AMERICAN MOBILE SATELLITE CORP
PRE 14A, 2000-04-05
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:

|X| Preliminary Proxy Statement
|_| Confidential,  for  Use  of the  Commission  Only  (as  permitted  by  Rule
    14a-6(e)(2))
| | 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 Tuesday,  May
23, 2000 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 Tuesday, May 23, 2000, at 9:00
a.m., for the following purposes:

1. To elect six directors;

2. To  consider  and  act  upon a  proposal  to  amend  the  Company's  Restated
Certificate  of  Incorporation  to remove  the  Certificate  of  Incorporation's
requirement of a minimum Board size;

3. To  consider  and  act  upon a  proposal  to  amend  the  Company's  Restated
Certificate  of  Incorporation  to  change  the  requirement  for  amending  the
Certificate of Incorporation  from two-thirds of the outstanding common stock to
a majority of the outstanding common stock;

4. To consider and act upon a proposal to amend and restate the  Company's  1989
Employee Stock Option Plan as the "American Mobile Satellite  Corporation  Stock
Award  Plan," in order to increase  the number of  authorized  shares  available
under such plan to  7,300,000,  and to amend  certain  other  provisions of such
plan;

5. To consider  and act upon a proposal to amend the  Company's  Employee  Stock
Purchase Plan to increase the number of authorized  shares  available  under the
Employee Stock Purchase Plan from 300,000 to 600,000;

6. To  consider  and act upon a  proposal  to ratify the  appointment  of Arthur
Andersen LLP as independent  accountants  for American Mobile for the year 2000;
and




<PAGE>



7. 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, 2000 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  20191 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
                                             Senior Vice President and Secretary

Reston, Virginia
April 19, 2000



<PAGE>




[GRAPHIC OMITTED]



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




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 23, 2000, and any
postponement  or  adjournments  thereof.  The annual meeting will be held at the
Sheraton Reston Hotel, 11810 Sunrise Valley Drive,  Reston,  Virginia,  and will
commence at 9:00 a.m. Any  stockholder  giving a 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 19, 2000.

The only class of  securities  of American  Mobile  entitled to vote at the 2000
annual meeting is its common stock, of which 49,455,775  shares were outstanding
on March 31, 2000. Only stockholders of record at the close of business on March
31,  2000 will be entitled to vote at the annual  meeting.  The  presence at the
annual meeting of the holders of a majority of the issued and outstanding shares
of common stock  entitled to vote,  either in person or  represented by properly
executed  proxies,  is necessary to constitute a quorum for the  transaction  of
business at the  meeting.  If there are not  sufficient  shares  represented  in
person or by proxy at the  meeting to  constitute  a quorum,  the meeting may be
postponed or adjourned in order to permit further solicitation of proxies by the
Company.  Proxies given  pursuant to this  solicitation  and not revoked will be
voted at any  postponement  or  adjournment  of the annual meeting in the manner
described elsewhere in this proxy statement.



                                        1

<PAGE>



Each  stockholder  has one vote for each share of common stock held. In Proposal
1, the election of directors,  each  stockholder  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 (six) 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.

Proposals 2 and 3, which seek  approval of certain  amendments  to the Company's
Certificate of Incorporation, will require the affirmative vote of two-thirds of
the  shares  of  common  stock  issued  and  outstanding  on  the  record  date.
Abstentions  with respect to such  proposals will have the same effect as a vote
against such proposals.

Each of Proposals 4, 5, and 6 will require the  affirmative  vote of the holders
of a majority  of the shares  present in person or  represented  by proxy at the
annual  meeting.  Abstentions  will be treated as votes  present and entitled to
vote and thus will have the effect of a vote against these proposals.

Brokers  who hold shares in street  name for  beneficial  owners do not have the
authority  to  vote  on  certain  matters  for  which  they  have  not  received
instructions from beneficial owners.  Broker non-votes (arising from the lack of
instructions from beneficial  owners) will not be included in the vote totals on
Proposals  2 or 3,  and  thus  will  affect  the  outcome  of the  vote on those
Proposals.  Broker non-votes will not affect the outcome of the vote on Proposal
4, Proposal 5 or Proposal 6. Broker non-votes will be counted in determining the
existence of a quorum.

The cost of soliciting  proxies in the form  enclosed  herewith will be borne by
the Company. The Company has engaged Georgeson Shareholder Communications, Inc.,
to assist in the distribution of proxy materials and the solicitation of proxies
at a cost of approximately $8,500 plus out of pocket expenses. In addition,  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 materials to and
obtain  proxies from the beneficial  owners,  and the Company will reimburse the
holders for their reasonable out-of-pocket expenses in so doing.


                                        2

<PAGE>



                            1. ELECTION OF DIRECTORS

It is  intended  that the  persons  named in the proxy  will,  unless  otherwise
instructed,  vote for the election of the six 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.

The Board currently comprises six members,  with one vacancy.  Because there are
only six nominees for election as directors at the annual  meeting,  the present
vacancy  remains.  While the Board  continues  to  explore  the  possibility  of
increasing its size by adding one or more directors,  it has determined that the
current size and  composition  of the Board is  appropriate.  Also, as described
below under  Proposal 2,  "Amendment to the Company's  Restated  Certificate  of
Incorporation  to Remove the Requirement of a Minimum Board Size,"  stockholders
are being asked at the annual  meeting to approve an amendment to the  Company's
Restated   Certificate   of   Incorporation   to  remove  the   Certificate   of
Incorporation's  existing requirement that the Board comprise at least seven (7)
members.  If stockholders  approve such Proposal 2, the present vacancy would be
eliminated,  effective as of the date of the annual meeting.  If stockholders do
not approve Proposal 2, then the present vacancy would remain until such time as
an additional director is added to the Board.

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,  49. American  Mobile's Chairman of the Board of Directors
since March 1998, Mr. Parsons has been an American Mobile director, and formerly
Chief Executive  Officer and President of American Mobile,  since July 1996. Mr.
Parsons  also serves as the  Chairman of the Board of  Directors of XM Satellite
Radio Holdings Inc. ("XM Radio").  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.

                                        3

<PAGE>



     Douglas I. Brandon, 41. An American Mobile director since 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.

     Billy J.  Parrott,  65. 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.

     Walter V. Purnell,  Jr., 54. An American  Mobile director and the Company's
Chief  Executive  Officer  since January  1999,  Mr.  Purnell also serves as the
President, a position he has held since March 1998. Previously,  Mr. Purnell was
President and Chief  Executive  Officer of ARDIS since  September  1995.  Before
that, Mr. Purnell had served as the chief  financial  officer of ARDIS since its
founding  in 1990.  Before  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.

     Andrew A.  Quartner,  46. 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 1997, Mr. Quartner was Senior Vice
President,  Law, of AT&T Wireless,  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, 61. An American Mobile director and formerly  Chairman of the
Board of  Directors  of  American  Mobile  since July 1996,  Mr.  Shaw is Senior
Executive   Vice   President   of  Hughes   Electronics   Corporation   ("Hughes
Electronics").  Mr.  Shaw  is a  member  of  the  Hughes  Electronics  Executive
Committee.  Mr. Shaw also serves as a Director of XM Radio.  Prior to Mr. Shaw's
current  position,  Mr. Shaw was Chairman and Chief Executive  Officer of Hughes
Network  Systems  ("HNS") and Executive  Vice  President of Hughes  Electronics.
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.

The Board of Directors recommends that stockholders vote FOR the election of the
six persons nominated to serve as Directors.

                                        4

<PAGE>

Board Committees, Meetings and Compensation

The Board of  Directors  has an Audit  Committee  which  currently  consists  of
Messrs.  Parrott and Quartner.  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 1999.

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.  Parrott,  Parsons and Shaw. The Nominating
Committee  met  once  during  1999.  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 the Company's Annual
Meeting in 2001," below.

The Board of Directors has a Compensation  and Stock Option  Committee  which is
responsible for administering  American Mobile's 1989 Employee Stock Option Plan
(the  "Option  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. Brandon, Parrott, Parsons, Purnell, Quartner, and Shaw. As described
elsewhere in this proxy  statement,  stockholders are being asked to approve the
amendment and restatement of the Option Plan. The  Compensation and Stock Option
Committee  will continue to administer  the Option Plan.  The  Compensation  and
Stock Option Committee met once during 1999 and took action by unanimous written
consent twice during 1999.
See "Compensation and Stock Option Committee Report."

The Board of Directors also 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. See "Agreements Among  Stockholders." The
current  members  of the  Executive  Committee  are  Messrs.  Brandon,  Parrott,
Parsons, Purnell, Quartner and Shaw. The Executive Committee did not meet during
1999.

The Board of Directors has an Independent  Committee  which is  responsible  for
reviewing  possible  transactions in which one or more of the Directors may have
an interest. The current members are Messrs. Brandon,  Parrott and Quartner. The
Independent Committee met twice during 1999.

The Board of Directors met 11 times during 1999.  All director  nominees  except
Mr.  Quartner  attended  75% or more  of all  Board  meetings  and  meetings  of
committees of which they were members during 1999.


                                        5

<PAGE>




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
per year; Audit Committee,  $2,500 per year; Independent  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.
Messrs. Parrott and Quartner elected to have such amounts paid to them directly.
All other directors elected to forego receipt of retainer and committee fees.

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  1999 Stock  Option Plan for  Non-Employee  Directors
("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 5,000 shares of common stock, and automatically receives annually an
option to purchase  2,500 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 years  from the date of grant or (ii) seven
months after a director's termination of service as a director.

Eligible  Directors  are also  eligible to receive  discretionary  stock  option
grants  under  the  Director   Plan.  In  1999,  the  Board  of  Directors  made
discretionary  stock option grants to two  directors,  in  recognition  of those
directors'  long-time  service  on  behalf  of the  Board of  Directors  and the
Company,  and also in  recognition  of assistance  provided by such directors on
special  projects.  During 1999, Mr. Quartner received  discretionary  grants of
options to purchase  10,000 shares of Common Stock at $4.61 and 20,000 shares of
Common Stock, at an exercise price of $8.84 per share,  and Mr. Parrott received
discretionary  options to purchase 20,000 shares of Common stock, at an exercise
price of $8.84 per share.

As described elsewhere in this proxy statement,  stockholders are being asked to
approve the amendment and restatement of the Option Plan. Under the Option Plan,
as  proposed  for   amendment,   Eligible   Directors   would  be  eligible  for
discretionary  option  grants.  Future  grants  of  stock  options  to  Eligible
Directors  will be made under the Option Plan.  See  "Proposal 4.  Amendment and
Restatement  of the 1989  Employee  Stock  Option  Plan as the  American  Mobile
Satellite Corporation Stock Award Plan."


                                        6

<PAGE>



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, 2000 (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)                               3,001,145           6.07%
         1150 Connecticut Avenue, N.W.
         Washington, DC  20036

         Baron Capital, Inc.(3)                                        6,150,881          12.23%
         767 Fifth Avenue, 24th Floor
         New York, NY 10153

         Hughes Communications Satellite Services, Inc.(4)            11,661,796          21.42%
         Building S66/D468
         Post Office Box 92424
         Los Angeles, CA  90009

         Motorola, Inc.                                                2,470,532           4.99%
         1303 East Algonquin Road
         Schaumberg, IL 60196

         Noah A. Samara, Trustee                                       4,094,244           8.28%
         XM Ventures
         c/o WorldSpace, Inc.
         2400 N Street, NW
         Washington, DC 20037

         Directors and Executive Officers
         Douglas I. Brandon ........................................       5,000              *
         Robert L. Goldsmith(5)(9)  ................................     159,869              *
         Billy J. Parrott(6)(7) ....................................      33,600              *
         Gary M. Parsons(5)(9)  ....................................     638,582           1.29%
         Walter V. Purnell, Jr.(5)(9)(10)  .........................     173,958              *
         Andrew A. Quartner(6)(8)       ............................      41,000              *
         Jack A. Shaw(6)............................................       6,000              *
         Randy S. Segal(5) (9)......................................     177,159              *
         W. Bartlett Snell(9).......................................      55,100              *

         All Directors and Executive Officers as a
         group (9 persons)(5)(9) ...................................   1,290,268           2.55%
</TABLE>

         * Less than 1%
                                        7



<PAGE>



               (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
          (1,113,135   shares)   and  Space   Technologies   Investments,   Inc.
          (1,206,192).  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)Includes 828,281 shares of common stock issuable upon exercise
          of  warrants  issued in  connection  with the  guarantees  of the bank
          financings.

               (4)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  25,486 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 4,969,688 shares of common stock issuable upon
          exercise warrants issued in connection with the bank financings.

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

               (6)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,  2000,  subject to  compliance  with
          applicable securities laws.

               (7)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.

               (8)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.

               (9)Includes  shares issuable upon the exercise of options granted
          under the Option Plan which options are vested and exercisable  within
          sixty days after March 31, 2000, subject to compliance with applicable
          securities  laws.  Also includes  shares of  restricted  stock awarded
          under the Option Plan,  which are subject to a number of conditions of
          forfeiture.

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

                                        8

<PAGE>

Agreements Among Stockholders

Motorola Agreement

In  connection  with the  acquisition  of ARDIS from  Motorola by the Company on
March 31, 1998 (the "ARDIS  Acquisition"),  and  pursuant to the Stock  Purchase
Agreement  dated as of December 31, 1997,  as amended  March 31, 1998,  American
Mobile, Motorola and certain of American Mobile's principal stockholders (Hughes
and  AT&T  Wireless)  (the  "Participating   Stockholders")  agreed  to  certain
registration rights with respect to American Mobile's common stock.  Pursuant to
the terms of the  Participation  Rights  Agreement  entered into on December 31,
1997 (the  "Participation  Rights  Agreement"),  Motorola is entitled to certain
demand and participation  ("piggyback")  registration rights with respect to the
shares of common  stock  issued to  Motorola  as part of the ARDIS  Acquisition.
Motorola  or its  transferees  are  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  is  entitled  to  piggyback   registration   in  connection  with  any
registration  of  securities  by  American  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 have certain priorities for sale over those of other parties
(including the Participating Stockholders). Motorola's priority rights, however,
do not extend to a primary  registration on behalf of American Mobile.  Motorola
has  registered  all of its shares of American  Mobile  common  stock on a shelf
registration  statement filed by American  Mobile and declared  effective by the
SEC on March 31, 1999.


XM Ventures Agreements

The Company is  obligated  to register for resale the shares of its Common Stock
acquired by XM Ventures  pursuant to an Exchange  Agreement,  dated July 7, 1999
(the "Exchange  Agreement") by and among the Company,  XM Radio and  WorldSpace,
Inc. ("WorldSpace"). This resale registration statement was filed by the Company
and declared effective by the SEC on August 12, 1999.

XM  Ventures  also has  "piggyback"  registration  rights  with  respect  to its
American  Mobile  stock,  when  the  Company  proposes  to  register  any of its
securities in an underwritten public offering. The piggyback registration rights
granted to XM Ventures are subject and  subordinate to the  registration  rights
under all of the Company's other existing  registration  rights  agreements with
other parties.


                                       9

<PAGE>



In  addition,  beginning  on the  later  of July  7,  2001  or the  exercise  or
expiration of all demand  registration  rights under all of the Company's  other
existing  registration  rights  agreements  with other parties,  but in no event
later than July 7, 2002,  XM Ventures is  entitled  to two  underwritten  demand
registrations on customary terms and procedures.  These demand registrations are
subject  to the  right of the  Company's  Board of  Directors  to delay any such
registration  for up to 90 days  upon its good  faith  determination  that  such
registration is not in the Company's best interests at that time.

XM  Ventures  has agreed to certain  restrictions  on the  transfer of shares of
Common Stock received pursuant to the Exchange Agreement. Of the approximately 4
million  shares  of Common  Stock  originally  issued  to and  still  held by XM
Ventures,   approximately   3.4  million   shares  are  subject  to  contractual
restrictions on XM Ventures' ability to sell or otherwise  transfer such shares.
Of these  shares,  approximately  1.7 million  shares may be sold by XM Ventures
after April 7, 2000,  and the remainder may be sold by XM Ventures after July 7,
2000.

There are also restrictions under the Exchange Agreement on XM Ventures' ability
under  certain  circumstances  to transfer its shares of American  Mobile common
stock to WorldSpace or any affiliate of  WorldSpace,  or to non-U.S.  persons or
entities in which non-U.S. persons have a significant interest.

Stockholders' Agreement

American  Mobile and each  holder of shares of Common  Stock who  acquired  such
shares  prior  to  the  Company's  initial  public  offering  are  parties  to a
Stockholders'  Agreement,  amended  and  restated  as of  December  1, 1993 (the
"Stockholders'   Agreement").   The  remaining   parties  to  the  Stockholders'
Agreement,   AT&T  Wireless  and  Hughes,  hold  approximately   26.93%  of  the
outstanding  Common Stock on a fully diluted basis. The Stockholders'  Agreement
includes provisions relating to certain corporate governance matters, as well as
the voting and  transferability of shares of Common Stock held by the parties to
such  agreement,  and provisions  intended to ensure  compliance with applicable
laws and FCC regulations.  While the Stockholders' Agreement technically remains
in effect, its practical effect has been reduced, or eliminated,  as a result of
the changing nature of the Company's stockholder base and the increasing portion
of the outstanding shares of Common Stock held by the public.


                                       10

<PAGE>



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  Acquisition
Company"), AMSC Subsidiary, AMSC Subsidiary Corporation of Virginia, AMSC ARDIS,
Inc., AMSC ARDIS Acquisition, Inc. and ARDIS 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, 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., Chief Executive Officer and President,  joined the
Company in March 1998. See "Nominees" for  information  regarding Mr.  Purnell's
age, business experience and affiliations.

     Robert L. Goldsmith,  56. American Mobile's former Executive Vice President
and Chief Operating Officer.  Prior to joining American Mobile in February 1997,
Mr.  Goldsmith was the Senior Vice  President of Sales and Marketing and General
Manager of the Commercial  Services  Division for Qwest  Communications  Company
("Qwest").  Prior to joining Qwest in 1995, Mr.  Goldsmith was with MCI for nine
years  in  various  executive  sales  and  marketing  positions.  Mr.  Goldsmith
terminated his employment with the Company effective March 24, 2000.

     Dennis W. Matheson,  39. American  Mobile's Senior Vice President and Chief
Technology  Officer since March 2000. From 1993 to March 2000, Mr. Matheson held
other technical  positions with American Mobile, most recently as Vice President
of Engineering and Advanced  Technology.  Before joining  American  Mobile,  Mr.
Matheson was Senior Manager of Systems  Architecture for Bell Northern Research,
a subsidiary of Northern Telecom.  Prior to that, he held various positions with
Northern  Telecom  and Bell  Northern  Research  within the  design and  product
management organizations,  and before that he held various engineering positions
with Texas Instruments.

     Randy S.  Segal,  44.  American  Mobile's  Senior Vice  President,  General
Counsel and Secretary since October 1992. Ms. Segal also serves as a Director of
XM Radio.  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.


                                       11

<PAGE>



     W. Bartlett Snell,  48.  American  Mobile's Senior Vice President and Chief
Financial  Officer  since March 1999.  Mr.  Snell was  formerly  the Senior Vice
President and Chief Financial Officer at Orbcomm Global, L.P. ("Orbcomm"), which
he joined in 1996. Prior to joining Orbcomm,  Mr. Snell spent 16 years at IBM in
a variety of leadership positions in diverse business areas.

Compensation and Stock Option Committee Report

Introduction

The Company's  compensation  policy for 1999 was established by the Compensation
and Stock Option  Committee  consisting of Messrs.  Brandon,  Parrott,  Parsons,
Purnell,  Quartner, and Shaw. 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,  and stock  options to,  American
Mobile's Executive Officers for 1999.

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).

In  determining   the  base  salaries  of  Executive   Officers  for  1999,  the
Compensation and Stock Option Committee continued its evaluation, begun in 1998,
of the  consistency  of base and bonus  compensation  for  executive  and senior
management.  Salary  increases  were  based on a  consideration  of  maintaining
comparable  base  salaries,  within  the  context  of  recognizing  the level of
individual performance during 1999.

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

                                       12

<PAGE>



Equity Based Awards.  The number and type of equity based awards 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 and other factors, including an analysis of the estimated
amount potentially realizable from the award.

In January  2000,  the  Committee  approved the grant of stock options to senior
management to continue to align the  interests of  management  with those of the
stockholders,  and to  incentivize  and retain those  executives.  A significant
portion   of   these   option   grants   to  key   employees   include   certain
performance-based   provisions.    Specifically,    the   Committee   identified
approximately  33 key employees  whose  performance  was deemed to most directly
impact the Company's  ability to accomplish its Year 2000 corporate  performance
objectives,  including the  subscribers,  revenues and EBITDA (the  "Performance
Options").  These  Performance  Options do not vest until the seventh (7th) year
following grant, unless the specified corporate  performance  objectives are met
in which  case the  options  could vest one year after  grant.  The  Performance
Options also include individual performance objectives to be met to achieve full
accelerated vesting of the Performance Options.

The Committee  determined the number of regular options and Performance  Options
to grant to these specified key employees as follows:  The level of grants which
traditionally  would have been made to each employee were halved, and that "half
grant"  was  made in the  form of  regular,  three-year  vesting,  options.  The
Committee then granted to the specified  employees  special  Performance  Grants
that require full  achievement  of corporate  objectives  for any option vesting
prior to seven years after grant. The Committee  increased the remaining,  "half
grant" to the  employees  by threefold in the  Performance  Grant,  to provide a
strong incentive to the employees for full achievement of corporate goals.

The  Committee  believes that  achievement  of the  corporate  objectives  bring
significant  benefit to the stockholders,  and that the performance  options are
well- designed to target and assist in achieving those objectives.

Compensation  of the Chief  Executive  Officer.  The  foregoing  principles  and
policies were applied in determining  the  compensation  of Mr.  Purnell,  Chief
Executive  Officer during 1999.  During fiscal 1999, Mr. Purnell received a base
salary of $259,462 and a bonus of $86,625. In January 2000, the Compensation and
Stock Option  Committee also awarded Mr. Purnell  options to purchase a total of
200,000 shares of the Company's common stock,  150,000 of which were Performance
Options.


                                       13

<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.

Douglas I. Brandon          Billy J. Parrott               Gary M. Parsons
Walter V. Purnell, Jr.      Andrew A. Quartner             Jack A. Shaw



Compensation and Stock Option Committee Interlocks and Insider Participation

During the fiscal year ended  December  31,  1999,  the  Compensation  and Stock
Option  Committee of American  Mobile's Board of Directors  consisted of Messrs.
Brandon,  Parrott, Parsons, Purnell, Quartner and Shaw. During 1999, the Company
and certain of its  subsidiaries  entered into contracts and other  transactions
with certain  affiliates of Hughes. 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 1997, the Company reached an agreement with Hughes Aircraft, the manufacturer
of the Company's  satellite (the "Satellite"),  to reduce by 27.5% the amount of
certain  performance  payments owed by the Company to Hughes  Aircraft under its
Satellite  construction  contract and to defer all payments  otherwise due until
January 1998, based on certain satellite performance considerations. Thereafter,
certain  additional  contractual  payment issues were raised by the Company.  At
present, discussions are underway between the companies regarding such payments.

                                       14

<PAGE>



Hughes Network Systems Limited  ("HNS"),  the manufacturer of the Company's land
earth stations (each an "LES") has provided AMSC Subsidiary software maintenance
services in support of the operation of the LESs at an annual rate of $1,000,000
for the twelve month period commencing December 1, 1999.

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.  For 1999, the total amount of sales
to HGS were $24,637.

In connection with the ARDIS Acquisition,  the Company, AMSC Acquisition Company
and its subsidiaries  entered into agreements with Morgan Guaranty Trust Company
of New York, Toronto Dominion Bank, 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 "Bank Financing").  The Term Loan Facility is secured by the
assets  of the  Company,  principally  its  stockholdings  in XM Radio  and AMSC
Acquisition Company,  which was formed in connection with the ARDIS Acquisition.
The   Bank   Financing   is   severally   guaranteed   by   Hughes,    Singapore
Telecommunications,  Ltd. and Baron Capital Partners,  L.P.  (collectively,  the
"Bank Facility Guarantors").  The principal amount of the Term Loan Facility has
been reduced to $41.0 million as of March 31, 2000.

In exchange for the additional risks undertaken by the Bank Facility  Guarantors
in connection  with the Bank Financing,  American  Mobile agreed,  pursuant to a
Guaranty Issuance  Agreement dated March 31, 1998 (the "GIA"), 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").  As originally  issued,  the  Guarantee  Warrants had an
exercise price of $12.51.  Further, in connection with the guarantees,  American
Mobile agreed to reimburse  the Bank  Facility  Guarantors in the event that the
Bank  Facility  Guarantors  were  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 XM
Radio and AMSC Acquisition Company.


                                       15

<PAGE>



The Bank  Facility  Guarantors  also  obtained  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.
Pursuant to the terms of the Amended and Restated  Registration Rights Agreement
among the Bank Facility  Guarantors  and the Company (the  "Registration  Rights
Agreement"),  the Company  agreed to (i) extend the  expiration  date for demand
registration  rights  with  respect to the Bank  Facility  Guarantors'  existing
warrants,  (ii) provide  registration rights for the warrants issued pursuant to
the GIA, and (iii) provide  registration rights for other restricted  securities
held by the Bank Facility  Guarantors.  Under the Registration  Rights Agreement
the Bank Facility  Guarantors  are entitled to up to three demand  registrations
with  respect to their  shares of American  Mobile's  common  stock,  subject to
certain  registration  priorities and postponement rights of American Mobile. In
addition the Bank Facility Guarantors are entitled to piggyback  registration in
connection  with any  registration  of securities by American Mobile (whether or
not for its own account),  subject to certain Motorola priorities for sale under
the Participation Rights Agreement.

On March 22, 1999,  American Mobile and the Bank Facility  Guarantors  agreed to
amend the  Registration  Rights  Agreement to (1) extend the expiration date for
exercise of the demand registration rights granted thereunder to March 31, 2007,
(2) clarify that the rights provided in the  Registration  Rights  Agreement are
assignable  by the  Bank  Facility  Guarantors  provided  that  the  prospective
assignee  agrees  to  become  a party to that  agreement,  and (3)  provide  one
additional demand registration right that may be exercised only by Hughes or its
assignee.

On March 29, 1999,  the Bank  Facility  Guarantors  agreed to eliminate  certain
covenants  contained  in the  GIA  relating  to the  Company's  Earnings  Before
Interest,  Depreciation,  Amortization and Taxes ("EBITDA") and service revenue.
In exchange for this waiver,  the Company  agreed to amend the exercise price of
the Guarantee Warrants from $12.51 per share to $7.50 per share.

As a result  of the  automatic  application  of  certain  adjustment  provisions
following  the issuance of 7.0 million  shares of common stock in the  Company's
public offering in August 1999, the exercise price of the Guarantee Warrants was
further  reduced  to  $7.36  per  share,  and  the  Guarantee   Warrants  became
exercisable for an additional 129,246 shares.



                                       16
<PAGE>



Performance Graph

The graph set forth below shows the  cumulative  total  return to holders of the
Company's  common  stock from  December  31, 1994  through  December  31,  1999,
computed by dividing (1) 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 (2) 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, 1994 in the Company's  common stock
(at $20.50 per share), the Nasdaq U.S. index and the Nasdaq Telecom index.

               COMPARISON OF SIXTY MONTHS CUMULATIVE TOTAL RETURN

         [GRAPHIC OMITTED]
<TABLE>
<CAPTION>

                 Dec. '94   Dec. '95   Dec. '96   Dec. '97   Dec. '98   Dec. '99
                 --------   --------   --------   --------   --------   --------

<S>               <C>        <C>       <C>        <C>        <C>        <C>
American Mobile   100.000    103.395    81.199     37.358     38.338     69.004
Nasdaq US         100.000     99.597   127.981    155.959    233.293    358.852
Nasdaq Telecom    100.000    112.867   100.077    139.079    211.116    369.233
</TABLE>

                                       17

<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 four 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, 1999, 1998 and 1997 and (b) certain  information  relating to
options granted to such individuals.

Summary Compensation Table

<TABLE>

<CAPTION>

                                                                                                            All Other
                                       Annual Compensation                      Long-Term Compensation     Compensation
                                       -----------------------------------------------------------------  --------------
                                                                                              Securities
Name and                                             Other Annual       Restricted Stock      Underlying
Principal Position        Year      Salary  Bonus    Compensation(1)        Awards(2) $     Options/SARs(3)
- ------------------        ----      ------  -----    ---------------        -----------     ---------------

<S>                       <C>     <C>       <C>            <C>              <C>              <C>           <C>
Gary M. Parsons(4)        1999    $209,200  $168,438          $396                                             -
 Chairman of the Board    1998    $349,596  $158,000       $10,122          $985,555         100,000           -
                          1997    $317,692   $87,500       $10,122                           100,000           -

Robert L. Goldsmith(5)    1999    $243,624   $83,435        $1,062                            60,000           -
 Former Executive Vice    1998    $219,456   $76,406       $10,950          $665,250                           -
 President and Chief      1997    $189,807         -        $9,581                           100,000           -
 Operating Officer

Walter V. Purnell, Jr.(6) 1999    $275,600   $86,625          $639                           100,000       $101,912(7)
 President and Chief      1998    $172,258         -        $7,200          $709,600          80,000        $81,780(8)
 Executive Officer

Randy S. Segal            1999    $223,698   $68,847          $243                            50,000           -
 Senior Vice President,   1998    $204,216   $66,850        $9,904          $532,200               -           -
 General Counsel and      1997    $191,000   $52,716        $9,888                            25,000           -

W. Bartlett Snell(9)      1999    $172,615         -          $306          $188,800          40,000           -
 Vice President, Chief
 Financial Officer
</TABLE>

(1) For fiscal years 1997, 1998 and 1999, dollar amount includes group term life
insurance  premiums.  For fiscal year 1997,  dollar amount includes the personal
use of a company car and/or a car  allowance.

(2)As of December 31, 1999, the dollar value of restricted stock held by each of
Messrs.  Goldsmith,  Parsons,  Purnell and Snell and Ms.  Segal was  $1,037,500,
$2,305,553, $1,660,000, $830,000 and $830,000 respectively. The restricted stock
vests equally over three years and is subject to certain performance  conditions
that may be waived by the Board of Directors.

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

(4)Mr.  Parsons was Chief Executive  Officer and Chairman of the Board,  and Mr.
Purnell was President, during 1998. The principal positions indicated above were
effective January 1, 1999.

(5)Messrs.  Goldsmith  and Snell  joined the Company in February  1997 and March
1999, respectively.

(6)Mr. Purnell joined the Company in April 1998 upon the ARDIS Acquisition.

(7)Relates  to relocation  expenses.

(8)Relates to executive retirement plan pay-out.

                                         18

<PAGE>




The  following  table sets forth each grant of stock  options made during fiscal
year 1999 to each of the Named Executive Officers.


Option/SAR Grants in Last Fiscal Year
<TABLE>
<CAPTION>


                                                                                                Potential Realizable
                                          Individual Grants                                       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>       <C>
Robert L. Goldsmith ............    60,000          5.9449%     $5.18         Jan. 28, 2009       $195,460  $495,335
Gary M. Parsons ................    50,000          4.9541%     $5.18         Jan. 28, 2009       $162,884  $412,779
Walter V. Purnell, Jr. .........   100,000          9.9082%     $5.18         Jan. 28, 2009       $325,767  $825,559
Randy S. Segal         .........    50,000          4.9541%     $5.18         Jan. 28, 2009       $162,884  $412,779
W. Bartlett Snell       ........    40,000          3.9633%     $4.72         Mar. 16, 2009       $118,735  $300,899
</TABLE>

(1)Does not include  options granted on January 27, 2000, with respect to fiscal
year 1999. The numbers reflect the grant of options to purchase shares of common
stock under the Option 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.

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

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

                                                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....................                   399,334/150,666                         $3,545,048/$1,840,452
Walter V. Purnell, Jr..............                    26,667/153,333                           $316,804/$2,190,596
Robert L. Goldsmith................                    66,000/94,000                            $544,500/$1,214,700
Randy S. Segal ....................                   115,432/58,500                            $946,633/$845,990
W. Bartlett Snell..................                         0/40,000                                  $0/$641,200

(1) The Company has not granted SARs.
</TABLE>

                                       19

<PAGE>






              2.AMENDMENT TO THE COMPANY'S RESTATED CERTIFICATE OF
           INCORPORATION TO REMOVE THE REQUIREMENT OF A MINIMUM BOARD
                                      SIZE

On March 23, 2000, the Board of Directors approved an amendment to the Company's
Restated   Certificate   of   Incorporation   to  remove  the   Certificate   of
Incorporation's  requirement  of a  minimum  size for the  Board  of  Directors.
Instead  of  specifying  a minimum  Board  size,  the  Restated  Certificate  of
Incorporation,  as amended by the  proposed  amendment,  would  provide that the
Board shall have such number of  directors as may from time to time fixed by, or
in the manner provided in, the Company's Bylaws.

The Board of Directors concluded that the charter provision mandating a specific
minimum number of directors no longer serves a useful  purpose,  in light of the
Company's history and its current stockholder base. In its early life, both as a
privately held company and as a public company, the Company's outstanding shares
of Common Stock were closely held by a small number of stockholders.  Over time,
the Company's  stockholder  base has broadened  and  diversified  significantly.
Certain of the  Company's  historically  significant  stockholders  have reduced
their equity positions,  and the portion of the Company's outstanding stock held
by persons other than its original principal  stockholders has increased.  Also,
during this period certain of the Company's original principal stockholders have
either ceased to appoint representatives on the Company's Board of Directors, or
reduced  their  representation  significantly.  For  these  reasons,  the  Board
concluded  that  there is no  longer a need to retain  the  minimum  Board  size
requirement in the Company's Certificate of Incorporation.

Also, with the  fluctuation in the size of the Board in recent years,  the Board
believes it would be prudent to remove the  minimum  Board size  requirement  in
order to avoid the need to amend the Certificate of Incorporation  repeatedly in
future  periods to reduce the Board size. In addition,  the Board  believes that
the minimum Board size  provision is not customary for well  established  public
companies,  and, accordingly,  deems it advisable and appropriate to remove such
provision.

If this  amendment  is  approved,  the text of the first  sentence of the second
paragraph  of  Article  FIFTH  of  the   Company's   Restated   Certificate   of
Incorporation will be amended to read as follows:

         The number of directors shall be such number as from time to time shall
be fixed  by, or in the  manner  provided  in,  the  Bylaws of the  Corporation;
provided,  that no decrease in the number of directors  shall have the effect of
shortening the term of any incumbent director.

                                       20

<PAGE>




Recommendation and Vote Required

The affirmative  vote of the holders of two-thirds of the outstanding  shares of
common  stock is required to authorize  the  proposed  amendment to the Restated
Certificate of Incorporation.

The Board of Directors Recommends a Vote FOR Proposal 2.



              3.AMENDMENT TO THE COMPANY'S RESTATED CERTIFICATE OF
            INCORPORATION TO CHANGE THE REQUIREMENT FOR AMENDING THE
               CERTIFICATE OF INCORPORATION FROM TWO-THIRDS OF THE
            OUTSTANDING STOCK TO A MAJORITY OF THE OUTSTANDING STOCK

On March 23, 2000, the Board of Directors approved an amendment to the Company's
Restated Certificate of Incorporation to change the requirement for amending the
Certificate of Incorporation from a vote of two-thirds of the outstanding common
stock to a majority of the outstanding common stock.

The Board of Directors concluded that the charter provision regarding amendments
of the charter no longer serves its original purpose. In its early life, both as
a privately  held company and as a public  company,  the  Company's  outstanding
shares of Common Stock were closely held by a small number of stockholders. Over
time,   the  Company's   stockholder   base  has   broadened   and   diversified
significantly.  Certain of the Company's historically  significant  stockholders
have  reduced  their  equity  positions,   and  the  portion  of  the  Company's
outstanding stock held by persons other than its original principal stockholders
has increased,  and currently  exceeds 50% of the Company's  outstanding  common
stock. For these reasons,  the Board concluded that there is no longer a need to
retain the two-thirds  vote  requirement  for  amendments to the  Certificate of
Incorporation.

In addition,  the Board determined that the present  two-thirds  requirement for
charter amendments is not typical or customary for public companies incorporated
in Delaware. The Board believes that a two-thirds vote requirement could present
unnecessary  and/or unintended  obstacles to achieving  stockholder  approval of
charter  amendments  that may be in the best  interests  of the  Company and its
stockholders.

If this  amendment  is  approved,  the text of the  second  sentence  of Article
ELEVENTH of the Company's Restated  Certificate of Incorporation will be amended
to read as follows:


                                       21

<PAGE>



               This   Certificate  may  not  be  amended,   modified,   rendered
          ineffective  or  repealed  except  by the  vote  of the  holders  of a
          majority of the issued and outstanding shares of Common Stock.

Recommendation and Vote Required


The affirmative  vote of the holders of two-thirds of the outstanding  shares of
common  stock is required to authorize  the  proposed  amendment to the Restated
Certificate of Incorporation.

The Board of Directors Recommends a Vote FOR Proposal 3.



          4.AMENDMENT AND RESTATEMENT OF THE 1989 EMPLOYEE STOCK OPTION
             PLAN AS THE AMERICAN MOBILE SATELLITE CORPORATION STOCK
                                   AWARD PLAN

General

The Board of  Directors  has  approved  and  recommends  to the  stockholders  a
proposal to amend and restate the Option Plan as the "American  Mobile Satellite
Corporation   Stock  Award  Plan,"  with  such  amended  and  restated  Plan  to
incorporate  the  following  amendments:  (i)  an  increase  in  the  number  of
authorized  shares  available  for issuance  under the Option Plan to 7,300,000;
(ii)  broadening  the  eligibility  criteria to add  non-employee  directors and
consultants as eligible  participants under the Option Plan; (iii) expanding the
circumstances,  consistent  with current law and applicable  federal  securities
regulations, under which options may be transferred by the option holder, if the
Board or  Compensation  and  Stock  Option  Committee  chooses  to  permit  such
transfers in an optionee's  stock option  agreement;  (iv)  clarifying  that the
Company is authorized to make a variety of  stock-based  awards other than stock
options under the Option Plan; (v) extending the termination  date of the Option
Plan to January 27, 2010;  and (vi)  certain  other  amendments  of a conforming
and/or  technical  nature  intended to ensure that the Option Plan is consistent
with current laws and regulations applicable to such plans.

The foregoing  amendments  incorporated in the Option Plan are summarized below,
and the complete text of the Option Plan is included in this Proxy  Statement as
Annex  A.  The  summary  of the  amendments  is not  intended  to be a  complete
description of the  amendments,  and the summary is qualified in its entirety by
the actual text of the Option Plan to which reference is made.

The  amendments  included  within  Proposal  4 and  described  below will not be
effective

                                       22

<PAGE>



unless and until stockholder approval is obtained.


Summary of the Proposed Amendments and Reasons for the Amendments

This section  summarizes  the proposed  amendments to the Option Plan,  and also
describes the Board's reasons for adopting such amendments.

                                       23

<PAGE>



1.  Increase in Number of  Authorized  Shares Under  Option Plan.  The Board has
approved  an  increase in the number of shares of common  stock  authorized  for
issuance under the Option Plan from 5,500,000 to 7,300,000

As of March 31, 2000,  option grants and  restricted  stock awards for 4,455,604
shares were granted and outstanding,  and 994,771 options had been exercised. In
the absence of an amendment to increase  the number of shares  authorized  under
the plan, there would be only 155,410 shares remaining available for grant under
the plan.  If Proposal 4 is adopted,  there will be  1,955,410  shares of common
stock available for grant under the Option Plan.

The Company uses stock  option  grants as an integral  part of its  compensation
program for executives and employees. By doing so, the Company believes it links
compensation throughout the organization to the Company's performance. The Board
believes  that  this  program  has been an  important  factor  in the  Company's
attracting  and  retaining  employees of  outstanding  ability and promoting the
identification  of  such  employees'  interests  with  those  of  the  Company's
stockholders.  For these  reasons,  the Board believes that it is appropriate to
continue  such  practice  in the future  through the use of stock  options.  The
Company  has  granted  options  under the Option  Plan at a faster  rate than it
originally  expected to do when  shareholders  last  approved an increase in the
number  of  authorized  shares  in  1998,  primarily  because  of the  Company's
continued growth and the significant increase in Company employees following the
acquisition  of ARDIS in March  1998.  In  addition,  as  described  above under
"Compensation  and Stock Option Committee  Report," the Board has made grants of
Performance Options to key employees,  in addition to traditional option grants.
The  Board  believes  that  additional  shares of  common  stock  should be made
available  under  the  Option  Plan to  facilitate  the  continued  use of stock
options,  as well as other stock-based  awards, as part of the Company's overall
incentive compensation program.

2. Adding Non-Employee Directors and Consultants as Eligible  Participants.  The
Board has  approved  an  amendment  to broaden the  eligibility  criteria in the
Option  Plan  to  permit  awards  to  be  made  to  non-employee  directors  and
consultants, as well as employees.

Currently, non-employee directors of the Company are eligible to receive options
pursuant to the terms of the Director Plan. As of March 31, 2000,  option grants
for 95,000 shares were granted and  outstanding  under the Director Plan, and no
options had been  exercised.  In the absence of the amendments  included  within
Proposal 4, there would be only 5,000 shares remaining available for grant under
the Director Plan.

The Company  originally  adopted the Director  Plan as a separate plan to ensure
that options granted to non-employee  directors  satisfied certain  requirements
under  Section  16 of the  Securities  Exchange  Act of 1934,  as  amended  (the


                                       24

<PAGE>


"Exchange  Act"),  and the rules and  regulations  thereunder  (the  "Section 16
Rules").  In light of recent amendments to the Section 16 Rules, the Company has
determined  that it is no longer  required  to  maintain  a  separate  plan with
respect to option grants for non-employee  directors.  The Company believes that
it can satisfy  compliance with the Section 16 Rules and other  applicable laws,
rules  and  regulations  by  making  grants  of stock  options  to  non-employee
directors  under the terms of a single plan  governing  awards to employees  and
non-employee  directors,  the  Option  Plan.  The  Company  intends  to use  the
remaining  authorized  shares  under the  Director  Plan,  and then begin  using
available shares under the Option Plan, in making future awards of stock options
to  non-employee  directors.  The Company  believes that its continued  grant of
options  to  non-employee  directors  will  help to  promote  ownership  by such
non-employee directors of a greater proprietary interest in the Company, thereby
aligning  such  directors'  interests  more closely with those of the  Company's
stockholders.  The Company also believes that its ability to grant stock options
to non-employee  directors will assist it in attracting,  and retaining,  highly
qualified individuals to serve as non-employee directors.

The Board  also  believes  that it is  appropriate  to broaden  the  eligibility
criteria under the Option Plan to permit  consultants  engaged in efforts on the
Company's  behalf to be  eligible  to receive  awards of stock  options or other
stock-based  awards,  if the Board or  Compensation  and Stock Option  Committee
deems it  appropriate  and in the  best  interests  of the  Company.  The  Board
believes  that the  flexibility  to make such  awards will assist the Company in
attracting  and  retaining  non-employee  consultants,  and in  motivating  such
consultants to perform to the best of their abilities.

3. Expansion of Permitted Transfers of Stock Options.  The Board has approved an
amendment  to  expand  the  circumstances,   consistent  with  current  law  and
applicable   federal  securities   regulations,   under  which  options  may  be
transferred by the option holder,  if the Board or Compensation and Stock Option
Committee elects to permit such transfers in optionees'  individual stock option
agreements.  Specifically,  under the amendments approved by the Board,  options
could be  transferred,  in  transactions  not for value,  to  specified  "family
members" (as defined in the Option Plan),  provided that the individual's option
agreement permits such transfers.



                                       25

<PAGE>



Currently,  the Option Plan  permits the  transfer of options only upon death or
pursuant to a qualified  domestic  relations order.  The expanded  circumstances
under which options may be  transferred  is intended to facilitate  individuals'
estate planning. The Board adopted these changes so that the Company can, in its
discretion,  elect to permit such  transfers  for specific  option  grants.  The
expansion of  circumstances  in which options may be  transferred  is consistent
with recent changes in securities  laws and related rules and  regulations,  and
the Board believes that it is  appropriate  for the Option Plan to be consistent
with such current laws, rules and regulations, in order to allow the Company the
maximum flexibility in administering the Option Plan.

4. Clarification of Permitted Types of Awards Under Plan. The Board has approved
certain amendments of language to clarify that the Company may make a variety of
stock-based  awards to eligible  participants under the Option Plan, in addition
to stock options.  Specifically,  the Board has added language  clarifying  that
participants may be awarded restricted stock, stock appreciation rights, phantom
shares,  or other  similar  stock-based  awards,  in addition to grants of stock
options.  The Board  believes that these  amendments  merely  clarify the Option
Plan's  existing  terms,  which permit the award of "Bonus  Stock." To date, the
only types of  stock-based  awards that have been made other than stock  options
are awards of restricted stock.  However,  the Board believes that it is prudent
to clarify that the Company has the  flexibility  to design a variety of similar
stock-based  award  programs,  in its  discretion,  in order to  accomplish  the
Company's  objective of ensuring  that its  stock-based  incentive  compensation
programs adequately incentivize its employees.

5. Extension of Termination  Date to January 27, 2010. The Board has approved an
amendment extending the termination date of the Option Plan to January 27, 2010,
which is ten years from the date the Board  adopted  such  amendment.  The Board
believes  that it is  prudent  and  appropriate  to  extend  the  Option  Plan's
termination  date for ten years, to January 27, 2010, to avoid  interruptions or
complications  that might arise in 2003,  the current  termination  date, in the
absence of shareholder  approval to extend the Plan's  termination  date at that
time.


Summary of the Option Plan

Set forth  below is a summary  of the  principal  terms of the Option  Plan,  as
proposed  for  amendment.  The  complete  text of the Option Plan is included as
Annex  A.  The  summary  set  forth  below  is  not  intended  to be a  complete
description  of the Option Plan, and the summary is qualified in its entirety by
the actual text of the Option Plan to which reference is made.


                                       26
<PAGE>



Unless sooner  terminated  by the Board,  the Option Plan will expire on January
27, 2010. Such  termination  will not affect the validity of any option grant or
stock award outstanding on the date of termination.


                                       27

<PAGE>



The  Option  Plan is  administered  by a  committee  comprised  of at least  two
non-employee directors of the Company, or, alternatively, may be administered by
the  Board.  Subject  to the terms  and  conditions  of the  Option  Plan,  such
committee,  or the Board, has the authority to select the persons to whom grants
of options or other  stock-based  awards 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 Option Plan.

Subject  to  the  terms  and  conditions  of  the  Option  Plan,  the  committee
administering  the  Option  Plan,  or the  Board,  may  modify,  extend or renew
outstanding  options,  or accept the surrender of  outstanding  options  granted
under the Option  Plan or under any other  stock  option plan of the Company and
authorize  the  granting  of  new  options   pursuant  to  the  Option  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 Option Plan.

The Option Plan may be amended by the Board,  subject to stockholder approval if
such approval is then required by applicable law.

Stock  options  and other  stock-based  awards  may be  granted  or  awarded  to
employees of the Company, consultants, and non-employee directors. A participant
may receive more than one option or award  provided that no  participant  may be
granted options or other stock-based  awards under the Option Plan covering more
than 50% of the shares of Common Stock  reserved  for issuance  under the Option
Plan as set forth above.

Stock options  granted under the Option 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 Option 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  discretion  of the  administering  committee or Board of
Directors  as to the  terms of stock  options  granted  in  accordance  with the
provisions of the Option Plan,  options  granted under the Option 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  committee
administering the Option Plan may in its discretion provide that options granted
under the Option 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.

                                       28

<PAGE>



The Option 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 Option Plan also provides,  unless  otherwise set forth in an
option agreement, for satisfaction of an optionee's or grantee's tax liabilities
arising in connection  with the Option Plan through  retention by the Company of
shares of Common Stock issuable upon the exercise of a nonstatutory stock option
or pursuant to another stock-based award or through delivery of shares of Common
Stock to the Company subject to the terms and conditions set forth in the Option
Plan and  under  such  other  terms  and  conditions  as set  forth in an option
agreement.

Unless provided  otherwise in an option  agreement,  in the case of transfers to
certain  family members of the optionee,  options  granted under the Option 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 Internal Revenue 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.

Stock-based awards other than options may also be awarded under the Option Plan.
A stock-based  award  consists of shares of Common Stock that may be issued from
time to time under such conditions (if any) that the committee administering the
Option Plan, or the Board,  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.

Certain Federal Income Tax Matters

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. The Company generally will be entitled to a deduction
in the amount of ordinary  income so recognized,  subject to satisfying  certain
income tax reporting requirements.


                                       29

<PAGE>



A grantee who receives a stock-based  award 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 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  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  generally  will be entitled  to a  deduction  in the amount of ordinary
income so  recognized,  subject  to  satisfying  certain  income  tax  reporting
requirements.

The rules governing the tax treatment of options and stock-based  awards, 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.


Section 162(m) of the Internal Revenue Code

The Board of  Directors  and the members of its  Compensation  and Stock  Option
Committee believe that, as a matter of general policy,  the Company's  incentive
compensation  plans should be structured to facilitate  compliance  with Section
162(m) of the Internal Revenue Code ("Section 162(m)"). Section 162(m) generally
disallows  a  public  company's  tax  deduction  in  excess  of $1  million  for
compensation  to its chief  executive  officer  and the four other  most  highly
compensated  executive officers,  subject to an exception for  performance-based
compensation.  Options  granted  under a  shareholder-approved  plan such as the
Option Plan  generally  qualify for the  performance-based  exception to Section
162(m).  However, the Board and the Compensation and Stock Option Committee also
believe that the  Compensation  and Stock Option  Committee  should  reserve the
right to establish  other  incentive  compensation  arrangements  for  otherwise
covered  executive  officers  that may not  comply  with  Section  162(m)  if it
determines, in its sole discretion, that to do so would be in the best interests
of the Company and its stockholders

Vote Required

The  affirmative  vote of a majority  of the shares of common  stock  present in
person or  represented  by proxy and  entitled to vote at the annual  meeting is
required to approve the amendments incorporated within the Option Plan.


                                       30

<PAGE>



The  Board  of  Directors  unanimously  recommends  that  stockholders  vote FOR
approval of Proposal 4.


                                 5.AMENDMENT OF
                          EMPLOYEE STOCK PURCHASE PLAN
                     TO INCREASE NUMBER OF AUTHORIZED SHARES

General

On January  27,  2000,  the Board of  Directors  approved  an  amendment  to the
Company's  Employee Stock  Purchase Plan (the  "Purchase  Plan") to increase the
number of shares of Common Stock  authorized  for issuance  under such plan from
300,000 to 600,000.

The Board  concluded  that this  increase in the number of shares  available for
issuance  under the  Purchase  Plan was  necessary in order to have a sufficient
number of shares  available  for issuance to employees  who  participate  in the
Purchase  Plan.  This  increase is necessary  for several  reasons.  First,  the
Purchase Plan has not been increased since it was first adopted in 1993. Second,
the number of people employed by the Company has grown  significantly  since the
Purchase Plan was first  adopted,  especially as a result of the  acquisition of
ARDIS  in  1998.  This  has  resulted  in a  greater  number  of  Purchase  Plan
participants.  In addition,  during 1998 and 1999 the Company's  relatively  low
stock price resulted in a greater number of shares being issued  pursuant to the
Purchase Plan than in prior periods.  For all these reasons,  the Board believes
it is appropriate to increase the number of shares  available under the Purchase
Plan.  The Board  considers  the Purchase  Plan,  like the Option Plan, to be an
important attraction for prospective  employees and a valued benefit of existing
employees.


Summary of the Purchase Plan

The Purchase Plan is designed to encourage  employee ownership of the Company by
offering  eligible  employees  an  opportunity  to  purchase  Common  Stock at a
discount through payroll deductions.

The minimum amount that  employees can contribute  under the Purchase Plan is 1%
of their  "eligible  compensation",  but no less than $5.00 per pay period.  The
maximum amount they can  contribute is $21,250 per calendar year.  Employees may
elect to deduct  either a percentage of their  bi-weekly  pay, or a fixed dollar
amount. "Eligible compensation" is base pay, overtime, bonuses, and commissions.

The  price  used to buy stock is equal to 85% of the  lesser of the fair  market
value on the  first  day and the  last day of each  purchase  period  under  the
Purchase Plan.

                                       31

<PAGE>




If there is an insufficient  number of unsold shares in any purchase period that
may be made available for purchase under the Purchase Plan to permit exercise of
all rights deemed  exercised by participating  employees,  an adjustment will be
made, and the number of shares  purchasable by all participants  will be reduced
proportionately.  Any funds then  remaining in  participants'  accounts  will be
refunded to participants.

In any calendar year, no employee may purchase  shares of American  Mobile stock
having an aggregate  fair market value over  $25,000,  determined,  as to shares
purchased during each purchase period in such calendar year, as of the first day
of such purchase period.  The Board of Directors may modify the Purchase Plan in
any  respect,  but must obtain the approval of a majority of the votes cast at a
duly held meeting of American  Mobile's  stockholders for any modification  that
(i) changes the  requirements  as to the eligibility  for  participation  in the
Purchase  Plan;  (ii) increases the maximum number of shares subject to purchase
under  the  Purchase  Plan,  unless  such  increase  results  from a  change  in
capitalization,  or (iii) materially increases the benefits accruing to Purchase
Plan participants. After giving effect to the proposed amendment, 600,000 shares
of common stock shall be authorized to be issued under the Purchase Plan.


Certain Federal Income Tax Matters

The Purchase Plan is intended to qualify as an "employee  stock  purchase  plan"
under  Section 423 of the  Internal  Revenue Code of 1986,  as amended.  Amounts
withheld from pay under the Purchase Plan will be taxable income to employees in
the year in which the amounts otherwise would have been received,  but employees
will not be  required to  recognize  additional  income for  federal  income tax
purposes either at the time such employee is deemed to have been granted a right
to  purchase  common  stock (on the first day of a purchase  period) or when the
right to  purchase  common  stock is  exercised  (on the last day of a  purchase
period).

If an employee holds the common stock  purchased  under the Purchase Plan for at
least two years  after the first day of the  purchase  period in which the stock
was  purchased  (the "Grant  Date"),  when the  employee  disposes of the common
stock, he or she will recognize as ordinary income an amount equal to the lesser
of (a) 15% of the fair market value of the common stock on the Grant Date or (b)
the  excess  of the  fair  market  value  of the  common  stock  on the  date of
disposition  over the price paid for the stock.  If an employee  disposes of the
common  stock  within two years after the Grant Date,  he or she will  recognize
ordinary  income  equal to the fair market value of the common stock on the last
day of the purchase period in which the stock was acquired (the "Purchase Date")
less the amount paid for the common stock.

                                       32

<PAGE>



Upon an employee's  disposition  of the common stock acquired under the Purchase
Plan, any gain realized in excess of the amount reported as ordinary income will
be reportable by the employee as a capital gain, and any loss will be reportable
as a capital  loss.  Amounts  required to be reported as ordinary  income on the
disposition  of  the  common  stock  may  be  added  to the  purchase  price  in
determining any remaining capital gain or loss. American Mobile will not receive
any  deduction  for federal  income tax  purposes  with  respect to common stock
purchased under the Purchase Plan and held for the two year holding period. With
respect to stock purchased under the Purchase Plan and held less than two years,
American  Mobile  would be  entitled to a  deduction  in an amount  equal to the
amount that is considered ordinary income.  Otherwise,  the Purchase Plan has no
tax effect on American Mobile.

Recommendation and Vote Required

The  affirmative  vote of a majority  of the shares of Common  Stock  present in
person or  represented  by proxy and  entitled to vote at the annual  meeting is
required to approve the amendment to the Employee Stock Purchase Plan.

  The Board of Directors Recommends a Vote FOR Proposal 5.


                  6.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 2000,  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 or she so
desires and to respond to appropriate questions.

The Board of Directors  unanimously  recommends a vote FOR  ratification  of the
appointment of Arthur  Andersen LLP as independent  accountants  for the Company
for the year 2000.




                                       32

<PAGE>

             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 (the "SEC") and the National Association of Securities Dealers,  Inc.
Specific due dates for these reports have been established by the Securities and
Exchange  Commission  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 1999.  XM Ventures  was late in filing on Form 4 the sale of
95,000 shares of American  Mobile common stock.  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.


                                  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 THE COMPANY'S ANNUAL MEETING IN 2001

The Company will review for inclusion in next year's proxy statement stockholder
proposals  received  by  December  21,  2000.  Proposals  should  be sent to the
Secretary  of  the  Company,   10802  Parkridge  Boulevard,   Reston,   Virginia
20191-5416.  In order to be  included  in the proxy  statement  for next  year's
annual meeting,  such proposals must comply with all of the requirements of Rule
14a-8 under the Securities Exchange Act of 1934 (the "Exchange Act").


                                       33

<PAGE>



A stockholder who wishes to submit a proposal for inclusion in next year's proxy
statement,  outside the processes of Rule 14a-8 under the Exchange Act, must, in
accordance with Article II, Section 13 of the Company's By-Laws,  file a written
notice with the Secretary of the Company which conforms to the  requirements  of
the By-Laws. 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
By-Laws 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 By-Laws.  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 2001  (unless  such
notice  relates to a special  meeting or the annual meeting is called to be held
before the date specified in the By-Laws, 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).  Any stockholder
proposal that is not submitted in accordance with the foregoing  procedures will
not be considered to be properly brought before the 2001 annual meeting, and, if
presented  at the meeting,  the Company will be able to use proxies  given to it
for such meeting to vote for or against any such proposal at the Company's  sole
discretion.


                               1999 ANNUAL REPORT

American  Mobile's Annual Report to Stockholders for the year ended December 31,
1999,  including  financial  statements  ("Annual  Report"),  is being furnished
concurrently  with this Proxy  Statement  to persons  who were  stockholders  of
record as of March 31, 2000, the record date for the Annual Meeting.

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

Reston, Virginia
April 19, 2000



                                     34

<PAGE>

                                     ANNEX A

[GRAPHIC OMITTED]


                      AMERICAN MOBILE SATELLITE CORPORATION
                                STOCK AWARD PLAN
              As Amended and Restated To Be Effective May 23, 2000



1.       Definitions

         In this  Plan,  except  where  the  context  otherwise  indicates,  the
following definitions apply:

         A.     "Agreement" means a written agreement implementing a grant of an
                Optionor a Stock-Based Award.

         B.     "Board" means the Board of Directors of the Corporation.

         C.     "Code" means the Internal Revenue Code of 1986, as amended.

         D.     "Committee"  means a committee  of, and designated from  time to
                time by  resolution  of, the Board,  which  shall consist of  no
                fewer than two members of the Board,  none of  whom shall be  an
                officer  or other  salaried  employee  of  the  Company  or  any
                affiliate of the Company.

         E.     "Common Stock" means the common stock, par value $.01 per share,
                of the Corporation.

         F.      "Consultant"  means  an  individual  or  entity  who  is  in  a
                 consulting  relationship with the Corporation or any Subsidiary
                 of the Corporation.

         G.     "Corporation" means AMERICAN MOBILE SATELLITE CORPORATION.

         H.     "Date of  Exercise"  means  the date on  which  the  Corporation
                receives  notice of  the  exercise  of  an Option in  accordance
                with the terms of Article 7.

         I.     "Date of  Grant"  means  the  date  as of  which  an  Option  is
                granted or a Stock- Based  Award  is authorized by the action of
                the  Committee,  or such  later date  as may be specified in the
                authorization.

         J.     "Employee" means any person determined by the Committee to be an
                employee of the Corporation or of a Subsidiary.



<PAGE>



         K.     "Exchange  Act"  means  the  Securities  Exchange  Act  of 1934,
                as amended,  and the rules and  regulations  thereunder.

         L.     "Fair Market Value"  of  a  Share  means the amount equal to the
                average of the highand low  prices of a Share on the  applicable
                date as  reported  by  the  consolidated  tape  of  the National
                Association  of Securities  Dealers  Automated  Quotation (or on
                such other recognized  quotation  system on  which  the  trading
                prices of the Common Stock are  quoted on the applicable  date),
                or, if no Share  transactions are reported on such tape (or such
                other system) on the  applicable  date, the high and low  prices
                of a  Share on the  immediately  preceding  date on which  Share
                transactions  were   so  reported,  or  as  determined  pursuant
                to  a  reasonable  method  adopted  by  the  Committee  in  good
                faith for such purpose.

         M.     "Grantee" means a  Participant  to  whom a Stock-Based Award has
                been granted.

         N.     "Insider"  means an  Optionee or Grantee who  is  subject to the
                reporting  requirements   under  Section  16(a) of  the Exchange
                Act.

         O.     "Non-Employee Director" means a member of the Board who  is  not
                an employee of the Corporation.

         P.     "Option"  means  an option to purchase  Shares granted under the
                Plan in accordance with the terms of Article 6.

         Q.     "Option Period" means  the  period during which an Option may be
                exercised.

         R.     "Option  Price"  means  the  price  per Share at which an Option
                may be exercised.  The Option Price  shall  not be less than the
                greater  of the Fair Market  Value  per Share  determined  as of
                the Date of Grant or the par value of the Common Stock.

         S.     "Optionee"  means  a Participant to  whom  an  Option  has  been
                granted.

         T.     "Participant"  means  any  Employee, Consultant, or Non-Employee
                Director participating under the Plan.

         U.     "Plan"  means  this  AMERICAN MOBILE SATELLITE CORPORATION Stock
                Award Plan, as the same shall be amended, revised, or terminated
                from time to time.

         V.     "Reload Option"  means a  new Option granted to an Optionee upon
                the  surrender of Shares to pay the Option Price of a previously
                granted Option.  The Option Price  for  any  Reload Option shall




<PAGE>



                not  be less  than  the greater of  the Fair  Market  Value of a
                Share on the date that Shares are  surrendered in payment of the
                Option Price in accordance with Section  3.A(d) or the par value
                of the Common  Stock.  Other terms of the  Reload  Option  shall
                be the same as the  terms contained in the Optionee's  Agreement
                relating to the Option being exercised.

         W.     "Share" means a share of Common Stock.

         X.     "Stock-Based Award" means  any award, other than the grant of an
                Option,  to  a  Participant  of  any  stock-based  instrument in
                accordance  with  Article  9  of  the  Plan,  including, but not
                limited to, the award of restricted stock, unrestricted   stock,
                stock appreciation rights, and phantom shares.

         Y.     "Subsidiary"  means a corporation at least  50%  of  the   total
                combined  voting power of all classes of stock of which is owned
                by  the  Corporation  either  directly  or  through  one or more
                Subsidiaries.

         Z.     "Withholding  Tax  Liabilities" means the Corporation's federal,
                state and any local  income  tax  and  payroll  withholding  tax
                obligations  arising  in  connection  with  the  exercise  of an
                Option  or  the grant of a  Stock-Based  Award (or  issuance  of
                underlying  Shares) under  the Plan. Withholding Tax Liabilities
                does not include the Corporation's share of any payroll taxes.


2.       Purpose

The Plan is  intended  to  promote  the  success  and  enhance  the value of the
Corporation by linking the personal  interests of  Participants  to those of the
Corporation's  shareholders by providing the Participants  with an incentive for
outstanding performance.  The Plan is further intended to assist the Corporation
in its ability to motivate,  and retain the services of, Participants upon whose
judgment,  interest and special effort the successful  conduct of its operations
is largely dependent.


3.       Administration

         The  Plan  shall  be  administered  by the  Committee,  but may also be
administered  by the  Board.  In  addition  to any other  powers  granted to the
Committee, it shall have the following powers, subject to the express provisions
of the Plan:

                  A.       subject to the  provisions of this Plan, to determine
                           in its  discretion the  Participants  to whom Options
                           shall be granted and to whom Stock-Based Awards shall
                           be made,  the  number of Shares to be subject to each
                           Option or Stock-Based Award, and the terms upon which
                           Options  may  be acquired and exercised and the terms
                           and conditions of Stock-Based Awards;



<PAGE>


                  B.       to  determine  all other terms and provisions of each
                           Agreement, which need not be identical;

                  C.       without limiting the  generality of the foregoing, to
                           provide in its discretion in an Agreement:

                           a. for  an  agreement  by  the  Optionee  or  Grantee
                              to  render services to the  Corporation  upon such
                              terms and conditions as  may be  specified  in the
                              Agreement,  provided  that the Committee shall not
                              have the power to commit the Corporation to employ
                              or otherwise retain any Optionee or Grantee;

                           b. for  restrictions  on  the transfer, sale or other
                              disposition of Shares issued to the Optionee  upon
                              the  exercise  of  an  Option  or  for  other
                              restrictions  permitted  by Article 9 with respect
                              to Stock-Based Awards;

                          c.  for  an  agreement  by  the Optionee or Grantee to
                              resell   to  the  Corporation,   under   specified
                              conditions,  Shares issued  upon the  exercise  of
                              an Option or awarded  pursuant  to  a  Stock-Based
                              Award;

                          d.  for  the right of the Optionee to surrender to the
                              Corporation an  Option  (or  a  portion   thereof)
                              that  has become exercisable and receive upon such
                              surrender, without any payment to the  Corporation
                              or a  Subsidiary (other than amounts  necessary to
                              satisfy  Withholding Tax Liabilities with  respect
                              to the Option)  that number of Shares  (equal   to
                              the  highest  whole  number  of  Shares) having an
                              aggregate  Fair  Market  Value  as  of the date of
                              surrender  equal to that  number of Shares subject
                              to   the   Option  (or   portion   thereof)  being
                              surrendered  multiplied by an amount equal  to the
                              excess of (i) the Fair  Market Value of a Share on
                              the date of surrender over (ii) the Option  Price,
                              plus   an   amount  of  cash  equal  to  the  Fair
                              Market Value of any fractional  Share to which the
                              Optionee  might  be entitled; any  such  surrender
                              shall be treated as the exercise of the Option (or
                              portion thereof); and


                         e.   for  the  automatic  issuance  of  a Reload Option
                              covering a number of Shares equal to the number of
                              any Shares used to pay the Option Price;

                  D.     to construe and interpret the Agreements and the Plan;




<PAGE>

                  E.     to  require,  whether   or  not  provided  for  in  the
                         pertinent   Agreement, of  any   person  exercising  an
                         Option or acquiring Shares  pursuant to  a  Stock-Based
                         Award, at the time of  such  exercise  or  acquisition,
                         the making of any  representations or agreements  which
                         the Committee may deem  necessary or advisable in order
                         to comply with the securities laws or the United States
                         or of any state; and

                  F.     to  make  all  other  determinations and take all other
                         actions  necessary  or advisable for the administration
                         of the Plan.

     Any  determinations  or actions made or taken by the Committee  pursuant to
this Article shall,  subject to the express  provisions of this Plan, be binding
and final.


4.       Eligibility

     Options and Stock-Based  Awards may be granted only to (i) Employees,  (ii)
Consultants,  and (iii)  Non-Employee  Directors.  Subject to the limitations of
Section 5.A, a Participant  who has been granted an Option or Stock-Based  Award
may be granted additional Options or Stock-Based Awards.

5.       Stock Subject to the Plan

         A.         Subject  to   adjustment  as  provided  in  Article  11,  an
                    aggregate  of  7,300,000  authorized  and  unissued  Shares,
                    reissued  treasury Shares,  or Shares otherwise  acquired by
                    the  Corporation,  may be  issued  under  the Plan  upon the
                    exercise  of  Options or  pursuant  to  Stock-Based  Awards,
                    provided,  however,  that no Employee may be granted Options
                    and Stock-Based  Awards covering more than 50% of the number
                    of Shares issuable under the Plan.

         B.         If an Option  expires or terminates  for any reason  without
                    having been fully  exercised,  or if Stock-Based  Awards (or
                    Shares   underlying   such   awards)  are   forfeited,   the
                    unpurchased  Shares  which had been subject to the Option at
                    the time of its expiration or termination,  or the forfeited
                    Stock-Based Awards (or Shares underlying such awards), shall
                    become  available  for the grant of other Options or for the
                    award of additional  Stock-Based Awards,  provided,  that in
                    the case of forfeited  Shares and to the extent necessary to
                    satisfy the provisions of Rule 16b-3 under the Exchange Act,
                    the Grantee has  received no dividends  prior to  forfeiture
                    with respect to such Shares.


6.       Options

         A.         Subject to the  provisions  of this Plan,  the  Committee is
                    hereby authorized to grant Options to Participants.



<PAGE>


         B.         All  Agreements  granting  Options shall contain a statement
                    that the  Option  is  intended  to be a  nonstatutory  stock
                    option  and not an  incentive  stock  option as  defined  in
                    section 422 of the Code.

         C.         The Option  Period shall be  determined by the Committee and
                    specifically set forth in the Agreement,  provided, however,
                    that an Option  shall not be  exercisable  before six months
                    from the Date of Grant (except that this limitation need not
                    apply in the event of the death of the  Optionee  within the
                    six-month  period) and no Option shall be exercisable  after
                    ten years after the Date of Grant.

         D.         By  accepting  the grant of an Option  under the Plan,  each
                    Optionee agrees, for the Optionee and his or her successors,
                    that the  Option may not be  exercised  at any time that the
                    Corporation does not have in effect a registration statement
                    under the  Securities  Act of 1933, as amended,  relating to
                    the offer of Common  Stock to the  Optionee  under the Plan,
                    unless the Corporation  agrees to permit such exercise,  and
                    that,  upon the  issuance of any Shares upon the exercise of
                    the  Option,  the  Optionee  will,  upon the  request of the
                    Corporation,  agree in writing  that he or she is  acquiring
                    such  Shares  for  investment  only  and not  with a view to
                    resale,  and  that  he or  she  will  not  sell,  pledge  or
                    otherwise  dispose of such Shares so issued unless and until
                    (i) the  Corporation is furnished with an opinion of counsel
                    to the effect that  registration  of such Shares pursuant to
                    the Securities  Act of 1933, as amended,  is not required by
                    that Act and the rules and regulations thereunder;  (ii) the
                    staff of the Securities and Exchange Commission has issued a
                    "no-action"  letter  with  respect to such  disposition;  or
                    (iii)  such  registration  or  notification  as  is,  in the
                    opinion of counsel  for the  Corporation,  required  for the
                    lawful  disposition  of such  Shares  has been  filed by the
                    Corporation  and has become  effective;  provided,  however,
                    that the Corporation shall not be obligated to file any such
                    registration or notification. The Option shall further agree
                    that  the  Company  may  place  a  legend   embodying   such
                    restriction on the certificates evidencing such shares.

         E.         All other terms of Options  granted  under the Plan shall be
                    determined  by the  Committee  in its  sole  discretion,  as
                    exercised  consistently  with  the  terms of the  Plan,  and
                    specifically  set  forth in the  Optionee's  agreement.  Any
                    terms of Options  determined by the Committee that vary from
                    the  express  terms  set  forth  in the Plan  also  shall be
                    specifically set forth in the Optionee's Agreement.


7.       Exercise

         A.         An Option may,  subject to the  provisions  of the Agreement
                    under which it was granted, be exercised in whole or in part
                    by the delivery to the  Corporation of written notice of the
                    exercise,  in such  form  as the  Committee  may  prescribe,
                    accompanied  by full  payment  of the  Option  Price for the
                    Shares  with  respect  to which the Option is  exercised  in
                    accordance  with  Section 7.B,  and by  satisfaction  by the
                    Optionee of Withholding  Tax  Liabilities in accordance with
                    Article 10.




<PAGE>




         B.         The Option Price may be paid in the form of (i) cash,  which
                    may  include  an  assignment  of the right to  receive  cash
                    proceeds of the sale of Common  Stock  subject to the Option
                    pursuant to a "cashless  exercise"  of the Option  through a
                    transaction with a broker,  (ii) duly endorsed  certificates
                    representing Shares (other than Shares that are subject to a
                    substantial  risk of forfeiture)  having a Fair Market Value
                    on the  Date of  Exercise  aggregating  not  more  than  the
                    portion of the Option  Price  being paid by delivery of such
                    Shares  (which  Shares,  if acquired  from the  Corporation,
                    shall  have been held for at least six  months),  or (iii) a
                    combination  of cash and  Shares  as  provided  in  Sections
                    7.B(i) and (ii).

         C.         To   the   extent   required   to   comply   with   Treasury
                    Regulationss.1.401(k)-1(d)(2)(iv)(B)(4), or any amendment or
                    successor  thereto,  an  Optionee's  "elective  and employee
                    contributions"   (within  the   meaning  of  such   Treasury
                    Regulation)  under the Plan shall be suspended  for a period
                    of twelve  months  following  such  Optionee's  receipt of a
                    hardship  distribution  made in  reliance  on such  Treasury
                    Regulation  from  any  plan  containing  a cash or  deferred
                    arrangement  under Section 401(k) of the Code  maintained by
                    the  Corporation or a related party within the provisions of
                    subsections (b), (c), (m) or (o) of Section 414 of the Code.


8.       Nontransferability

          A.        Except to the extent provided in Section 8.B below,  Options
                    granted under the Plan shall not be  transferable  otherwise
                    than (a) by will or the laws of descent and distribution, or
                    (b)  pursuant to a  qualified  domestic  relations  order as
                    defined  in  Section  414(p)  of the  Code or Title I of the
                    Employee   Retirement  Income  Security  Act  or  the  rules
                    thereunder,  and an  Option  may be  exercised,  during  the
                    Optionee's lifetime, only by the Optionee or, in the case of
                    the Optionee's  legal  disability,  by the Optionee's  legal
                    representative.

         B.         If authorized in the applicable  Agreement,  an Optionee may
                    transfer,  not for  value,  all or part of an  Option to any
                    Family  Member (as  defined in this  Section  8.B).  For the
                    purpose of this Section 8.B, a "not for value" transfer is a
                    transfer  which  is (i) a  gift,  (ii) a  transfer  under  a
                    domestic  relations order in settlement of marital  property
                    rights;  or (iii) a transfer to an entity in which more than
                    fifty  percent of the voting  interests  are owned by Family




<PAGE>


                    Members (or the  Optionee)  in  exchange  for an interest in
                    that entity.  Following a transfer  under this Section 8.B),
                    any such  Option  shall  continue  to be subject to the same
                    terms and conditions as were applicable immediately prior to
                    transfer.  Subsequent  transfers of transferred  Options are
                    prohibited except to Family Members of the original Optionee
                    in  accordance  with this Section 8.B or by will or the laws
                    of descent and  distribution.  The events of  termination of
                    employment  or  other  relationship  shall  continue  to  be
                    applied  with respect to the  original  Optionee,  following
                    which the Option shall be exercisable by the transferee only
                    to the extent, and for the periods specified with respect to
                    the original Optionee.  For purposes of Section 8.B, "Family
                    Member"  means a person who is a spouse,  child,  stepchild,
                    grandchild, parent, stepparent, grandparent, sibling, niece,
                    nephew,    mother-in-law,     father-in-law,     son-in-law,
                    daughter-in-law, brother-in-law, or sister-in-law, including
                    adoptive relationships,  of the Optionee, any person sharing
                    the Optionee's  household (other than a tenant or employee),
                    a trust in which these  persons have more than fifty percent
                    of the  beneficial  interest,  a  foundation  in which these
                    persons (or the Optionee)  control the management of assets,
                    and  any  other  entity  in  which  these  persons  (or  the
                    Optionee)   own  more  than  fifty  percent  of  the  voting
                    interests.



9.       Stock-Based Awards

         A.         Subject to the  provisions  of this Plan,  the  Committee is
                    hereby   authorized   to  make   Stock-   Based   Awards  to
                    Participants.

         B.         Shares underlying Stock-Based Awards shall be issued at such
                    times,  subject to achievement of such  performance or other
                    goals  and  on  such  other  terms  and  conditions  as  the
                    Committee shall deem appropriate.

10.      Satisfaction of Withholding Tax Liabilities

     Each  Optionee or Grantee  must provide the  Corporation  with the means to
satisfy the  Corporation's  Withholding  Tax  Liabilities,  with  respect to any
income  recognized  by the Optionee or Grantee as a result of the exercise of an
Option  or award of a  Stock-Based  Award  (or the  underlying  Shares).  Unless
otherwise  determined  by  the  Committee  and  specifically  set  forth  in the
Optionee's or Grantee's Agreement,  an Option or Grantee may satisfy Withholding
Tax Liabilities by (i) delivering cash to the Corporation, (ii) electing to have
the Corporation  retain Shares otherwise  issuable on the exercise of the Option
or  pursuant  to the award of a  Stock-Based  Award  (other than Shares that are
subject to a substantial  risk of forfeiture),  (iii)  delivering  shares (other
than  Shares  that are  subject  to a  substantial  risk of  forfeiture)  to the
Corporation,  or (iv) electing to satisfy  Withholding Tax Liabilities through a
combination  of clauses (i), (ii) or (iii) of this Article 10.  Satisfaction  of
Withholding  Tax Liabilities  also shall be  accomplished  under such additional




<PAGE>


reasonable  terms and  conditions as the  Committee  deems  appropriate.  Unless
otherwise  determined  by  the  Committee  and  specifically  set  forth  in the
Optionee's  or  Grantee's  Agreement,  in the case of an  Insider  who elects to
satisfy  Withholding  Tax  Liabilities by having the  Corporation  retain Shares
otherwise  issuable on the  exercise  of an Option or pursuant to a  Stock-Based
Award,  the  Insider  shall  have  the  right  to  so  satisfy  Withholding  Tax
Liabilities  through  (a) an  irrevocable  election  made at least six months in
advance of the date on which the Withholding Tax Liabilities  arise,  and (b) if
the  Withholding  Tax  Liabilities  arise  during  the ten  business  day period
beginning  on the  third  business  day  following  the  public  release  of the
Corporation's  quarterly or annual earnings  ("Window  Period"),  an irrevocable
election made during such Window Period.


11.      Capital Adjustments

     The number and class of Shares subject to each outstanding Option or Stock-
Based Award,  the Option Price and the aggregate  number and class of Shares for
which grants or awards thereafter may be made shall be equitably adjusted by the
Committee to reflect such events as stock dividends, stock splits, extraordinary
cash  dividends,   adoption  of  stock  rights  plans,  split-ups,   split-offs,
spin-offs, liquidations,  combinations or exchange of shares, recapitalizations,
mergers, consolidations, reorganizations or any similar transaction of or by the
Corporation.


12.      Termination or Amendment

     The Board shall have the power to terminate the Plan and to amend it in any
respect,  provided that, after the Plan has been approved by the shareholders of
the Company,  the Board may not, without the approval of the shareholders of the
Company if such approval is then required by applicable  law,  amend the Plan so
as to increase materially the number of Shares that may be issued under the Plan
(except as provided in Article 11), to modify  materially the requirements as to
eligibility  for  participation  in the  Plan,  or to  increase  materially  the
benefits accruing to participants under the Plan. No termination or amendment of
the Plan  shall,  without  his or her  consent,  adversely  affect the rights or
obligations of any Optionee or Grantee.


13.      Modification, Extension and Renewal of Options and Bonus Stock

     Subject to the terms and conditions and within the limitations of the Plan,
the Committee may modify,  extend or renew  outstanding  Options,  or accept the
surrender  of  outstanding  Options  (to the extent not  theretofore  exercised)
granted under the Plan or under any other plan of the Corporation,  or a company
or similar entity acquired by the Corporation or a Subsidiary, and authorize the




<PAGE>


granting of new Options (to the extent not theretofore  exercised),  pursuant to
the Plan in  substitution  therefor  and 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
Plan.  Subject to the terms and  conditions  and within the  limitations  of the
Plan, the Committee may modify the terms of any outstanding  Agreement providing
for a Stock-Based Award. Notwithstanding the foregoing, however, no modification
of an Option granted under the Plan, or a Stock-Based Award, shall,  without the
consent of the  Optionee or Grantee,  alter or impair any of the  Optionee's  or
Grantee's right or obligations.


14.      Effectiveness of the Plan

     The Plan and any  amendments  requiring  shareholder  approval  pursuant to
Article  12  are  subject  to  approval  by  vote  of  the  shareholders  of the
Corporation within 12 months after their adoption by the Board.  Subject to that
approval,  the Plan and any  amendments  are effective on the date on which they
are  adopted by the Board.  Options  and Stock-  Based  Awards may be granted or
awarded  prior  to  shareholder  approval  of the Plan or  amendments  requiring
shareholder  approval,  but each such Option grant or Stock-Based Award shall be
subject to the approval of the Plan or amendments by the shareholders. Except to
the extent required to satisfy the requirements of Rule 16b-3 under the Exchange
Act, the date on which any Option granted or Stock-Based  Award awarded prior to
shareholder  approval of the Plan or amendment  requiring  shareholder  approval
shall be the Date of Grant for all  purposes  as if the  Option  or  Stock-Based
Award had not been subject to shareholder  approval.  No Option may be exercised
prior to such shareholder  approval,  and any Stock-Based Award awarded shall be
forfeited if such shareholder approval is not obtained.


15.      Term of the Plan

     Unless  sooner  terminated  by the Board  pursuant  to Article 12, the Plan
shall  terminate on May 22, 2010,  and no Options or  Stock-Based  Awards may be
granted after termination.  The termination shall not affect the validity of any
Options or Stock-Based Awards outstanding on the date of termination.





<PAGE>



16.      Indemnification of Committee

     In addition  to such other  rights of  indemnification  as they may have as
Directors or as members of the Committee,  the members of the Committee shall be
indemnified  by the  Corporation  against  the  reasonable  expenses,  including
attorneys' fees, actually and reasonably incurred in connection with the defense
of any action, suit or proceeding,  or in connection with any appeal therein, to
which  they or any of them  may be a party  by  reason  of any  action  taken or
failure to act under or in connection with the Plan or any Option or Stock-Based
Award granted or awarded  hereunder,  and against all amounts reasonably paid by
them in settlement  thereof or paid by them in  satisfaction  or judgment in any
such action,  suit or  proceeding,  if such members acted in good faith and in a
manner which they  believed to be in, and not opposed to, the best  interests of
the Corporation.


17.      General Provisions

         A.         The  establishment  of the Plan  shall not  confer  upon any
                    Employee or Consultant any legal or equitable  right against
                    the Corporation,  any Subsidiary or the Committee, except as
                    expressly provided in the Plan.

         B.         The Plan does not constitute inducement or consideration for
                    the  employment  of any  Employee  or the  retention  of any
                    Consultant,  nor is it a contract between the Corporation or
                    a Subsidiary and any Employee or  Consultant.  Participation
                    in the Plan shall not give an  Employee  or  Consultant  any
                    right to be retained in the  service of the  Corporation  or
                    Subsidiary.

         C.         The  Corporation  and its  Subsidiaries  may assume options,
                    warrants,  or rights to purchase  stock issued or granted by
                    other  corporations  whose stock or assets shall be acquired
                    by the Corporation or a Subsidiary, or which shall be merged
                    into or  consolidated  with the Corporation or a Subsidiary.
                    Neither the adoption of this Plan, nor its submission to the
                    shareholders,  shall be taken to impose any  limitations  on
                    the powers of the  Corporation  or its  affiliates to issue,
                    grant, or assume options,  warrants, rights, or bonus stock,
                    otherwise  than  under this Plan,  or to adopt  other  stock
                    option  or   stock-based   award  plans  or  to  impose  any
                    requirement of shareholder approval upon the same.

         D.         The  interests  of any  Participant  under  the Plan are not
                    subject to the claims of creditors  and may not, in any way,
                    be assigned,  alienated or encumbered  except as provided in
                    Article 8.

         E.         The Plan and each Agreement shall be governed, construed and
                    administered  in  accordance  with the laws of the  State of
                    Delaware.




<PAGE>


         F.         The adoption of the Plan,  the grant and exercise of Options
                    and the award of  Stock-Based  Awards  shall be  subject  to
                    receipt  of all  required  regulatory  approvals,  including
                    without  limitation  any  required  approvals of the Federal
                    Communications Commission.

         G.         Should any  provision of the Plan that is intended to comply
                    with the  provisions of Rule 16b-3 under the Exchange Act at
                    the date of the  adoption  of the Plan by the  Board  not be
                    necessary for such compliance, or become no longer necessary
                    for such  compliance,  such provision of the Plan shall have
                    no force or  effect  under the Plan as of the date that such
                    provision  is not  required  for purpose of  satisfying  the
                    provisions of Rule 16b-3 under the Exchange Act.




<PAGE>
        This Proxy is Solicited By The Board of Directors of the Company


                      AMERICAN MOBILE SATELLITE CORPORATION


                    PROXY FOR ANNUAL MEETING OF STOCKHOLDERS

                                  May 23,2000


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 Tuesday, May 23, 2000  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 six 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
through 6 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, Billy J. Parrott, Gary M. Parsons, Walter V. Purnell, Jr.,
Andrew A. Quartner, and Jack A. Shaw

(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.  Amend Company's Restated Certificate of Incorporation to remove
    requirement of a minimum Board size:

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


3.  Amend Company's Restated Certificate of Incorporation to change
    requirement for amending Certificate of Incorporation from two-thirds
    of the outstanding common stock to a majority of the outstanding
    common stock:

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


4.  Amend  and  Restate  Company's  1989   Employee  Stock  Option  Plan  as the
    "American  Mobile  Satellite  Corporation   Stock  Award  Plan" to  increase
    authorized shares available to 7,300,000:

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


5.  Amend Company's Employee Stock Purchase Plan to increase the number of
    authorized shares available to 600,000:

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


6.  Ratify  the  appointment  of  Arthur Andersen LLP as independent accountants
    for American Mobile for the year 2000:

    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



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