock
Option  Committee,  is not  standing  for  reelection  as a  Board  member.  See
"Compensation and Stock Option Committee Interlocks and Insider  Participation."
The  Executive  Committee met two times during 1997 and took action by unanimous
written consent one time during 1997.

The Board of Directors also has an Audit Committee  which currently  consists of
Messrs.  Yap,  Quartner,  and Sherwood.  The Audit  Committee is responsible for
reviewing the Company's internal auditing procedures and accounting controls and
will consider the selection and independence of the Company's outside auditors.
The Audit Committee met three times during 1997.

The Board of Directors has a Nominating  Committee  which makes  nominations for
the Board of Directors and the Committees of the Board.  The current  members of
the Nominating Committee are Messrs.  Dorfman,  Quartner,  and Smith. Mr. Steven
Dorfman,  a Board  member  and a  member  of the  Nominating  Committee,  is not
standing for  reelection as a Board member.  The  Nominating  Committee met once
during 1997. The Nominating  Committee  will consider  stockholder  proposals of
persons to be nominated  for election to the Board made in  accordance  with the
Company's Bylaws. See "Proposals for 1999," below.

The Board of Directors has a Compensation  and Stock Option  Committee  which is
responsible for administering  American Mobile's 1989 Plan, reviewing certain of
American Mobile's compensation programs and making  recommendations to the Board
of  Directors  with  respect  to  compensation.   The  current  members  of  the
Compensation  and Stock Option Committee are Messrs.  Quartner,  Shaw, Smith and
Zesiger.  The  Compensation  and Stock Option Committee met one time during 1997
and took  action by  unanimous  written  consent  five times  during  1997.  See
"Compensation and Stock Option Committee Report."

The Board of Directors met nine times during 1997.  All director  nominees other
than Messrs.  Sherwood  and Yap  attended 75% or more of all Board  meetings and
meetings of committees of which they were members during 1997.

Each  non-employee  member of the Board of  Directors  is entitled to receive an
annual  retainer of $19,000,  and each member of the  committees of the Board is
entitled to receive additional amounts as follows:  Executive Committee,  $3,500


                                        4

<PAGE>


per year; Audit Committee,  $2,500 per year;  Nominating  Committee,  $2,000 per
year; and Compensation and Stock Option  Committee,  $2,000 per year.  Directors
have the  right to elect to  retain or  forego  these  amounts,  or to have them
donated to a charity of their choice.  Mr. Parrott  elected to have such amounts
paid to him directly.  All other directors elected to forego receipt of retainer
and committee fees. Beginning in January 1998, Mr. Quartner elected to have such
amounts  paid  to  him  directly.   Directors  also  receive  reimbursement  for
reasonable  expenses  incurred in  attending  meetings of the Board and of Board
committees.  During 1997,  all directors  elected to forego such  reimbursement.
Each non-employee  member of the Board of Directors (an "Eligible  Director") is
entitled  to receive  options  exercisable  for the  Company's  Common  Stock as
provided  in  the  Company's  1994  Non-Employee   Director  Stock  Option  Plan
("Director Plan").  Pursuant to the Director Plan, each Eligible Director (other
than directors  electing not to receive such options) receives an initial option
to purchase 1,000 shares of Common Stock, and automatically receives annually an
option to purchase 500 shares of Common Stock at an exercise  price equal to the
fair market value of the Common Stock on the date of grant.  Each option expires
on the  earlier  of (i) ten (10)  years from the date of grant or (ii) seven (7)
months after a director's termination of service as a director. Messrs. Brandon,
Dorfman,  Ho,  Shaw,  Sherwood,  Smith,  Yap and Zesiger  have elected to forego
receipt of options under the Director Plan.



Security Ownership of Certain Beneficial Owners and Management
- --------------------------------------------------------------

The following  table and the  accompanying  notes set forth certain  information
concerning the beneficial  ownership of American  Mobile's Common Stock at March
31, 1998 (except where otherwise indicated),  by (i) each person who is known by
American Mobile to own beneficially  more than five percent of American Mobile's
Common Stock,  (ii) each  director,  (iii) each  Executive  Officer named in the
Summary Compensation Table (see "Executive  Compensation,"  below), and (iv) all
directors and Executive Officers as a group. Except as otherwise indicated, each
person listed in the table has informed American Mobile that such person has (i)
sole voting and investment  power with respect to such person's shares of Common
Stock and (ii) record and  beneficial  ownership  with respect to such  person's
shares of Common Stock.
<TABLE>
<CAPTION>

Name of Beneficial Owner(1)                 Number of
                                              Shares          % of Class
Beneficial Owners of More than 5%

<S>                                        <C>                <C>   
AT&T Wireless Services, Inc.(2)             3,881,424         12.48%
1150 Connecticut Avenue, N.W.
Washington, DC  20036

Singapore Telecommunications Limited (3)    4,919,046         15.86%
31 Exeter Road, Comcentre
Singapore 239732
Republic of Singapore

Motorola, Inc.(4)                           5,025,000         16.64%
1303 East Algonquin Road
Schaumberg, IL 60196

Baron Capital, Inc.(5)                      6,153,000         19.84%
767 Fifth Avenue, 24th Floor
New York, NY 10153

Hughes Communications Satellite
    Services, Inc.(6)                      11,566,622         32.92%
Building S66/D468
Post Office Box 92424
Los Angeles, CA  90009




                                       5
<PAGE>

Directors and Executive Officers

Douglas I. Brandon..................................0             *
Robert L. Goldsmith(7)(11)....................111,158             *
Ho Siaw Hong........................................0             *
Pradeep P. Kaul.....................................0             *
Billy J. Parrott(8)(9).........................12,000             *
Gary M. Parsons(7)(11)........................256,267             *
Stephen D. Peck(7) (11)........................30,218             *
Walter V. Purnell, Jr.(11)(12).................80,200             *
Andrew A. Quartner(8)(10).......................5,500             *
Jack A. Shaw........................................0             *
Roderick M. Sherwood III............................0             *
Michael T. Smith................................1,000             *
Yap Chee Keong......................................0             *
Randy S. Segal(7) (11)........................133,556             *
All Directors and Executive Officers as a
group (14 persons)(7)(11).....................629,899         2.09%
</TABLE>
* Less than 1%

     (1)Certain holders of Common Stock, including each of the beneficial owners
of more than 5% of the Common Stock ("5% Stockholders")  listed in the table are
parties to a stockholders'  agreement dated December 1, 1993 (the "Stockholders'
Agreement").  The 5% Stockholders who are parties to the Stockholders' Agreement
may be deemed to  constitute a group having  beneficial  ownership of all Common
Stock held by members of such group. See "Agreements Among  Stockholders."  Each
such 5% Stockholder  disclaims beneficial ownership as to shares of Common Stock
held by other 5% Stockholders.

     (2)Through its subsidiaries, Transit Communications, Inc. (681,818 shares),
Satellite  Communications  Investments Corporation (1,344,067 shares), and Space
Technologies  Investments,  Inc. (1,855,539).  Includes 649,347 shares of Common
Stock issuable upon exercise of warrants held by Space Technologies Investments,
Inc., and 230,932 shares of Common Stock issuable upon exercise of warrants held


                                        6

<PAGE>


by  Satellite  Communications   Investments   Corporation.   Such  warrants  are
exercisable  at any time  through  December 20,  1998,  at an exercise  price of
$21.00 per share,  subject  to  restriction  if such  exercise  would  cause the
Company's foreign ownership to exceed the levels permitted by the Communications
Act of 1934, as amended (the "Communications Act").

     Transit  Communications,  Inc. is indirectly  80%-owned by LIN Broadcasting
Corporation,  which  is an  indirect  subsidiary  of  AT&T  Wireless.  Satellite
Communications Investments Corporation and Space Technologies Investments,  Inc.
are direct or indirect subsidiaries of AT&T Wireless.

     (3)Singapore  Telecom  is  approximately   80%-owned  by  Temasek  Holdings
(Private)  Ltd.,  a  Singapore  holding  company  that is  wholly  owned  by the
Government of Singapore.  Includes  812,500 shares of Common Stock issuable upon
exercise  of  warrants  issued  in  connection  with  the  guaranty  of the bank
financings.

     (4)Does not include 1,524,217 Purchase Price shares of the Company's Common
Stock and  warrants  for shares of the  Company's  Common  Stock to Motorola the
issuance  of which  are  subject  to  Stockholder  approval  at the 1998  annual
meeting.

     (5)Includes  812,500  shares of Common  Stock  issuable  upon  exercise  of
warrants issued in connection with the guarantees of the bank financings.

     (6)Hughes  Communications Satellite Services, Inc. ("HCSSI") is an indirect
wholly-owned subsidiary of Hughes, which is a wholly-owned subsidiary of General
Motors  Corporation.  Includes  25,000  shares of  Common  Stock  issuable  upon
exercise of warrants  issued to HCSSI on January 19, 1996, in connection  with a
prior interim financing  facility guarantee and 4,875,000 shares of Common Stock
issuable upon exercise warrants issued in connection with the bank financings.

     (7)Includes  shares owned through the Company's matching 401(k) Plan and/or
Employee Stock Purchase Plan.

     (8)Includes  shares issuable upon the exercise of options granted under the
Director Plan which options are vested and  exercisable  within sixty days after
March 31, 1998, subject to compliance with applicable securities laws.

     (9)Includes  7,500  shares  owned by Private  Networks,  Inc., a company in
which Mr.  Parrott  owns a one-third  equity  interest.  Mr.  Parrott  disclaims
beneficial ownership as to all such shares of Common Stock.

     (10)Includes  1,050  shares  owned by trusts for the benefit of each of Mr.
Quartner's  three  children,  of which Mr.  Quartner is trustee,  and 100 shares
owned by Mr. Quartner's wife. Mr. Quartner disclaims  beneficial ownership as to
all such shares of Common Stock.

     (11)Includes shares issuable upon the exercise of options granted under the
1989 Plan which options are vested and exercisable within sixty days after March
31, 1998,  subject to compliance with applicable  securities laws. Also includes
shares of Restricted  Stock awarded under the 1989 Plan,  which are subject to a
number of conditions of forfeiture.


                                        7

<PAGE>



     (12)Includes  200  shares  owned by Mr.  Purnell's  wife,  as to which  Mr.
Purnell disclaims beneficial ownership.

Agreements Among Stockholders
- -----------------------------

Stockholders' Agreement
- -----------------------

American  Mobile and each  holder of shares of Common  Stock who  acquired  such
shares prior to the Company's  initial  public  offering of 8,500,000  shares of
Common  Stock,  which  was  completed  December  20,  1993,  are  parties  to  a
Stockholders'  Agreement,  amended  and  restated  as of  December  1, 1993 (the
"Stockholders' Agreement"). The remaining parties to the Stockholders' Agreement
(principally  Hughes,  Singapore Telecom,  and AT&T Wireless) hold approximately
50% of the  outstanding  shares of Common Stock,  on a fully diluted basis.  The
Stockholders'  Agreement sets forth agreements among the parties relating to the
governance   of  the   Company,   ownership   of  shares   and  the  voting  and
transferability of Common Stock and other matters.  The Stockholders'  Agreement
limits the  Company's  activities  to engaging in the  communications  business,
providing,  marketing and operating a mobile  satellite  service and engaging in
activities  necessary,  appropriate or reasonably related to the foregoing.  The
Stockholders'  Agreement  provides  that the  parties  will  not vote to  remove
members of the Board of Directors  except for cause and that they will not elect
or permit the election of a director who is not a United States citizen, if such
action would cause the Company to violate  applicable  law,  regulations  or FCC
policy.

In  the   Stockholders'   Agreement,   stockholders  who,  together  with  their
affiliates,  own in excess  of five  percent  of the  Common  Stock  ("Specified
Stockholders")  have also  agreed to cause  their  representatives  on  American
Mobile's Board of Directors to appoint to the Executive  Committee two directors
(and one alternate)  nominated by each of the two Specified  Stockholders  which
are parties to the  Stockholders'  Agreement  that hold the  greatest  number of
shares of Common Stock and one  director  (and one  alternate)  nominated by the
Specified  Stockholder  that holds the third greatest number of shares of Common
Stock,  provided that each Specified Stockholder making such nomination holds at
least  15%  (the  "Threshold  Percentage"),  of the  outstanding  Common  Stock.
Notwithstanding  the  foregoing,  regardless  of  whether  any  other  Specified
Stockholder which is a party to the Stockholders'  Agreement holds the Threshold
Percentage of the outstanding shares of Common Stock, during the period that any
single  Specified  Stockholder  or group of  affiliated  stockholders  which are
parties to the  Stockholders'  Agreement are the record holders of more than 50%
of the outstanding Common Stock, the Specified Stockholders have agreed to cause
their  Board  representatives  to vote  for  the  appointment  to the  Executive
Committee of nominees of that Specified Stockholder. The Stockholders' Agreement
also  provides that no person shall be elected to the Board of Directors if such
election  would  violate  the  Communications  Act  or  regulations  thereunder.
Furthermore,  the  Stockholders'  Agreement  provides that no director  shall be
elected to the Executive  Committee if such election,  in the opinion of counsel
for  American  Mobile,  would  raise a  reasonable  prospect  of  violating  the
Communications  Act or regulations  thereunder.  Moreover,  before any Specified
Stockholder  may elect a director of American  Mobile who is not a United States
citizen,  it must  first  allow  Singapore  Telecom  to elect  such a  director,
provided  Singapore  Telecom  casts  sufficient  cumulative  votes  to  elect  a
director.

The  Communications  Act provides that certain FCC licenses may not be held by a
corporation  of which more than 20% of its capital  stock is  directly  owned of
record or voted by non-U.S.  citizens or entities or their  representatives (the
Company's   wholly-owned   subsidiary,   AMSC  Subsidiary   Corporation   ("AMSC
Subsidiary"),  as the holder of the FCC  license to  construct  and  operate the
Company's mobile satellite  services system, is subject to these  restrictions).

                                        8

<PAGE>


Further,  the  Communications  Act provides that certain FCC licenses may not be
held by a corporation  controlled by another corporation if more than 25% of the
controlling  corporation's capital stock is owned of record or voted by non-U.S.
citizens or entities or their  representatives  ("Alien Ownership"),  if the FCC
finds that the public  interest is served by the refusal or  revocation  of such
license  (American  Mobile  controls AMSC Subsidiary and therefore is subject to
these  restrictions).   The  Stockholders'  Agreement  contains  procedures  for
reducing  the risk that the  Company  will fail to comply  with the FCC's  Alien
Ownership restrictions as a result of the ownership of the stockholders party to
that Agreement or their respective holdings in American Mobile.

The Stockholders' Agreement provides that when a Specified Stockholder transfers
Common Stock not acquired by such Specified  Stockholder in the open market, the
transferee shall become a party to the Stockholders' Agreement, and shall assume
all of the transferring Specified Stockholder's rights and obligations under the
Stockholders'  Agreement,  provided such transferee together with its affiliates
would,  giving effect to such  transfer,  hold in excess of 5% of the issued and
outstanding Common Stock.

The Stockholders'  Agreement  continues until terminated by the affirmative vote
of the holders of three-fourths of the issued and outstanding  Common Stock held
by parties to the Stockholders' Agreement. It may be amended by a three-fourths'
vote of the Specified  Stockholders,  except that  amendments to the  provisions
providing  for  registration  rights  and  certain  other  matters  require  the
affirmative vote of the holders of three-fourths of the outstanding Common Stock
held by parties to the Stockholders' Agreement.

Motorola Agreements
- -------------------

In connection  with the acquisition of ARDIS from Motorola by the Corporation on
March 31, 1998 (the "Acquisition"), and pursuant to the Stock Purchase Agreement
dated as of  December  31,  1997,  as  amended  March 31,  1998  (the  "Purchase
Agreement"),   American  Mobile,  Motorola  and  certain  of  American  Mobile's
principal  stockholders  (Hughes,  Singapore  Telecom  and AT&T  Wireless)  (the
"Participating   Stockholders")   have  agreed  to  certain   participation  and
registration rights with respect to American Mobile's Common Stock.

Pursuant to the terms of the  Participation  Rights  Agreements  entered into on
December 31, 1997 (the "Participation Rights Agreement"),  in the event that one
of the  Participating  Stockholders  seeks to  transfer  its shares of  American
Mobile's  Common  Stock  other than in a Rule 144 or public  stock  exchange  or
Nasdaq Stock  Market  transaction  (a  "Transfer")  at a time at which  Motorola
beneficially owns 5% or more of American  Mobile's Common Stock,  Motorola would
have a right to receive  notice of the intended  Transfer by such  Participating
Stockholder   and  a  right  to   participate   (proportionate   to   Motorola's
stockholdings  relative  to those  of such  Participating  Stockholder)  in such
contemplated   Transfer.   Under  the  Participation   Rights   Agreement,   the
Participating Stockholders would be entitled to similar notice and participation
rights in the event of an intended  transfer by  Motorola  of its  interests  in
American Mobile's Common Stock.

The  Participation  Rights  Agreement also provides that in connection  with the
Acquisition,  Motorola  would be  entitled to certain  demand and  participation
("piggyback")  registration rights with respect to the shares of Common Stock to
be issued to Motorola  (directly or following  exercise of its warrants) as part
of the purchase price of ARDIS. Pursuant to the Agreement,  after the first year
following the Acquisition,  Motorola or its transferees would be entitled to two
demand  registrations  with  respect to its shares of American  Mobile's  Common
Stock,  subject to certain  registration  priorities and postponement  rights of
American  Mobile.   In  addition,   Motorola  would  be  entitled  to  piggyback
registration  in  connection  with any  registration  of  securities by American

                                        9

<PAGE>


Mobile  (whether  or not for its own  account)  on a form  which may be used for
registration  of the Common  Stock  held by  Motorola.  Under the  Participation
Rights Agreement,  Motorola's  piggyback  registration rights would have certain
priorities  for sale over those of other parties  (including  the  Participating
Stockholders).  Motorola's  priority  rights,  however,  would  not  extend to a
primary  registration on behalf of American Mobile or to the registration rights
relating to the 12 1/4% senior notes and related  warrants (the "high yield debt
offering") issued by the Company in connection with the Acquisition.

In  addition,  under  the  Participation  Rights  Agreement,  the  Participating
Stockholders  and Baron Capital,  Inc. agreed with Motorola to vote their shares
of Common  Stock in favor of and take such other  action as may be  necessary to
approve the Acquisition,  including the issuance of shares of American  Mobile's
Common Stock to Motorola in connection with the Acquisition.



Executive Officers
- ------------------

Executive  Officers  of  American  Mobile  are  elected  by,  and  serve  at the
discretion  of,  the  Board of  Directors.  As part of  their  responsibilities,
Executive  Officers  also  currently  serve as officers of the  subsidiaries  of
American  Mobile,  including AMSC  Acquisition  Company,  Inc., AMSC Subsidiary,
American Mobile Satellite Sales Corporation,  Personal Communications  Satellite
Corporation,  AMSC Sales Corporation,  Ltd.,  American Mobile Radio Corporation,
AMRC Holdings,  Inc. (together with American Mobile Radio Corporation,  "AMRC"),
AMSC  ARDIS,   Inc.,  AMSC  ARDIS   Acquisition,   Radio  Data  Network  Holding
Corporation,  ARDIS  Company,  and ARDIS  Holding  Company.  Executive  Officers
receive no additional compensation for these services.  Information with respect
to the age, business  experience and the affiliations of the Executive  Officers
of American Mobile is set forth below.

     Gary M.  Parsons,  Chief  Executive  Officer  and  Chairman of the Board of
Directors,  joined the  Company in July 1996.  See  "Nominees"  for  information
regarding Mr. Parson's age, business experience and affiliations.

     Walter V. Purnell,  Jr., 52. American Mobile's President effective upon the
consummation of the  Acquisition in March 1998.  Prior to the  Acquisition,  Mr.
Purnell was President and Chief Executive Officer of ARDIS since September 1995.
Previously, Mr. Purnell had served as the chief financial officer of ARDIS since
its founding in 1990.  Prior to 1990,  Mr.  Purnell held a broad range of senior
executive  positions with IBM over 23 years, with financial  responsibility over
significant  telecommunications and other business divisions,  both domestically
and internationally.

     Robert L.  Goldsmith,  54. American  Mobile's  Executive Vice President and
Chief Operating  Officer since February 1997.  Prior to joining American Mobile,
Mr.  Goldsmith was the Senior Vice  President of Sales and Marketing and General
Manager of the Commercial  Services Division for Qwest  Communications  Company.
Prior to joining  Qwest in 1995,  Mr.  Goldsmith  was with MCI for nine years in
various executive sales and marketing positions.

     Randy S. Segal, 42. American  Mobile's Vice President,  General Counsel and
Secretary  since October 1992.  From October 1983 to October 1992, Ms. Segal was
associated  with the law firm of  Debevoise  & Plimpton  in New York,  New York.
Prior to  joining  Debevoise,  Ms.  Segal  clerked  for the  Honorable  Jerre S.
Williams of the United  States Court of Appeals for the Fifth  Circuit,  and for
the Honorable  Edmund L. Palmieri for the United States  District  Court for the
Southern District of New York.



                                       10

<PAGE>


     Stephen D. Peck, 53.  American  Mobile's Vice President and Chief Financial
Officer  since July 1997.  Mr. Peck was formerly  Executive  Vice  President and
Chief Financial Officer at Phillips Publishing  International  ("PPI"), which he
joined in 1986.  Prior to joining  PPI, Mr. Peck was Senior Vice  President  for
Finance and Administration of the Viguerie Company, which he joined in 1977.



Compensation and Stock Option Committee Report
- ----------------------------------------------

Introduction
- ------------

The Company's  compensation  policy for 1997 was established by the Compensation
and Stock Option  Committee  consisting  of Messrs.  Quartner,  Shaw,  Smith and
Zesiger.  Mr. Zesiger,  currently a director of American Mobile, is not standing
for reelection on the Board. In accordance with this policy,  which is discussed
in greater detail below,  the  Compensation  and Stock Option  Committee set the
base  salaries  of,  and  awarded  cash  bonuses,  stock  options  and shares of
restricted stock to, American Mobile's  Executive Officers for 1997. None of the
members of the  Compensation  and Stock Option  Committee  are  employees of the
Company.

 American Mobile's Compensation Policy. American Mobile's compensation policy is
designed  to (i) attract and retain a talented  and highly  motivated  executive
corps,  (ii) reward those  executives for attaining  personal,  departmental and
company-wide  goals,  and (iii) align the interests of those executives with the
interests of the Company's  stockholders.  Each of these objectives is addressed
to a greater or lesser extent by each of the three components of the executive's
compensation - base salary,  annual bonus,  and equity based awards  (restricted
stock awards and stock options).

The  Compensation  and Stock  Option  Committee  determined  in 1997 that  merit
increases would not be paid to senior executives, and upon recommendation by Mr.
Parsons,  that the Chief Executive Officer's base compensation would be reduced.
Instead,  the  Committee  approved a  proportionate  increase in at-risk,  bonus
compensation to such executives.  In view of the economic constraints facing the
Company,  the desirability of placing a greater  emphasis on  performance-based,
at-risk  compensation,  and the positive  message to be derived  throughout  the
organization by  implementation of such a salary reduction or freeze at the most
senior  management   levels,   the  Committee   believed  this  base  and  bonus
reallocation to be a desirable one.

In 1998, the Committee  determined that merit increases should again be paid and
returned Mr. Parsons' base salary to its original level of $350,000.

Annual   Bonus.   American   Mobile's   Executive   Officers  are  eligible  for
discretionary annual bonuses.  Performance  objectives are set annually for each
executive,  with relative values set for attaining each objective.  At year end,
the Chief Executive Officer of the Company assesses each executive's  success in
obtaining  his  or  her  performance   objectives,   and  makes  an  appropriate
recommendation  to the Compensation  and Stock Option  Committee  regarding such
executive's annual bonus. Such  recommendations are generally based, in part, on

                                       11

<PAGE>



quantitative  factors  relating to  attainment of corporate  objectives  and, in
part, on more qualitative factors relating to individual performance.

In 1998,  the Committee  determined  that the corporate  performance  objectives
originally set had not been achieved.  The Committee  determined,  however, that
additional transactional  achievement goals had been set by the Board during the
year.  Accordingly,  the  Committee  established  a modified  objective  for the
corporation - the successful consummation of the Acquisition - which if achieved
would provide the basis for payment of the corporate component of the bonus. The
Committee  based  this  determination  on the  need to  provide  incentives  and
reinforce the corporate  objectives,  while at the same time recognize  critical
alternative achievements by management.

Stock  Options.  The  number  of stock  options  granted  to each  executive  is
determined by the Compensation and Stock Option Committee in its discretion.  In
making its determination,  the Compensation and Stock Option Committee considers
the executive's position at the Company, his or her individual performance,  the
number of options held by the executive (if any) and other factors, including an
analysis of the estimated amount potentially realizable from the options.

In January  1998,  the Board of  Directors  granted  restricted  stock to senior
management  for the  first  time.  These  grants  include a  three-year  vesting
schedule as well as specific corporate performance targets related to either the
successful  fulfillment of the Company's lease of its satellite,  MSAT-2, or the
Company's  achievement  of  positive  EBITDA.  Unless  waived  by the  Board  of
Directors,  failure to meet a required  performance  target  would  prevent  the
vesting of the restricted shares.

On March 27,  1997,  the  Compensation  and Stock  Option  Committee  approved a
repricing of certain  options  granted to  employees  pursuant to the 1989 Plan.
Because of a decline in market  value of the  Company's  Common  Stock,  certain
outstanding options were exercisable at prices that exceeded the market value of
the Common  Stock.  In view of this  decline and in keeping  with the  Company's
philosophy  of utilizing  equity  incentives  to motivate  and retain  qualified
employees,  the  Compensation  and  Stock  Option  Committee  felt  that  it was
important to regain the incentive intended to be provided by options to purchase
shares of the Company's Common Stock.

Pursuant to the terms of the repricing,  175 option holders,  holding options to
purchase an aggregate of 634,361 shares of the Company's Common Stock,  that had
an exercise price of over $13.50 per share (the "Existing Options"), were issued
new options to purchase an equal number of shares at an exercise price of $13.00
per share,  above the fair market value of $11.065 of the Company's Common Stock
on March  27,  1997,  the date of the  repricing  (the "New  Options").  The New
Options modify the exercise price of the Existing Options to which each relates,
and like the Existing Options,  are governed by the 1989 Plan. The proportionate
share of vested options and the remaining  vesting  schedule for the New Options
remains the same as those of the Existing Options.  The terms of the New Options
are otherwise the same as the terms of the Existing Options that they replace.

Compensation  of the  President.  The  foregoing  principles  and policies  were
applied in determining the compensation of Mr. Parsons,  Chief Executive Officer
of American  Mobile.  During fiscal 1997, Mr. Parsons  received a base salary of
$317,692,  which was increased  $350,000 in January 1998. The  Compensation  and
Stock Option  Committee also awarded Mr. Parsons  options to purchase a total of
100,000 shares of the Company's Common Stock.

                                       12

<PAGE>



Tax Deductibility of Executive Compensation.  The Internal Revenue Code of 1986,
as  amended  (the  "Code"),  limits the  federal  income  tax  deductibility  of
compensation  paid to the Company's chief  executive  officer and to each of the
other four most highly compensated  Executive  Officers.  The Company may deduct
such   compensation  only  to  the  extent  that  during  any  fiscal  year  the
compensation  does not exceed $1 million or meets certain  specified  conditions
(such as  stockholder  approval).  Based on the Company's  current  compensation
plans and policies and recently released regulations  interpreting the Code, the
Company and the Compensation  and Stock Option  Committee  believe that, for the
near future, there is little risk that the Company will lose any significant tax
deduction  for  executive  compensation.   The  Compensation  and  Stock  Option
Committee intends to monitor this issue, and will consider  modifications of the
Company's  compensation  policies  as  conditions  warrant  and  to  the  extent
necessary to serve the best interests of the Company.

Andrew A. Quartner     Jack A. Shaw     Michael T. Smith     Albert L. Zesiger



Compensation and Stock Option Committee Interlocks and Insider Participation
- ----------------------------------------------------------------------------

During the fiscal year ended  December  31,  1997,  the  Compensation  and Stock
Option Committee of American Mobile's Board of Directors  consisted of Andrew A.
Quartner, Jack A. Shaw, Michael T. Smith and Albert L. Zesiger. During 1997, the
Company and AMSC Subsidiary  entered into contracts and other  transactions with
certain affiliates of Hughes and with Singapore Telecom.  All of these contracts
and  transactions  were  approved by American  Mobile's  Board of  Directors  or
Executive   Committee,   and  the  Company   believes  that  the  contracts  and
transactions  were made on terms  substantially  as  favorable to the Company as
could have been obtained from  unaffiliated  third  parties.  The following is a
description of such contracts and transactions.

In 1990,  following  a  competitive  bidding  process in which there was another
bidder,  the Company  entered into the  contract  (the  "Satellite  Construction
Contract") for the development and construction of the Company's first satellite
(the "Satellite") with Hughes Aircraft.  Hughes Aircraft, one of the largest and
most experienced  satellite  manufacturers  in the world,  built the Satellite's
bus. The bus is comprised of the spacecraft and the subsystems  used to maintain
the proper operation of the  communications  payload.  The Satellite is a Hughes
HS-601  system with a payload  specifically  designed for the  Company's  mobile
satellite system by Spar Aerospace,  Ltd. ("Spar"). In January 1997, the Company
reached an agreement  with Hughes  Aircraft to reduce the amount of  performance
payments owed by the Company by 27.5%,  and to defer all payments  otherwise due
until January 1998. In January 1998,  the Company  reached  agreement to further
defer payments otherwise due all the second quarter 1998.

In November 1994, AMSC Subsidiary  entered into an agreement with Hughes Network
Systems Limited ("HNS")  pursuant to which AMSC Subsidiary was granted an option
to  purchase  up to six  land  earth  stations  (each  an  "LES")  at a price of
$2,700,000  or Less per LES,  subject  to  discount  based on the number of LESs
actually  purchased.  Each LES acts as a switching network and interface between
signals  transmitted  from the  Satellite  and the  public  data  network.  AMSC
Subsidiary  initially exercised an option to purchase five LESs from HNS, two of
which were purchased on behalf of Rockwell International ("Rockwell"),  then one
of the Company's wholesale customers. The Company acquired the two Rockwell LESs
in November 1996, in connection  with its  acquisition  of Rockwell's  multimode
messaging  business.  The Company terminated its purchase of one LES, and paid a

                                       13

<PAGE>


$1.67 million  terminate  charge in accordance with the agreement.  HNS has also
agreed to supply to AMSC Subsidiary software  maintenance services in support of
the  operation  of the LESs at an annual rate of $760,000  for the twelve  month
period commencing December 1, 1997.

The  Company  has  entered  into  a  reseller  agreement  with  Hughes  Space  &
Communications Company,  through its Hughes Government Services ("HGS") business
unit, whereby American Mobile will sell the Company's services to HGS for resale
by HGS to federal government subscribers at rates to be established by HGS. Like
the  Company's  other  government  resellers,  HGS will set rates and prices for
services and equipment,  respectively  and will be  responsible  for billing and
collecting amounts due from its customers.

The Company  has  entered  into a  consulting  agreement  with HNS to obtain the
services of one HNS  employee,  formerly the Company  Chief  Scientist  (William
Garner)  to be  provided  to  American  Mobile  on a  half-time  basis.  In  the
consulting  arrangement,  the Company pays one-half of the consulting employee's
salary for the services.

On December 30,  1997,  American  Mobile  entered  into a bridge  facility  (the
"Bridge  Facility")  with HCSSI in the  principal  amount of up to $10  million,
secured by a pledge of American  Mobile's interest in its 80%- owned subsidiary,
AMRC.  The Bridge  Facility  bore an annual  interest rate of 12% and a maturity
date of March  31,  1999,  and  required  mandatory  repayment  in the event net
proceeds are received from any asset disposition,  lease agreement, financing or
equity  transaction of American  Mobile.  The Bridge Facility was fully drawn by
the end of the first  quarter of 1998,  and was repaid in full with a portion of
the proceeds from the  Company's  $335 million high yield debt offering on March
31, 1998. 

In connection with the Acquisition, the Company, the Acquisition Company and its
subsidiaries  renegotiated  the existing $200 million Bank  Financing (the "Bank
Financing")  with Morgan  Guaranty Trust Company of New York,  Toronto  Dominion
Bank, Bank of America  National Trust and Savings  Association and certain other
lenders  (collectively,  the  "Banks")  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
Banks' approval (collectively, the "New Bank Financing"). The Term Loan Facility
is secured by the  stockholdings of the Company,  principally its assets in AMRC
and the newly  formed  subsidiary,  in  connection  with the  Acquisition,  AMSC
Acquisition  Company,  Inc. The New Bank  Financing is severally  guaranteed  by
Hughes,  Singapore Telecom and Baron Capital Partners, L.P.  (collectively,  the
"Bank Facility Guarantors").

In exchange for the additional risks undertaken by the Bank Facility  Guarantors
in  connection  with the New Bank  Financing,  American  Mobile  has  agreed  to
compensate  the Bank Facility  Guarantors,  principally in the form of 1 million
additional  warrants and  repricing of 5.5 million  warrants  previously  issued
(together,  the "Guarantee  Warrants").  The Guarantee Warrants have an exercise
price of $12.51. The Bank Facility Guarantors have certain demand and piggy-back
registration  rights with  regard to the  unregistered  shares of the  Company's
Common Stock held by them or issuable upon  exercise of the Guarantee  Warrants.
Further,  in  connection  with the  guarantees,  American  Mobile  has agreed to
reimburse the Bank  Facility  Guarantors  in the event that the  Guarantors  are
required to make payment under the Revolving Credit Facility guarantees, and, in
connection  with this  reimbursement  commitment  has provided the Bank Facility
Guarantors a junior security interest with respect to the assets of the Company,
principally its stockholdings in AMRC and the AMSC Acquisition Company, Inc.



                                       14

<PAGE>



Performance Graph
- -----------------

The graph set forth below shows the  cumulative  total  return to holders of the
Company's  Common  Stock from  December  31,  1993,  through  December 31, 1997,
computed by dividing (i) the  difference  between the closing price per share at
the  beginning of such period and the last trading day of each month during such
period (the Company did not declare or pay  dividends on its Common Stock during
such  period) by (ii) the closing  share price at the  beginning of such period,
and compares such return to the performance during such period of the Center for
Research in Security  Prices  ("CRSP")  Total  Return Index for The Nasdaq Stock
Market (U.S.  Companies) ("Nasdaq U.S.") and the CRSP Nasdaq  Telecommunications
Stock Index ("Nasdaq  Telecom").  The Nasdaq U.S.  index  comprises all domestic
common  shares  traded on the Nasdaq  National  Market  and the Nasdaq  SmallCap
Market,  and the Nasdaq Telecom index  comprises all such domestic common shares
of companies  falling under Standard  Industrial  Classification  Code 48. These
indices are prepared for Nasdaq by the CRSP at the  University  of Chicago.  The
graph assumes $100 invested on December 31, 1993, in the Company's  Common Stock
(at $20.50 per share), the Nasdaq U.S. index and the Nasdaq Telecom index.



            COMPARISON OF FORTY-EIGHT MONTHS CUMULATIVE TOTAL RETURN

[GRAPHIC OMITTED]

<TABLE>
<CAPTION>

                         Dec. '93   Dec. '94   Dec. '95   Dec. '96   Dec. '97
                         --------   --------   --------   --------   --------

<S>                      <C>        <C>        <C>        <C>        <C>   
  American Mobile        100.000    62.195     149.390     59.756     34.146
  Nasdaq US              100.000    97.748     138.235    170.040    208.653
  Nasdaq Telecom         100.000    83.460     109.283    111.713    165.037
</TABLE>

                                       15

<PAGE>



Executive Compensation
- ----------------------

The  following  tables  set forth (a) the  compensation  paid or  accrued by the
Company to the Company's chief executive officer and its three other most highly
compensated  Executive Officers receiving over $100,000 per year (such officers,
the "Named  Executive  Officers") for services  rendered during the fiscal years
ended December 31, 1997, 1996 and 1995 and (b) certain  information  relating to
options granted to such individuals.
<TABLE>

   Summary Compensation Table
<CAPTION>

                                                                                 Long-Term        All Other
                                                                                Compensation       Compen-
                                         Annual Compensation                      Awards          sation(5)
                                         -------------------                      ------          ---------
   Name and                                                   Other Annual       Options/
   Principal Position        Year     Salary(1)  Bonus      Compensation(2)       SARs(3)
   ------------------        ----     ---------  --------   ---------------       -------

<S>                          <C>      <C>        <C>           <C>               <C>            <C>    
Gary M. Parsons              1997     $317,692   $158,000      $ 9,600           100,000        $    --
 President and               1996     $145,385   $ 87,500      $ 4,026           300,000             --
 Chief Executive Officer

Robert L. Goldsmith(5)       1997     $189,807   $ 76,406      $ 8,800           100,000             --
 Executive Vice President,
 Chief Operating Officer

Randy S. Segal               1997     $191,000   $ 66,850      $ 9,600            25,000             --
 Vice President, General     1996     $191,000   $ 52,716      $ 5,619            65,000             --
 Counsel and Secretary       1995     $183,750   $ 55,000      $40,341            12,000        $54,493

Stephen D. Peck(5)           1997     $ 88,154   $ 31,318      $ 4,465            50,000             --
 Vice President, Chief
 Financial Officer

</TABLE>

     (1)Effective  with  the  Acquisition,   Messrs.  Parsons',   Purnell's  and
Goldsmith's,   Ms.  Segal's  and  Mr.  Peck's   annualized  base  salaries  were
approximately $350,000, $225,000, $219,600, $204,400 and $195,400.

     (2)All dollar  amounts  reported for fiscal year 1995 relate to payments to
cover the Named  Executive  Officer's  increased taxes as a result of relocation
expense  reimbursements.  All dollar  amounts  reported for fiscal year 1997 and
1996 relate to the personal use of a company car and/or a car allowance.

     (3)The numbers reflect grants of options to purchase shares of Common Stock
under the 1989 Plan.  The  Company  has not granted  stock  appreciation  rights
("SARs").

     (4)Relates to relocation expense reimbursements.

     (5)Messrs.  Goldsmith and Peck joined the Company in February 1997 and July
1997, respectively.



                                       16

<PAGE>



Option/SAR Grants Last Fiscal Year
- ----------------------------------

The  following  table sets forth each grant of stock  options made during fiscal
year 1997 to each of the Named Executive Officers.
<TABLE>

                                       OPTION/SAR GRANTS IN LAST FISCAL YEAR
                                       -------------------------------------

<CAPTION>
                                                                                  
                                           Individual Grants                      Potential Realizable 
                                           -----------------                        Value at Assumed
                                                                                     Annual Rates of
                             Number of     % of Total                                   Stock Price
                             Securities    Options/SARs                              Appreciation for
                             Underlying    Granted to   Exercise or                   Option Term(3)
                             Options/SARs  Employees/   Base Price
     Name                    Granted(1)(2) Fiscal Year  ($/Share) Expiration Date   5%          10%
                             ------------- -----------  --------- ---------------   --          ---

<S>                           <C>            <C>        <C>            <C>        <C>       <C>       
Gary M. Parsons ..........     100,000       7.7373%    $12.81    Jan. 23, 2007   $806,021  $2,042,230
Robert L. Goldsmith.......     100,000       7.7373%    $12.50    Feb. 3, 2007    $786,118  $1,992,178
Randy S. Segal  ..........      25,000       1.9343%    $12.81    Jan. 23, 2007   $201,505    $510,558
Stephen D. Peck  .........      50,000       3.8686%     $9.06    July 14, 2007   $284,889    $721,965

</TABLE>


     (1)Does not include  options  granted on January 22, 1998,  with respect to
fiscal year 1997. The numbers reflect the grant of options to purchase shares of
Common Stock under the 1989 Plan. The Company has not granted SARs.

     (2)The options become exercisable in three annual installments,  vesting at
the rate of 33 1/3% per year for three years.

     (3)Based on actual option term and annual  compounding.  The actual value a
Named Executive  Officer may realize will depend upon the excess of the price of
the Common  Stock over the exercise  price on the date the option is  exercised.
Accordingly, there is no assurance that the value ultimately realized by a Named
Executive Officer, if any, will be at or near the values indicated.



Option/SAR Exercises and Year-End Option Values
- -----------------------------------------------

The following table sets forth,  for each of the Named Executive  Officers,  the
value of unexercised options at fiscal year-end:




                                       17

<PAGE>
<TABLE>



                               Aggregated Option/SAR Exercises in Last Fiscal Year
                                     and Fiscal Year-End Option/SAR Values (1)
<CAPTION>

                           Number of Securities Underlying         Value of Unexercised
                             Unexercised Options at Fiscal       in-the-Money Options/SARs
                                       Year-End(#)                 at Fiscal Year-End($)
     Name                    Exercisable/Unexercisable           Exercisable/Unexercisable
     ----                    -------------------------           -------------------------

<S>                                 <C>                                    <C>  
Gary M. Parsons.........            100,000/300,000                        $0/$0
Robert L. Goldsmith.....                 0/100,000                         $0/$0
Randy S. Segal .........            51,452/72,480                          $0/$0
Stephen D. Peck.........               0/50,000                            $0/$0

</TABLE>


     (1)None of the Named Executive Officers exercised options during the fiscal
year ended December 31, 1997. The Company has not granted SARs.

The following table sets forth each repriced grant of stock options made to each
of the Named Executive Officers.

<TABLE>

                                               OPTION/SAR REPRICINGS

                                                 Individual Grants

<CAPTION>
                                           Market                                   Length of
                           Number of      Price of        Exercise                   Original
                           Securities     Stock at        Price at                 Option Term
                           Underlying     Time of         Time of       New        Remaining at
                          Options/SARs   Repricing or   Repricing or  Exercise   Date of Repricing
Name               Date    Repriced       Amendment       Amendment    Price       or Amendment
- ----               ----    --------       ---------       ---------    -----       ------------


<S>                <C>      <C>            <C>             <C>          <C>       <C>             
Randy S. Segal     6/11/96  10,000         $18.75          $27.75       $18.75    9 years 7 months
                   3/27/97  20,000         $11.07          $18.75       $13.00    8 years 10 months
                   3/27/97  15,000         $11.07          $18.75       $13.00    9 years 3 months
                   3/27/97  12,000         $11.07          $14.62       $13.00    7 years 10 months
                   3/27/97  10,000         $11.07          $21.00       $13.00    6 years 9 months
                   3/27/97  11,932         $11.07          $21.00       $13.00    5 years 7 months

</TABLE>

Employment Agreements
- ---------------------

At  December  1997,  the  Company  was a party to change in  control  agreements
(collectively the "Change in Control  Agreements," and individually a "Change in
Control Agreement") with each of Robert L. Goldsmith,  Stephen D. Peck and Randy
S.  Segal,  as well as with  other  members of senior  management  (collectively
"Executives" and individually "Executive").  The Company has also entered into a
Change of Control  Agreement  with Walter V.  Purnell,  Jr.  Under the Change in

                                       18

<PAGE>


Control Agreements, the Company considers it essential to its best interests and
to the best  interests  of its  stockholders  to  retain  employment  of its key
management  personnel.  If a Change in  Control  occurs  during  the term of the
Change in Control  Agreement and the Company  terminates  the  employment of the
Executive  within two years  following the occurrence of such change of control,
(i) the Company  will  provide to each  Executive a lump-sum  severance  payment
equal to the sum of the  Executive's  annual  base  salary  and the  Executive's
average bonus, (ii) all options to purchase securities of the Company granted to
the Executive pursuant to the Company's 1989 Plan or any other Company plan that
are then held by the Executive  will be  accelerated to the later of the date of
termination  or six months  after the date such  option was  granted,  and shall
continue to be exercisable  for a two-year period after such  acceleration,  and
(iii) the Company shall provide the  Executive  with group term life  insurance,
health insurance,  accident and long-term disability  insurance benefits,  which
shall  continue for a  twelve-month  period or until the date the Executive will
reach age  sixty-five  substantially  similar in all  respects to those that the
Executive was receiving  immediately prior to the termination date. In addition,
the Company will pay to the  Executive  all  reasonable  legal fees and expenses
incurred by the Executive as a result of a termination.

The Company also entered  into  certain  arrangements  with Gary M. Parsons with
respect  to  change  in  control  of the  companies.  Mr.  Parsons'  agreements,
reflected in an initial  employment letter agreement and in his subsequent stock
option and  restricted  stock  agreements,  provide  that Mr.  Parsons  would be
entitled to one year's salary in the event his employment terminates following a
Change of Control,  and all equity  awards would vest upon the  occurrence  of a
change in  control  without  regard to  whether  Mr.  Parsons'  employment  were
terminated.


                  2. RATIFICATION OF APPOINTMENT OF ACCOUNTANTS

On the  recommendation  of the  Audit  Committee,  the  Board of  Directors  has
appointed Arthur Andersen LLP as independent accountants for the Company for the
year 1998,  subject to ratification  by the  stockholders at the annual meeting.
Arthur Andersen LLP have been the independent  accountants for the Company since
1988.  A  representative  of Arthur  Andersen  LLP will be present at the annual
meeting  of  stockholders  with the  opportunity  to make a  statement  if he so
desires and to respond to appropriate questions.

     The  Board  of  Directors   recommends  a  vote  FOR  ratification  of  the
     appointment  of Arthur  Andersen  LLP as  independent  accountants  for the
     Company for the year 1998.




                                       19

<PAGE>



                       3. APPROVAL OF 1989 PLAN AMENDMENT

Proposed Amendment
- ------------------

The American Mobile Satellite Corporation 1989 Plan was approved by the Board of
Directors in December 1989. There are currently 3,500,000 shares of Common Stock
reserved for  issuance  under the 1989 Plan.  On January 21, 1998,  the Board of
Directors of the Company approved for submission to stockholders an amendment to
the 1989 Plan which will increase the number of shares of Common Stock  reserved
for issuance under the 1989 Plan from 3,500,000 shares to 4,500,000 shares.

As of March 31, 1998,  option grants and  restricted  stock awards for 3,353,841
shares were granted and outstanding,  and 81,205 options had been exercised.  If
the  amendment  is  approved,  there will be  1,064,854  shares of Common  Stock
available for grant under the 1989 Plan.


Reason for the Amendment
- ------------------------

The Company utilizes stock option grants as part of its compensation program for
executives and employees. In this way, the Company links compensation at various
levels  within  the   organization  to  performance  and  believes  that  it  is
appropriate  to continue  such  practice in the future  through the use of stock
options.  In addition,  the Company believes that the use of stock option grants
to executives  and  employees  helps to provide  incentive  for their  continued
employment and otherwise  more closely aligns their  interests with those of the
Company's  stockholders.  As a result,  the  Board of  Directors  believes  that
1,000,000  additional  shares of Common Stock should be made available under the
1989 Plan in order to facilitate the continued use of stock options as a part of
the Company's incentive compensation program.


Terms of the 1989 Plan
- ----------------------

The 1989 Plan is  intended  to assist the Company in  attracting  and  retaining
employees  of  outstanding  ability and to promote the  identification  of their
interests with those of the  stockholders of the Company.  The 1989 Plan permits
the  grant of  nonstatutory  stock  options  and award of bonus  stock  covering
3,500,000  authorized but unissued or reacquired shares of Common Stock, subject
to  adjustment  to  reflect  events  such  as  stock  dividends,  stock  splits,
recapitalizations, mergers or reorganizations of or by the Company.

As of December 31, 1997, stock options covering 1,676,441 shares of Common Stock
were  outstanding,  which options were held by 207 persons at a weighted average
exercise  price of $13.06 per share.  As of March 31, 1998,  the market value of
the shares  underlying  such options (as  reflected in the closing price for the
Company's  Common  Stock  as  reported  through  the  National   Association  of
Securities  Dealers  Automated  Quotation  system)  was $14.25  per  share.  The
exercise  price of all  options  granted  under  the 1989 Plan has been at least
equal to the fair  market  value of the  Common  Stock on the date of grant,  as
determined in good faith by the Board.

See "Option/SAR Grants Last Fiscal Year," above for additional information about
options granted under the 1989 Plan.


                                       20

<PAGE>



Unless sooner  terminated by the Board, the 1989 Plan will expire on December 6,
2003. Such termination will not affect the validity of any option grant or stock
award outstanding on the date of termination.

The 1989 Plan is administered by the  Compensation and Stock Option Committee of
the Board and is intended to satisfy  the  requirements  of Rule 16b-3 under the
Securities Exchange Act of 1934. Subject to the terms and conditions of the 1989
Plan, the  Compensation  and Stock Option  Committee has the authority to select
the  persons to whom  grants of options or awards of bonus stock are to be made,
to  designate  the number of shares of Common Stock to be covered by such grants
or  awards,  and to make all other  determinations  and take all  other  actions
necessary or advisable for the administration of the 1989 Plan.

Subject to the terms and conditions of the 1989 Plan, the Compensation and Stock
Option Committee may modify,  extend or renew outstanding options, or accept the
surrender of outstanding  options granted under the 1989 Plan or under any other
stock  option  plan of the  Company and  authorize  the  granting of new options
pursuant to the 1989 Plan in substitution  therefor. The substituted options may
specify a lower exercise price than the surrendered  options, a longer term than
the surrendered  options or have any other provisions that are authorized by the
1989 Plan.

The 1989 Plan may be amended by the Board,  subject to  stockholder  approval if
such approval is then  required by applicable  law or in order for the 1989 Plan
to continue to satisfy the  requirements  of Rule 16b-3 under the Securities and
Exchange Act.

Stock  options  and bonus  stock  may be  granted  or  awarded  only to  persons
determined by the Compensation and Stock Option Committee to be employees of the
Company. As of February 1, 1998, the Company had approximately 289 employees. An
employee may receive more than one option or award of bonus stock, provided that
no employee may be granted  options or bonus stock under the 1989 Plan  covering
more than 50% of the shares of Common Stock reserved for issuance under the 1989
Plan as set forth above.

Stock options  granted  under the 1989 Plan will have  exercise  prices not less
than the greater of the fair market value of the  optioned  stock at the date of
grant or the par value of the optioned stock.  Generally,  options granted under
the 1989 Plan shall not be  exercisable  until the expiration of six months from
the date of grant or have a term greater than ten years after the date of grant.
Without limiting the Compensation and Stock Option Committee's  discretion as to
the terms of stock options granted in accordance with the provisions of the 1989
Plan,  options  granted under the 1989 Plan generally  become  exercisable as to
331/3% of the stock covered thereby on each of the first three  anniversaries of
the date of grant,  generally  terminate ten years after the date of grant,  and
generally  have an exercise price equal to the fair market value of the optioned
stock at the date of grant.  The  Compensation and Stock Option Committee may in
its  discretion  provide  that  options  granted  under the 1989 Plan  expire at
specified times following, or become exercisable in full upon, the occurrence of
certain events, including a change of control, death, disability or retirement.

The 1989 Plan  permits  the payment of the option  exercise  price to be made in
cash (which may include an  assignment of the right to receive the cash proceeds
from the sale of Common  Stock  subject to the option  pursuant  to a  "cashless
exercise"  procedure)  or by delivery of shares of Common  Stock valued at their
fair market value on the date of exercise,  or by a combination of both cash and
Common Stock. The 1989 Plan also provides,  unless  otherwise  determined by the
Compensation  and Stock  Option  Committee  and set forth in an  agreement,  for
satisfaction of an optionee's or grantee's tax liabilities arising in connection


                                       21

<PAGE>


with the 1989 Plan  through  retention  by the Company of shares of Common Stock
issuable  upon the  exercise of a  nonstatutory  stock  option or pursuant to an
award of bonus  stock or  through  delivery  of shares  of  Common  Stock to the
Company subject to the terms and conditions set forth in the 1989 Plan and under
such other terms and conditions as the  Compensation  and Stock Option Committee
deems appropriate.

The Compensation  and Stock Option  Committee may in its discretion  provide for
the right of the  optionee  to  surrender  to the  Company an option (or portion
thereof) that has become  exercisable and receive upon such  surrender,  without
any  payment to the  Company,  that number of shares of Common  Stock  having an
aggregate  fair market value equal to the number of shares subject to the option
being  surrendered  multiplied by an amount equal to the difference  between the
fair market value of a share of Common  Stock on the date of  surrender  and the
option exercise price,  plus an amount of cash equal to the fair market value of
any  fractional  share.  The  Compensation  and Stock Option  Committee also may
provide  for the grant of a new  option to an  optionee  upon the  surrender  of
shares of Common Stock to pay the option exercise price of a previously  granted
option.  The number of shares  subject to any such new  option  shall  equal the
number of shares  surrendered to pay the option exercise  price,  and the option
exercise  price for any such new option will not be less than the greater of the
fair market value of the optioned stock at the date of grant or the par value of
the optioned stock.

Options granted under the 1989 Plan shall not be transferable  otherwise than by
will,  by the laws of  descent  and  distribution  or  pursuant  to a  qualified
domestic  relations order (as defined in the Code),  and may be exercised during
the optionee's  lifetime only by the optionee or, in the event of the optionee's
legal disability, by the optionee's legal representative.

Bonus  stock  may also be  awarded  under the 1989  Plan.  A bonus  stock  award
consists  of shares of Common  Stock that may be issued  from time to time under
such conditions (if any) that the  Compensation  and Stock Option  Committee may
prescribe.  Such conditions  might include such matters as continued  employment
with the  Company  for a  specified  period of time or  achievement  of  certain
performance goals.

In January  1998,  the Board of  Directors  granted  restricted  stock to senior
management for the first time.  These grants included both a three-year  vesting
schedule  as  well  as  specific  corporate   performance  targets  relating  to
successful  fulfillment of the Company's lease of its satellite or the Company's
achievement of positive EBITDA. Unless waived by the Board of Directors, failure
to meet a required  performance  target would prevent  vesting of the restricted
shares.

An  optionee  will not  recognize  income on the grant of a  nonstatutory  stock
option,  but  generally  will  recognize  ordinary  income on the  exercise of a
nonstatutory  stock option. The amount of income recognized on the exercise of a
nonstatutory  stock option generally will be equal to the excess, if any, of the
fair  market  value of the  shares at the time of  exercise  over the  aggregate
exercise price paid for the shares,  regardless of whether the exercise price is
paid in cash or in shares. Where ordinary income is recognized by an optionee in
connection with the exercise of a nonstatutory stock option, the Company will be
entitled to a deduction in the amount of ordinary income so recognized,  subject
to satisfying tax withholding requirements.

A grantee  who is  awarded  bonus  stock  that is not  subject  to  restrictions
generally will recognize  ordinary income with respect to the shares on the date
of grant.  If the shares of bonus  stock are  subject to a  substantial  risk of
forfeiture  on the date of grant,  the  grantee is not  required  to include the
value of such  shares  in  ordinary  income  until the  shares  become no longer


                                       22

<PAGE>


subject to a substantial  risk of  forfeiture,  unless the grantee  elects to be
taxed on receipt  of the  shares.  In either  case,  the  amount of such  income
generally  will be equal to the fair market  value of the shares at the time the
income is recognized.  The Company will be entitled to a deduction in the amount
of  ordinary  income  so  recognized,  subject  to  satisfying  tax  withholding
requirements.

The rules  governing  the tax  treatment  of  options  and bonus  stock,  and an
optionee's  or  grantee's  receipt of shares in  connection  with such grants or
awards,  are quite technical,  so that the above description of tax consequences
is necessarily general in nature and does not purport to be complete.  Moreover,
statutory   provisions  are,  of  course,   subject  to  change,  as  are  their
interpretations,  and their  application  may vary in individual  circumstances.
Finally,  the tax consequences under applicable state law may not be the same as
under the federal income tax laws.

Recommendation and Vote Required
- --------------------------------

The affirmative  vote of the holders of a majority of the Company's Common Stock
present  in person or by proxy and  entitled  to vote at the  annual  meeting is
required to approve the amendment to the 1989 Plan.

   The Board of Directors recommends a vote FOR the approval of this proposal.

PROXIES WILL BE VOTED FOR THE APPROVAL OF THE  AMENDMENT TO THE 1989 PLAN UNLESS
OTHERWISE INDICATED ON THE PROXY.


            4. APPROVAL OF ISSUANCE OF STOCK FOR ACQUISITION OF ARDIS

The Acquisition
- ---------------

On March 31, 1998, the Company  acquired  ARDIS in accordance  with the Purchase
Agreement.  Subject to certain purchase price adjustments, the Company completed
the  Acquisition  for a 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 Common Stock  ("Warrants"),
payable only if the stockholders  approve the issuance of such additional shares
and Warrants  (the  "Additional  Issuance").  The Warrants will have an exercise
price of $.01 per share.

The  Company's  Common Stock is quoted on the Nasdaq  National  Market under the
symbol ("SKYC"). Under the rules of the Nasdaq National Market, the Company must
obtain stockholder approval prior to the issuance of Common Stock, or securities
convertible  into or  exercisable  for Common  Stock if (a) the issuance of such
securities  is in  connection  with the  acquisition  of the  stock or assets of
another  company  and (b)  either  (i) the  common  stock  to be  issued  in the
transaction  will have upon its  issuance  voting power equal to or in excess of
20% of the voting power of the issuer's  common  stock  outstanding  before such
issuance or (ii) the number of shares of common stock to be issued is or will be
equal to or in excess of 20% of the number of shares of common stock outstanding
before such issuance. Accordingly, prior to the Additional Issuance, the Company
must obtain  approval  from its  stockholders,  since the shares of Common Stock
paid at the closing,  together with the Additional  Issuance will represent more
than 20% of the voting  power of its Common Stock or more than 20% of the number
of shares of Common Stock outstanding prior to such Additional Issuance.

                                       23

<PAGE>



             STOCKHOLDERS ARE NOT BEING ASKED TO APPROVE THE
             ACQUISITION.  A FAILURE OF THE COMPANY'S STOCKHOLDERS
             TO APPROVE THE ADDITIONAL ISSUANCE WILL NOT HAVE ANY
             EFFECT ON THE ACQUISITION.

In connection with the Purchase  Agreement,  the holders of approximately 76% of
the Company's Common Stock (Hughes,  Singapore Telecom,  Baron Capital, Inc. and
AT&T  Wireless)  have  agreed with  Motorola to vote in favor of the  Additional
Issuance.  Such shares of Common Stock will be  sufficient to establish a quorum
and  to  approve  the  Additional   Issuance  without  the  vote  of  any  other
stockholder.

Reasons for the Acquisition
- ---------------------------

With the Acquisition,  the Company is a leading provider of nationwide  wireless
communications services, including data, dispatch, and voice services, primarily
to business customers in the United States. The Company now offers a broad range
of end-to-end  wireless  solutions  using a seamless  network  consisting of the
nation's largest,  most fully-deployed  terrestrial  wireless data network and a
satellite in geosynchronous orbit.

Through its ability to offer a broad  range of services on a  nationwide  scale,
the Company  believes  that it is well  positioned  to serve the needs of mobile
workers in the United  States.  Within its  addressable  market,  the Company is
concentrating  its sales and  marketing  efforts  on the  transportation,  field
services,  and emerging two-way messaging markets. The Company believes that its
combination  of  guaranteed  delivery  and high  reliability,  deep  in-building
penetration and geographic breadth of coverage provide a significant competitive
advantage over other competing networks.


Pro Forma Summary Financial and Other Data
- ------------------------------------------

The following  summary pro forma financial  information  gives effect to (i) the
Acquisition,  (ii) the high yield debt offering and (iii) the New Bank Financing
as if such transactions had been consummated on December 31, 1997 in the case of
the State of Operations  Data and Other  Financial and  Operating  Data,  and on
January  1, 1997 in the case of the  Balance  Sheet  Data of  Operations  of the
Company.  The  pro  forma  combined  financial   information  is  presented  for
illustrative  purposes  only  and is not  necessarily  indicative  of  what  the
Company's actual financial position or results of operations would have been had
the  above-referenced  transactions been consummated as of the  above-referenced
dates or of the financial position or results of operations that may be reported
by the Company in the future.

The following data should be read in conjunction with the Company's Consolidated
Financial Statements and related notes, ARDIS' Combined Financial Statements and
related notes,  "Management's Discussion and Analysis of Financial Condition and
Results of  Operations,"  and other  financial  information  included  elsewhere
herein, as applicable.


                                       24

<PAGE>




<TABLE>
<CAPTION>

                                                    Year Ended December 31, 1997
                                                    ----------------------------



(Dollars in thousands, except subscribers and revenue per unit)

<S>                                                          <C>      
Statement of Operations Data:
Revenues:
     Services                                                $  62,109
     Equipment and consulting                                   25,856
                                                             ----------
          Total revenue                                         87,965

Operating loss                                                (117,021)
Net loss                                                      (176,382)

Other Financial and Operating Data:
Number of subscribers (end of period) (1)                       81,300
Average monthly revenue per unit (1)                         $      69
EBITDA (2)                                                     (56,872)
Depreciation and amortization                                   59,274
Capital expenditures                                            10,029
Ratio of earnings to fixed charges (3)                              --


Balance Sheet Data:
Cash and cash equivalents                                    $  26,206
Restricted cash (4)                                            123,000
Property and equipment, net                                    274,975
Total assets                                                   612,893
Total debt (5)                                                 447,374
Total stockholders' equity                                     104,631

</TABLE>

     (1) Number of subscribers and average monthly revenue per unit calculations
have been  adjusted  to account  for  subscribers  common to ARDIS and  American
Mobile.

     (2) "EBITDA"  consists of operating  income  (loss) plus  depreciation  and
amortization.  EBITDA is a  financial  measure  commonly  used in the  Company's
industry and should not be construed as an alternative  to operating  income (as
determined  in accordance  with GAAP) or as a measure of liquidity.  EBITDA does
not represent funds available for dividends, reinvestment or other discretionary
activities.  EBITDA has been  adjusted to include  $875,000 of other income from
the licensing of certain technology.

     (3) For  purposes of  calculating  the ratio of earnings to fixed  charges,
earnings are defined as loss before  income taxes and  extraordinary  items plus
fixed charges.  Fixed charges consist of interest expense,  amortization of debt
issuance  costs,  accretion  of discount  on  preferred  stock and a  reasonable
approximation  of the interest  factor  included in rental payments on operating
leases.  Earnings  were  inadequate  to cover  fixed  charges for the year ended
December 31, 1997 by $176.4 million.

     (4)Restricted cash includes pledged securities purchased in connection with
the financing of the Acquisition of $113.0 million and $10.0 million escrowed to
fulfill potential obligations under a customer contract.

     (5)Subsequent  to December  31, 1997,  the Company drew down the  remaining
$2.0  million  under the certain  bank  financing,  and drew down $10.0  million
available  under the bridge facility prior to the closing of the high yield debt
offering.  Upon  consummation  of the  high  yield  debt  offering  and  partial
repayment  of the Bank  Financing,  it is expected  that the  Company  will have
$100.0 million available for borrowing under the Revolving Credit Facility.

                                       25

<PAGE>



ARDIS
- -----

ARDIS,  a leading  provider of nationwide  wireless  data  service,  markets its
service  primarily  to  business  customers  with a need for  reliable,  two-way
wireless data  communications in the field services and transportation  markets.
The ARDIS  wireless  data  network  provides  the  widest  breadth of any single
provider  of  terrestrial  wireless  service in the United  States.  The network
incorporates  approximately  1,700 radio  towers  (base  stations)  that provide
service to 425 of the largest cities and towns in the United  States,  including
virtually  all  metropolitan  areas.  The network was  designed  and built using
Motorola  technology  to provide  reliable  two-way  data  communications,  deep
in-building  penetration and efficient  frequency usage. The extensive  coverage
and deep in-building  penetration provided by the ARDIS network is attractive to
customers who desire a single service  provider whose  nationwide  scope extends
from large  metropolitan  areas to smaller  cities and towns.  Customers such as
IBM,  NCR,  Pitney  Bowes,  and  Sears use  applications  such as  service  call
dispatch,  asset tracking,  and peer-to-peer  communications to achieve critical
business  objectives  resulting in  increased  productivity,  profitability  and
customer satisfaction.

The executive offices of ARDIS are located at 300 Knightsbridge  Parkway,  Suite
500, Lincolnshire, Illinois 60069, telephone: (847) 913-1215.

Selected Financial and Other Data
- ---------------------------------

Set forth  below is the  selected  financial  data for ARDIS for the five fiscal
years ended December 31, 1997:

<TABLE>
<CAPTION>


(dollars in thousands, except for per share data)
                                               1997           1996            1995            1994           1993
                                               ----           ----            ----            ----           ----
                                                                                                  (Unaudited)
                                                                                                  -----------
<S>                                         <C>            <C>              <C>            <C>             <C>    
Revenues                                     $44,249        $45,297          $41,272        $50,907         $46,604
Net Loss                                     (11,742)       (18,998)         (25,253)       (22,504)        (40,446)
Net Loss Per Common Share(1)                      --             --               --             --              --
Dividends on Common Stock(1)                      --             --               --             --              --
Consolidated Balance Sheet Data:
Cash and Cash Equivalents                      2,082          5,289            6,985         16,035           8,896
Property Under Construction                       --             --               --             --              --
Total Assets                                  69,830         91,252          103,231         83,368          61,113
Current Liabilities                           12,807         13,281           14,569         27,428          12,970
Long-Term Obligations                          8,931         12,830           16,395             --              --
Stockholders' Equity                          48,092         65,141           72,267         55,940          48,143
</TABLE>

     (1)The financial results of ARDIS present the combined  financial  position
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.  As such, net loss per
common share and dividends on common stock are not applicable.


                                       26

<PAGE>



ARDIS

Management's Discussion and Analysis of Financial Condition 
and Results of Operations
- ------------------------------------------------------------

Year Ended December 31, 1997 Compared to Year Ended December 31, 1996
- ---------------------------------------------------------------------

     Operating  Revenues.  Services  revenues  were  $41.9  million  for 1997 as
compared to $43.4  million for 1996.  The decrease in revenue  reflects  reduced
usage during 1997 by several large accounts, including UPS which was impacted by
the strike in 1997.

     Revenue  from the  sale of  equipment  increased  to $2.3  million  in 1997
compared from $1.9 million in 1996.  Devices made available from RIM during 1997
and continued demand for the Motorola PCMCIA modem contributed to the increase.

     Costs and Expenses.  Total costs and expenses  decreased  approximately 17%
during 1997  compared to 1996.  Cost of services  and  operations  for 1997 were
$31.9  million,  a decrease  from $32.8  million for 1996.  This decline was due
primarily  due to continued  cost  savings  derived  from the  consolidation  of
network operations which were commenced during 1996.

     The cost of  equipment  sold for 1997  increased  to $2.3 million from $1.4
million for 1996 in relation to the increased revenue from equipment sales.

     Sales and  marketing  expenses for 1997 were $5.9  million,  a decline from
$13.7 million for 1996. The decline was  attributable  primarily to ARDIS' shift
from a  consumer  market  focus  in 1996 to its  traditional  vertical  business
markets focus in 1997. Sales and marketing costs as a percentage of revenue were
13% in 1997 and 30% in 1996.

       General and administrative  expenses in 1997 were $7.0 million, a decline
from $9.4  million in 1996.  This  decline  was  attributable  primarily  to (i)
reduced  headcount  and personnel  related costs which had supported  horizontal
marketing  efforts  (ii) reduced  software  license  expenses and (iii)  reduced
reserve  requirements.  As a percentage of revenue,  general and  administrative
expenses represented 16% in 1997 and 21% in 1996.

     Depreciation and amortization  expense in 1997 was $14.6 million, a decline
from $17.3  million in 1996.  The decline  was  attributable  to the  originally
contributed   network  assets  in  1990  becoming  fully  depreciated  in  1997.
Depreciation  and  amortization  expense as a percentage  of revenue was 33% for
1997 and 38% for 1996.

     Interest and Other Income.  Net interest expense was $1.2 million for 1997,
a decline  from $1.4  million  in 1996.  This  decline  was as a result of lower
capital lease balances.

     Capital  Expenditures.  Capital  expenditures  for 1997 were  $1.4  million
compared to $3.4 million for 1996. The decrease in capital  expenditure  amounts
reflects the  significant  capital  expenditures  made in 1996 and prior periods
that  provided   sufficient  network  capacity  and  therefore  reduced  capital
expenditure requirements in 1997.



                                       27

<PAGE>



Certain Effects of the Additional Issuance on Stockholders
- ----------------------------------------------------------

The Additional  Issuance will have a dilutive effect on the voting rights of the
holders of Common Stock. In addition, upon exercise of the Warrants,  there will
be substantial  and immediate  dilution to existing  stockholders as a result of
the exercise price for such Warrants.

As a result of the Acquisition,  Motorola will be the second largest stockholder
of the Company,  holding approximately 20.6% of the Company's outstanding Common
Stock,  following the Additional Issuance.  In addition,  in connection with the
Acquisition,  Motorola  received certain  registration  rights for its shares of
Common Stock and Common Stock subject to the  Warrants.  See  "Agreements  Among
Stockholders -- Motorola Agreements."


Recommendation and Vote Required
- --------------------------------

The affirmative vote of a majority of the total votes cast,  excluding shares of
Common Stock held by Motorola,  is required to approve the Additional  Issuance.
In connection with the Purchase  Agreement,  the holders of approximately 76% of
the Company's Common Stock (Hughes,  Singapore Telecom,  Baron Capital, Inc. and
AT&T  Wireless)  have  agreed with  Motorola to vote in favor of the  Additional
Issuance.  Such shares of Common Stock will be  sufficient to establish a quorum
and  to  approve  the  Additional   Issuance  without  the  vote  of  any  other
stockholder.

The Board of  Directors  unanimously  approved the  Purchase  Agreement  and the
closing of the  Acquisition.  As discussed  above, the Company believes that the
Acquisition  represents  a  strategic  fit between two  companies  with  similar
business  strategies and complementary  products and operations.  As a result of
the  Acquisition,  the Company  believes that it will be able to capitalize upon
meaningful  operational  synergies that could expedite the Company's  ability to
generate positive operating results.  In addition,  the Company believes that it
will be able to  enhance  revenue  growth  through  cross-selling  opportunities
between the  Company's  and ARDIS'  sales  forces.  The Company  also expects to
rationalize its cost structure through (i) network optimization and integration,
(ii) office and systems consolidation and (iii) limited personnel reductions.

           The Board of Directors recommends a vote FOR the Additional Issuance.


             SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

Under the securities  laws of the United States,  the Company's  directors,  its
executive  officers,  and any  persons  holding  more  than ten  percent  of the
Company's  common stock are required to report their  ownership of the Company's
common stock and any changes in that  ownership to the  Securities  and Exchange
Commission and the National Association of Securities Dealers, Inc. Specific due
dates for these  reports  have been  established  and the Company is required to
report in this proxy  statement  any failure to file by these  dates.  No person
associated with the Company who was required to file under these rules failed to
file any such required report. In making this statement,  the Company has relied
on the written  representations  of its directors and officers and copies of the
reports that have been filed with the SEC.

                                       28

<PAGE>




                                  OTHER MATTERS

The Board of Directors is not aware of any other  matters to be presented at the
annual  meeting.  If any other matter proper for action at the meeting should be
presented,   the  holders  of  the  accompanying  proxy  will  vote  the  shares
represented by the proxy on such matter in accordance  with their best judgment.
If any matter not proper for  action at the  meeting  should be  presented,  the
holders of the proxy will vote against consideration thereof or action thereon.

All shares represented by the accompanying  proxy, if the proxy is duly executed
and  received  by the Company at or prior to the  meeting,  will be voted at the
meeting in accordance with any  instructions  specified on such proxy and, where
no instruction is specified, as indicated on such proxy.



                               PROPOSALS FOR 1999

In  accordance  with rules  promulgated  by the SEC, the Company will review for
inclusion  in next year's  proxy  statement  stockholder  proposals  received by
November 30,  1998.  Proposals  should be sent to the  Secretary of the Company,
10802  Parkridge  Boulevard,   Reston,  Virginia  20191-5416.  In  addition,  in
accordance with Article II, Section 13 of the Company's  Bylaws,  in order to be
properly brought before the 1999 annual meeting of  stockholders,  a stockholder
submitting  a proposal  must file a written  notice  with the  Secretary  of the
Company  which  conforms  to the  requirements  of the  Bylaws.  If the Board of
Directors  or a  designated  committee  or  officer  who  will  preside  at  the
stockholders  meeting  determines that the  information  provided in such notice
does not satisfy the  informational  requirements  of the Bylaws or is otherwise
not in accordance  with law, the stockholder  will be notified  promptly of such
deficiency and be given an  opportunity  to cure the deficiency  within the time
period prescribed in the Bylaws.  Such notice of a stockholder  proposal must be
delivered  not less than 60 days nor more than 120 days prior to the date of the
annual  meeting  to be held in 1998  (unless  such  notice  relates to a special
meeting or the annual  meeting is called to be held before the date specified in
the Bylaws,  in which case the  stockholder  proposal must be delivered no later
than the close of business on the tenth day  following  the date on which notice
of the meeting is publicly announced).




                                       29

<PAGE>




                               1997 ANNUAL REPORT

American  Mobile's  Annual  Report on Form 10-K for the year ended  December 31,
1997,  including  financial  statements  ("Annual  Report"),  is being furnished
concurrently  with this Proxy  Statement  to persons  who were  stockholders  of
record as of March  31,  1998,  the  record  date for the  Annual  Meeting.  The
information  set forth in the Annual  Report under Items 1 through 3 and Items 5
through 9 is incorporated by reference into this Proxy Statement.  Except to the
extent so incorporated, the Annual Report does not form part of the material for
the solicitation of proxies.

                                 By order of the Board of Directors,
                                 Randy S. Segal
                                 Vice President and Secretary

Reston, Virginia
April 27, 1998


                                       30

<PAGE>





                                      INDEX


Audited financial statements of ARDIS......................................  F-1

Independent auditors' report...............................................  F-2

ARDIS financial statements.................................................  F-3

Notes to financial statements..............................................  F-7





<PAGE>


Audited Financial Statements

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

                                      F-1

<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

                                      F-2

<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>

                                      F-3
<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:
     Cost of 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>

                                      F-4

<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>

                                      F-5

<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>
                                      F-6
<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 revenues 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,  and  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.

                                      F-7
<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.

                                      F-8
<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.

   
                                   F-9
<PAGE>
 (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
     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>

                                      F-10

<PAGE>

     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.


(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."

                                      F-11

<PAGE>

(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%.


     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:

                                      F-12

<PAGE>
     ---------------------------------------------------------------------------
         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.



(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>

                                      F-13

<PAGE>

<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>

         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.

                                      F-14

<PAGE>

(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.





                                      F-15
                                 

<PAGE>



                                      INDEX


Pro forma summary financial and other data...................................P-1

Pro forma unaudited balance sheet as of December 31, 1997....................P-2

Pro forma unaudited income statement as of December 31, 1997.................P-3

Notes to pro forma financial statements......................................P-4

                                       

<PAGE>


Pro Forma Summary Financial and Other Data
- ------------------------------------------

     The following  summary pro forma financial  information gives effect to (i)
     the  Acquisition,  (ii) the high yield debt offering and (iii) the New Bank
     Financing as if such transactions had been consummated on December 31, 1997
     in the case of the Unaudited Pro Forma Consolidated Condensed Balance Sheet
     of the  Company,  and on January 1, 1997 in the case of the  Unaudited  Pro
     Forma Consolidated  Statements of Operations of the Company.  The pro forma
     combined financial  information is presented for illustrative purposes only
     and is not necessarily  indicative of what the Company's  actual  financial
     position or results of operations would have been had the  above-referenced
     transactions  been consummated as of the  above-referenced  dates or of the
     financial  position  or results of  operations  that may be reported by the
     Company in the future.

     The  following  data  should  be read in  conjunction  with  the  Company's
     Consolidated  Financial  Statements  and  related  notes,  ARDIS'  Combined
     Financial  Statements  and  related  notes,  "Management's  Discussion  and
     Analysis  of  Financial  Condition  and Results of  Operations,"  and other
     financial information included elsewhere herein, as applicable.


                                      P-1

<PAGE>

                      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>

                                      P-2
<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>
                                      P-3


<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>

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


                                      P-4
<PAGE>

<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>

                                      P-5
<PAGE>
     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.

     (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.

                                      P-6
<PAGE>

        This Proxy is Solicited By The Board of Directors of the Company

                      AMERICAN MOBILE SATELLITE CORPORATION

                    PROXY FOR ANNUAL MEETING OF STOCKHOLDERS

                                  May 20, 1998

The  undersigned  hereby  constitutes and appoints Gary M. Parsons and Walter V.
Purnell,  Jr., and each of them, true and lawful agents and proxies ("Proxies"),
with full power of  substitution  and  revocation  in each, to attend the Annual
Meeting of Stockholders of American Mobile  Satellite  Corporation to be held at
9:00 a.m. on Wednesday, May 20, 1998 at the Sheraton Reston Hotel, 11810 Sunrise
Valley Drive,  Reston,  Virginia,  and any adjournments  thereof, and thereat to
vote all shares of Common Stock which the undersigned  would be entitled to vote
if  personally  present  (i) as  designated  upon the  matters  set forth on the
reverse  side,  and (ii) in their  discretion,  upon the  approval of minutes of
prior meetings of the  stockholders and such other business as may properly come
before  the  meeting.  This proxy when  properly  executed  will be voted in the
manner  directed  herein by the  undersigned  stockholder.  If  directed  by the
undersigned  to vote for the  nominees,  or if no direction  is made,  the votes
represented  by this proxy will be voted FOR the ten  nominees  listed  below in
such  proportions  as  determined  by the Proxies in their  discretion  so as to
maximize the likelihood of electing all such nominees;  provided,  however, that
(i) if directed by the  undersigned to withhold votes from one or more nominees,
the votes represented by this proxy will be voted FOR the remaining  nominees as
set forth above,  and (ii) if,  prior to the  election,  any such nominee  shall
become  unavailable  for  election or unable to serve,  the Proxies may vote for
such other persons as may be nominated. If no direction is made, this proxy will
be voted FOR Proposals 2,3 and 4 set forth on the reverse side. The  undersigned
hereby revokes any proxy or proxies heretofore given to vote such shares at said
meeting or any adjournments thereof.


Election of Directors, Nominees:

Douglas I. Brandon, Ho Siaw Hong, Pradeep P. Kaul,
Billy J. Parrott, Gary M. Parsons, Andrew A. Quartner,
Jack A. Shaw, Roderick M. Sherwood, Michael T. Smith
and Yap Chee Keong.


       (change of address/comments)

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

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

- ----------------------------------------
(If you have written in the above space,  please mark the  corresponding  box on
 the reverse side of this card.)

You are encouraged to specify your choices by marking the appropriate boxes, SEE
REVERSE SIDE.


<PAGE>


(REVERSE SIDE)

1.  Election of Directors

    |_|  For All Nominees      |_|  Withheld From All Nominees

    |_|  For, except vote withheld from the following nominee(s):

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

2.  Ratification  of the  appointment  of  Arthur  Andersen  LLP as  independent
    accountants for the Company for the year 1998.

    For  |_|             Against  |_|            Abstain  |_|


3.  Amendment to the Company's  1989 Stock Option Plan to increase the number of
    shares authorized for issuance.

    For  |_|             Against  |_|             Abstain |_|


4. Issuance of shares of the Company's Common Stock to Motorola, Inc.

    For  |_|             Against  |_|             Abstain  |_|


|_|  Change of address/comments on reverse side.


INSTRUCTIONS:

1. Please sign exactly as name is printed hereon. 
2. If shares are held jointly, each holder should sign.
3. If signing as executor or trustee or in similar  fiduciary  capacity,  please
   give full title as such.
4. If a  corporation,  please sign full  corporate  name by  President  or other
   authorized officer.
5. If a partnership, please sign partners name by authorized person.




SIGNATURE(S)                                       DATE





<PAGE>


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