AMERICAN MOBILE SATELLITE CORP
S-8, 1999-10-12
COMMUNICATIONS SERVICES, NEC
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                                                      Registration No. 333-_____


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                            ------------------------

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------

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

                                    Delaware
                         (State or other jurisdiction of
                         incorporation or organization)

                                   93-0976127
                      (IRS employer identification number)

                            10802 Parkridge Boulevard
                           Reston, Virginia 20191-5416
                                 (703) 758-6000
               (Address, including zip code, and telephone number,
                 including area code, of registrant's principal
                               executive offices)
                            ------------------------
                      American Mobile Satellite Corporation
               1999 Stock Option Plan for Non-employee Directors
                            (Full title of the Plan)
                            ------------------------

                                 Randy S. Segal
              Senior Vice President, General Counsel and Secretary
                      American Mobile Satellite Corporation
                            10802 Parkridge Boulevard
                           Reston, Virginia 20191-5416
                                 (703) 758-6000
            (Name, address and telephone number of Agent for Service)
                            ------------------------

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
                                                 Amount           Proposed Maximum       Proposed Maximum       Amount of
           Title of securities                    to be            Offering Price       Aggregate Offering     Registration
             to be registered                Registered (1)        per Share (2)            Price (2)              Fee

<S>                                              <C>                  <C>                    <C>                  <C>
              Common Stock                       50,000               $13.3125               $665,625             $185.04

==========================================  =================  ====================== ======================  ==============
</TABLE>

(1)  With respect to the Plan, an additional  50,000 shares of the  registrant's
     common stock were registered on the registrant's  registration statement on
     Form  S-8  (File  No.  33-91714).

(2)  Estimated  solely  for the  purpose of  calculating  the  registration  fee
     pursuant to Rule 457(h) of the Securities Act of 1933, as amended.





<PAGE>



                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

         The documents containing the information  specified in Part I have been
and/or will be sent or given to  participants  as specified by Rule 428(b)(1) of
the Securities  Act of 1933, as amended (the  "Securities  Act").  In accordance
with the  instructions  to Part I of Form S-8, such  documents will not be filed
with the Securities and Exchange Commission (the "Commission") either as part of
this  Registration  Statement  or  as  prospectuses  or  prospectus  supplements
pursuant to Rule 424 of the Securities  Act.  These  documents and the documents
incorporated  by  reference  pursuant to Item 3 of Part II of this  registration
statement,  taken  together,  constitute  the  prospectus as required by Section
10(a) of the Securities Act.


                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

         This registration statement registers additional shares of Common Stock
of  American  Mobile   Satellite   Corporation   (the  "Company")  for  which  a
registration  statement on Form S-8 relating to the Company's  Stock Option Plan
for  Non-employee  Directors is effective.  This  registration  statement hereby
incorporates by reference the contents of such earlier registration statement on
Form S-8 (File No.
33-91714).

Item 3.           Incorporation of Documents by Reference.

         The Company hereby  incorporates  by reference  into this  registration
statement the following documents filed by it with the Commission:

         (a)  The  Company's  Registration  Statement  on  Form  S-8  (File  No.
              33-91714);

         (b)  The  Company's  annual report  on Form  10-K  for the  year  ended
              December 31, 1998;

         (c)  The Company's quarterly  report on Form 10-Q for the quarter ended
              March 31, 1999;

         (d)  The Company's quarterly  report on Form 10-Q for the quarter ended
              June 30, 1999;

         (e)  The  Company's  current  report on Form 8-K dated June 7, 1999 and
              filed with the Commission on June 9, 1999;

         (f)  The  Company's  current  report on Form 8-K dated July 9, 199  and
              filed with the Commission on July 9, 1999;

         (g)  The  Company's  current  report on  Form  8-K  dated July 23, 1999
              and filed with the Commission on July 26, 1999;

         (h)  The Company's current report on Form 8-K dated October 5, 1999 and
              filed with the Commission on October 6, 1999; and

         (i)  The description of the Company's  common stock, par value $.01 per
              share ("Common  Stock"), contained  in  the Company's registration
              statement  on  Form 8-A, dated December 9, 1993 and on Form 8-A/A,
              dated December 13, 1993.





<PAGE>



         In addition,  all documents and reports filed by the Company subsequent
to the date  hereof  pursuant  to Sections  13(a),  13(c),  14, and 15(d) of the
Securities  Exchange Act of 1934, as amended (the "Exchange Act"),  prior to the
filing of a post-effective amendment which indicates that all securities offered
have been sold or which deregisters all securities  remaining  unsold,  shall be
deemed to be incorporated by reference in this registration  statement and to be
part hereof from the date of filing of such documents or reports.  Any statement
contained in a document  incorporated  or deemed to be incorporated by reference
herein  shall be  deemed to be  modified  or  superseded  for  purposes  of this
registration statement to the extent that a statement contained herein or in any
other  subsequently filed document which also is or is deemed to be incorporated
by reference herein modifies or supersedes such statement. Any such statement so
modified or superseded shall not be deemed, except as so modified or superseded,
to constitute a part of this registration statement.

Item 4.           Description of Securities.

         A  description  of  the  Company's  Common  Stock  is  incorporated  by
reference under Item 3.

Item 5.           Interests of Named Experts and Counsel.

         The legal  opinion with respect to the legality of the shares of Common
Stock being registered hereby, which opinion is being filed as Exhibit 5 to this
registration  statement,  is  being  provided  by Randy S.  Segal,  Senior  Vice
President,  General Counsel and Secretary of the Company. Ms. Segal owns 163,032
shares of common stock.  Her ownership  also includes  shares  issuable upon the
exercise of options  granted under the Company's Stock Option Plan which options
are vested and exercisable,  or which may be vested and exercisable within sixty
(60) days of the date of this registration statement.


Item 6.           Indemnification of Directors and Officers.

         The  Company's  Bylaws  provide  that the Company  will  indemnify  its
directors  and officers to the fullest  extent  permitted  by Delaware  law. The
Company  may  be  required  to  advance  litigation  expenses  in  the  case  of
stockholder  derivative actions or other actions,  against an undertaking by the
indemnified party to repay such advances if it is ultimately determined that the
indemnified party is not entitled to indemnification.

         In addition,  the Company's Certificate of Incorporation provides that,
pursuant to Delaware law, its directors shall not be liable for monetary damages
for breach of the directors'  fiduciary duty of care to the  corporation and its
stockholders.  This  provision  in the  Certificate  of  Incorporation  does not
eliminate the duty of care, and in appropriate  circumstances equitable remedies
such as injunctive or other forms of  nonmonetary  relief will remain  available
under  Delaware  law. In addition,  each director will continue to be subject to
liability for breach of the  director's  duty of loyalty to the Company for acts
or omissions not in good faith or involving intentional misconduct,  for knowing
violations  of law,  for  actions  leading to improper  personal  benefit to the
director,  and for payment of  dividends  or approval  of stock  repurchases  or
redemptions  that are unlawful  under  Delaware law. The provision also does not
affect a director's  responsibilities  under any other law,  such as the federal
securities laws.

         At present,  there is no pending litigation or proceeding  involving an
officer or director of the Company as to which  indemnification is being sought,
nor is the Company aware of any threatened  litigation that may result in claims
for indemnification by any officer or director.




<PAGE>





Item 7.           Exemption from Registration Claimed.

         Not applicable.

Item 8.                    Exhibits.

Exhibit Number                      Description

4.1                 Restated  Certificate  of  Incorporation  of the Company (as
                    restated effective September 7, 1999) (filed herewith).

4.2                 Amended and  Restated  Bylaws of the Company (as amended and
                    restated effective September 23, 1999) (filed herewith).

4.3                 Specimen  of  Common  Stock   Certificate   of  the  Company
                    (incorporated  by  reference  to  Exhibit  No.  4.1  to  the
                    Company's  Registration  Statement  on Form  S-1  (File  No.
                    33-70468)).

4.4                 American Mobile Satellite Corporation 1999 Stock Option Plan
                    for Non- Employee Directors (filed herewith).

4.5                 Form of Non-employee  Director Stock Option Agreement (filed
                    herewith).

5                   Opinion of Randy S. Segal,  Senior Vice  President,  General
                    Counsel  and  Secretary,   regarding  the  legality  of  the
                    securities being registered.

23.1                Consent of Randy S. Segal (included in Exhibit 5).

23.2                Consent  of  Arthur   Andersen   LLP,   independent   public
                    accountants.

23.3                Consent   of  KPMG   LLP,   independent   certified   public
                    accountants.

24                  Powers of Attorney (included on the signature pages hereof).



Item 9.                    Undertakings.

         The undersigned Registrant hereby undertakes:

                         (1) To file, during any period in which offers or sales
                  are   being  made,   a   post-effective   amendment   to  this
                  registration statement:

                               (i)  To  include  any   prospectus  required   by
                  Section 10(a)(3) of the Securities Act;

                               (ii) To reflect in  the  prospectus  any facts or
                  events arising after the  effective date  of the  registration
                  statement   (or  the   most  recent  post-effective  amendment
                  thereof)  which, individually or  in the aggregate,  represent
                  a  fundamental  change  in the  information  set  forth in the
                  registration statement;



<PAGE>




                                (iii)  To include any material information  with
                  respect to the plan of distribution  not previously  disclosed
                  in the  registration  statement or any material change to such
                  information in the registration statement.

                           provided,  however,  that  paragraphs  (a)(1)(i)  and
                  (a)(1)(ii)  do not apply if the  registration  statement is on
                  Form  S-3,  or Form  S-8 or  Form  F-3,  and  the  information
                  required to be included in a post-effective amendment by those
                  paragraphs  is  contained  in periodic  reports  filed with or
                  furnished  to the  Commission  by the  Registrant  pursuant to
                  Section  13 or  Section  15(d)  of the  Exchange  Act that are
                  incorporated by reference in the registration statement.

                           (2)  That,  for  the  purpose  of   determining   any
                  liability under the Securities  Act, each such  post-effective
                  amendment shall be deemed to be a new  registration  statement
                  relating to the securities  offered therein,  and the offering
                  of such  securities  at that  time  shall be  deemed to be the
                  initial bona fide offering thereof.

                           (3)  To  remove  from  registration  by  means  of  a
                  post-effective   amendment   any  of  the   securities   being
                  registered  which  remain  unsold  at the  termination  of the
                  offering.

     The  undersigned   Registrant  hereby  undertakes  that,  for  purposes  of
determining  any  liability  under  the  Securities  Act,  each  filing  of  the
Registrant's  annual  report  pursuant to Section  13(a) or Section 15(d) of the
Exchange Act (and, where  applicable,  each filing of an employee benefit plan's
annual  report   pursuant  to  Section  15(d)  of  the  Exchange  Act)  that  is
incorporated by reference in the Registration  Statement shall be deemed to be a
new registration  statement relating to the securities offered therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

     Insofar as  indemnification  for liability arising under the Securities Act
may  be  permitted  to  directors,  officers  and  controlling  persons  of  the
Registrant pursuant to the foregoing  provisions,  or otherwise,  the Registrant
has been advised that in the opinion of the Commission such  indemnification  is
against  public  policy as expressed in the  Securities  Act and is,  therefore,
unenforceable.  In the  event  that a claim  for  indemnification  against  such
liabilities  (other than the payment by the  Registrant or expenses  incurred or
paid by a director,  officer or controlling  person in successful defense of any
action  ,  suit  or  proceeding)  is  asserted  by  such  director,  officer  or
controlling  person in connection  with the  securities  being  registered,  the
Registrant  will,  unless in the  opinion  of its  counsel  the  matter has been
settled by controlling precedent,  submit to a court of appropriate jurisdiction
the question of whether such  indemnification  by it is against public policy as
expressed in the Securities  Act and will be governed by the final  adjudication
of such issue.





<PAGE>



                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the undersigned
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the County of Fairfax,  Commonwealth  of Virginia,  on   October
12, 1999.

                                     AMERICAN MOBILE
                                     SATELLITE CORPORATION



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


                                POWER OF ATTORNEY

Know all men by these  presents,  that each individual  whose signature  appears
below  constitutes  and appoints  Gary M. Parsons,  Walter V. Purnell,  Jr., and
Randy S.  Segal,  and each of them,  his true and  lawful  attorney-in-fact  and
agent, with power of substitution and  resubstitution,  for him and in his name,
place and stead,  in any and all  capacities,  to sign a registration  statement
(the  "Registration  Statement")  relating to a registration of shares of common
stock on Form S-8 and to sign any and all amendments  (including  post-effective
amendments)  to the  Registration  Statement,  and to file  the  same,  with all
exhibits and other  documents in connection  therewith,  with the Securities and
Exchange Commission,  granting unto said  attorneys-in-fact and agents, and each
of them, full power and authority to do and perform each and every act and thing
requisite and  necessary to be done in and about the  premises,  as fully to all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming all that said  attorneys-in-fact and agents, or any of them, or their
or his substitutes or substitute,  may lawfully do or cause to be done by virtue
hereof.


         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Registration  Statement  has been signed below by the  following  persons in the
capacities and on the dates indicated:


Signature                       Title                              Date


/s/Walter V. Purnell, Jr.       President and                October 12, 1999
- -------------------------
Walter V. Purnell, Jr.          Chief Executive Officer


/s/W. Bartlett Snell            Senior Vice President and    October 12, 1999
- --------------------
W. Bartlett Snell               Chief Financial Officer
                                (principal financial and
                                accounting officer)





<PAGE>





/s/Gary M. Parsons              Chairman of the              October 12, 1999
- ------------------
Gary M. Parsons                 Board of Directors


/s/Douglas I. Brandon           Director                     October 12, 1999
- ---------------------
Douglas I. Brandon


/s/Billy J. Parrott             Director                     October 12, 1999
- -------------------
Billy J. Parrott

/s/Andrew A. Quartner           Director                     October 12, 1999
- ---------------------
Andrew A. Quartner

/s/Jack A. Shaw                 Director                     October 12, 1999
- ---------------
Jack A. Shaw











                                   Exhibit 4.1

                                    RESTATED
                          CERTIFICATE OF INCORPORATION
                                       OF
                      AMERICAN MOBILE SATELLITE CORPORATION


     American Mobile Satellite Corporation, a corporation organized and existing
under and by virtue of the Delaware General Corporation Law (the "Corporation"),
hereby certifies as follows:

     1. The name of the Corporation is American Mobile Satellite Corporation; it
was  originally   incorporated   under  the  name  "American   Mobile  Satellite
Consortium,  Inc.," and its original  Certificate of Incorporation  was filed on
May 3, 1988;

     2. This Restated Certificate of Incorporation, the entirety of which is set
forth  below,  has been duly  adopted  in  accordance  with  Section  245 of the
Delaware  General  Corporation  Law, only restates and  integrates  and does not
further amend the provisions of the  Corporation's  certificate of incorporation
as heretofore amended or supplemented, and there is no discrepancy between those
provisions and the provisions of this Restated Certificate of Incorporation.

     FIRST:   The  name  of  the  Corporation  is  American   Mobile   Satellite
Corporation.

     SECOND:  The address of the  registered  office of the  Corporation  in the
State of Delaware is Corporation  Trust Center,  1209 Orange Street, in the City
of Wilmington,  County of New Castle,  and the name of its  registered  agent at
that address is The Corporation Trust Company.

     THIRD:  The  purpose of the  Corporation  is to engage in any lawful act or
activity for which  corporations may be organized under the General  Corporation
Law of the State of Delaware,  including  specifically  to act as the registered
agent of its wholly owned subsidiaries.

     FOURTH:

     A. Authorized  Capital Stock.  The total number of shares of all classes of
stock which the  Corporation  shall be  authorized to issue shall be one hundred
fifty  million two hundred  thousand  (150,200,000)  shares.  One hundred  fifty
million  (150,000,000)  of said shares shall be of a par value of $.01 per share
and shall be designated  common stock ("Common  Stock") and two hundred thousand
(200,000)  of said shares shall be of a par value of $.01 per share and shall be
designated Series Preferred Stock.

     B. Series  Preferred  Stock.  The Series Preferred Stock may be issued from
time to time by the board of directors as herein provided in one or more series.
The designations,  relative rights,  preferences and limitations with respect to
the Series  Preferred  Stock,  and with  respect  to the  shares of each  series
thereof,  may, to the extent  permitted by law, be similar to or may differ from
those of any other series.  The board of directors of the  Corporation is hereby
expressly granted authority, subject to the provision of this Article FOURTH, to
issue from time to time Series Preferred Stock in one or more series, and to fix
from time to time before issuance thereof,  by filing of a certificate  pursuant
to the General Corporation Law of the State of Delaware, the number of shares in
each such series, and all designations, relative rights (including the right, to
the extent  permitted by law, to convert into shares of any class or into shares
of any series of any class),  preferences  and limitations of the shares in each
such series,  including,  but without  limiting the generality of the foregoing,
the following:

     1. The number of shares to constitute  such series (which number may at any
time, or from time to time, be increased or decreased by the board of directors,
notwithstanding that shares of the series may be outstanding at the time of such
increase  or  decrease,  unless  the board of  directors  shall  have  otherwise
provided in creating such series) and the distinctive designation thereof;


<PAGE>


     2. The dividend rate on the shares of such series, whether or not dividends
on the shares of such series shall be cumulative and the date or dates,  if any,
from which dividends thereon shall be cumulative;

     3.  Whether or not the shares of such series shall be  redeemable,  and, if
redeemable,  the date or dates upon or after which they shall be redeemable  and
the amount or amounts per share  payable  thereon in the case of the  redemption
thereof,  which  amount may vary at different  redemption  dates or otherwise as
permitted by law;

     4. The right,  if any,  of holders of shares of such  series to convert the
same into, or exchange the same for, shares of Common Stock or other  securities
as  permitted  by law,  and the  terms  and  conditions  of such  conversion  or
exchange,  as well as provisions for  adjustment of the conversion  rate in such
events as the board of directors shall determine;

     5. The amount  per share  payable  on the  shares of such  series  upon the
voluntary  and  involuntary  liquidation,  dissolution  or  winding  up  of  the
Corporation;

     6.  Whether the holders of shares of such series  shall have voting  power,
full or limited,  in addition to the voting powers provided by law, and, in case
additional voting powers are accorded, to fix the extent thereof; and

     7. Generally to fix the other rights and privileges and any qualifications,
limitations  or  restrictions  on such  rights and  privileges  of such  series,
provided, however, that no such rights, privileges, qualifications,  limitations
or restrictions  shall be in conflict with the Certificate of  Incorporation  of
the  Corporation or with the  resolution or resolutions  adopted by the board of
directors  providing  for the issue of any series of which there are shares then
outstanding.

     C. Voting.

     1. On all  matters  upon which  holders  of Common  Stock are  entitled  or
permitted  to vote,  every  holder of Common  Stock shall be entitled to one (1)
vote in person  or by proxy for each  share of  Common  Stock  standing  in such
holder's name on the transfer books of the Corporation.

     2.  Except as  otherwise  specifically  provided in the  certificate  filed
pursuant  to law with  respect  to any  series of Series  Preferred  Stock or as
otherwise  provided by law, the Series  Preferred Stock shall not have any right
to  vote  on any  matters  submitted  to the  stockholders  of the  Corporation,
including,  without limitation,  the election of directors.  In all instances in
which voting rights are granted to Series Preferred Stock or any series thereof,
such Series  Preferred Stock or series shall vote as provided in the certificate
filed pursuant to law with respect to any series of Series Preferred Stock or as
otherwise provided by law.

     D.  Dividends.  The  holders of Common  Stock  shall be entitled to receive
dividends and distributions of the Corporation when and as declared by the board
of  directors  out  of  funds  legally  available  therefor.  Dividends  on  the
outstanding  Series Preferred Stock of each series shall be declared and paid or
set apart for payment  before any  dividends  shall be declared  and paid or set
apart for payment on the Common Stock with respect to the same dividend  period.
Dividends on any shares of Serie Preferred Stock shall be cumulative only if and
to the extent set forth in a certificate  filed pursuant to law. After dividends
on all shares of Series Preferred Stock (including  cumulative  dividends if and
to the  extent  any such  shares  shall be  entitled  thereto)  shall  have been
declared and paid or set apart for payment with respect to any dividend  period,
then and not  otherwise  as long as any shares of Series  Preferred  Stock shall
remain outstanding,  dividends may be declared and paid or set apart for payment
with respect to the same  dividend  period on the Common Stock out of the assets
or funds of the Corporation legally available therefor.

     E. Liquidation, Dissolution or Winding Up. In the event of any liquidation,
dissolution or winding up of the Corporation,  whether voluntary or involuntary,
each series of Series  Preferred  Stock shall have  preference and priority over
the Common Stock for payment of the amount to which each  outstanding  series of
Series  Preferred  Stock  shall be entitled in  accordance  with the  provisions
thereof and each holder of Series  Preferred  Stock shall be entitled to be paid
in full such amount,  or hav a sum sufficient for the payment in full set aside,
before any payments  shall be made to the holders of the Common  Stock.  If upon
liquidation,  dissolution  or winding up of the  Corporation,  the assets of the
Corporation  or the  proceeds  thereof,  distributable  among the holders of the
shares of all series of Series  Preferred  Stock shall be insufficient to pay in
full the  preferential  amount  aforesaid,  then such  assets,  or the  proceeds
thereof,  shall be distributed among such holders ratably in accordance with the
respective  amounts which would be payable if all amounts  payable  thereof were
paid in full.  After the  holders of the Series  Preferred  Stock of each series
shall have been paid in full the  amounts to which  they  respectively  shall be
entitled,  or a sum sufficient for the payment in full set aside,  the remaining
net assets of the  Corporation,  after  payment or provision  for payment of the
debts of the  Corporation,  shall be distributed  pro rata to the holders of the
Common  Stock,   to  the  exclusion  of  the  holders  of  Preferred   Stock.  A
consolidation or merger of the Corporation  with or into another  corporation or
corporations,  or a sale,  whether  for cash,  shares of  stock,  securities  or
properties, of all or substantially all of the assets of the Corporation,  shall
not be deemed or construed to be a liquidation, dissolution or winding up of the
Corporation within the meaning of this Article FOURTH.

     F. Redemption of Series Preferred Stock. In the event that Series Preferred
Stock of any series shall be made  redeemable as provided in  subsection  B.3 of
this Article FOURTH,  the Corporation,  at the option of the board of directors,
may redeem at any time or times,  and from time to time,  all or any part of any
one or more  series of Series  Preferred  Stock  outstanding  by paying for each
share the then  applicable  redemption  price fixed by the board of directors as
provided  herein,  plus an amount  equal to accrued and unpaid  dividends to the
date  fixed for  redemption,  upon such  notice  and  terms as  provided  in the
certificates  filed  pursuant  to law with  respect  to such  series  of  Series
Preferred Stock.

     FIFTH:  At all  elections of directors of the  Corporation,  each holder of
Common  Stock  shall be  entitled to any many votes as shall equal the number of
votes which  (except for such  provision  as to  cumulative  voting) such holder
would be entitled to cast for the election of directors multiplied by the number
of  directors  to be  elected,  and such holder may cast all of such votes for a
single director or may distribute such votes among the number of directors to be
voted for, or for any two or more o them as such holder may see fit.

         The number of  directors  shall not be less than seven.  All  directors
         shall be elected at each election of directors by the holders of Common
         Stock. Elections of directors need not be by written ballot.

     SIXTH:  For the  management  of the  business  and for the  conduct  of the
affairs of the Corporation, and in further definition, limitation and regulation
of the powers of the Corporation and of its directors and of its stockholders or
any class thereof,  as the case may be, it is further provided as follows:

          1.  Except as  otherwise  expressly  provided in this  Certificate  of
     Incorporation or the bylaws, all actions of the board of directors shall be
     taken  upon  or  pursuant  to the  affirmative  vote of a  majority  of the
     directors present at a meeting at which a quorum is present.

          2. The affirmative vote of the holders of two-thirds of the issued and
     outstanding  shares of Common Stock shall be required to approve any of the
     following  actions:  a. the merger or consolidation of the Corporation with
     or  into  any  other  entity;   the   dissolution  or  liquidation  of  the
     Corporation; or the sale, exchange, or lease of all or substantially all of
     the Corporation's property and assets.

     SEVENTH:  No  fractional  shares  of  Common  Stock  shall be issued by the
Corporation.  In lieu of any fractional shares to which a holder would otherwise
be entitled, the Corporation shall pay cash equal to such fraction multiplied by
the fair market value per share of such Common Stock.

     EIGHTH:  If  and to  the  extent  permitted  by  the  provisions  governing
amendment of the bylaws contained therein,  the board of directors is authorized
to make, repeal, alter, amend and rescind the bylaws of the Corporation.

     NINTH:  To the fullest extent  permitted by the General  Corporation Law of
Delaware or any other  applicable  laws  presently  or  hereafter  in effect,  a
director of the Corporation shall not be personally liable to the Corporation or
its  stockholders  for  monetary  damages  for  breach  of  fiduciary  duty as a
director.  Any repeal or  modification of this Article NINTH shall not adversely
affect  any  right or  protection  of a  director  of the  Corporation  existing
immediately prior to such repeal or modification.

     TENTH:  Each person who is or was a director or officer of the  Corporation
shall be indemnified by the  Corporation to the fullest extent  permitted by the
General Corporation Law of the State of Delaware or any other applicable laws as
presently or hereafter in effect.  Without limiting the generality or the effect
of the foregoing, the Corporation may enter into one or more agreements with any
person which provide for indemnification greater or different than that provided
in this Article TENTH.  Any repeal or  modification  of this Article TENTH shall
not adversely  affect any right or  protection  existing  hereunder  immediately
prior to such repeal or modification.

     ELEVENTH:  The Corporation  reserves the right to amend,  alter,  change or
repeal  any  provision  contained  in this  Certificate,  in the  manner  now or
hereafter  prescribed by statute and this Certificate,  and all rights conferred
on stockholders herein are granted subject to this reservation. This Certificate
may not be amended,  modified,  rendered  ineffective or repealed  except by the
vote of the holders of two thirds of the issued and outstanding shares of Common
Stock.  Other  classes or series of stock  shall not be  entitled to vote on any
such amendment,  modification or other change, unless and to the extent required
by applicable law.

     TWELFTH: The Corporation expressly elects not to be governed by Section 203
of the General Corporation Law of the State of Delaware.

     IN WITNESS WHEREOF, I, the undersigned,  being duly  elected/appointed Vice
President of the Corporation, do on behalf of the Corporation make this Restated
Certificate of Incorporation of the  Corporation,  effective  September 7, 1999,
hereby  declaring and certifying under penalties of perjury that this is the act
and  deed  of the  Corporation  and  the  facts  herein  stated  are  true,  and
accordingly have hereunto set my hand this 15th day of September, 1999.

                                        AMERICAN MOBILE SATELLITE CORPORATION


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


Attested to:


/s/David H. Engvall
- -------------------
Name:    David H. Engvall
Title:   Executive Counsel and
         Assistant Secretary


<PAGE>





Commonwealth of Virginia
County of Fairfax, ss:

         I, Suzanne H. Podhorecki,  a Notary Public,  hereby certify that on the
15th  day  of  September,   1999,  David  H.  Engvall  appeared  before  me  and
acknowledged  that he is the duly authorized and elected  Executive  Counsel and
Assistant Secretary of American Mobile Satellite Corporation, that his signature
was his own act and  deed  and the  foregoing  instrument,  the act and  deed of
American Mobile Satellite Corporation and the facts stated therein are true.



                                               Notary Public

                                               /s/Suzanne H. Podhorecki
                                               ------------------------

                                               My Commission Expires:

                                               October 31, 2001


<PAGE>




Commonwealth of Virginia
County of Fairfax, ss:

         I, Suzanne H. Podhorecki,  a Notary Public,  hereby certify that on the
15th day of September,  1999, Randy S. Segal appeared before me and acknowledged
that she is the duly  authorized  and  elected  Senior Vice  President,  General
Counsel  and  Secretary  of  American  Mobile  Satellite  Corporation,  that her
signature  was her own act and deed and the  foregoing  instrument,  the act and
deed of American Mobile  Satellite  Corporation and the facts stated therein are
true.




                                                       Notary Public

                                                       /s/Suzanne H. Podhorecki
                                                       ------------------------

                                                       My Commission Expires:

                                                       October 31, 2001






                                   Exhibit 4.2

                           AMENDED AND RESTATED BYLAWS
                                       OF
                      AMERICAN MOBILE SATELLITE CORPORATION
                           (As of September 23, 1999)



<PAGE>






                                TABLE OF CONTENTS
                                                                            Page

ARTICLE I.                 OFFICES.......................................      1

ARTICLE II.                MEETINGS OF STOCKHOLDERS......................      2

ARTICLE III.               DIRECTORS.....................................      5

ARTICLE IV.                NOTICES.......................................      9

ARTICLE V.                 OFFICERS......................................      9

ARTICLE VI.                CERTIFICATES OF STOCK.........................     12

ARTICLE VII.               PROCUREMENT...................................     14

ARTICLE VIII.              INDEMNIFICATION OF DIRECTORS
                           AND OFFICERS..................................     14

ARTICLE IX.                GENERAL PROVISIONS............................     15

ARTICLE X.                 AMENDMENTS....................................     15




<PAGE>






                                   ARTICLE I.
                                     OFFICES

     SECTION 1. The registered  office of American Mobile Satellite  Corporation
(the  "Corporation")  shall be in the City of Wilmington,  County of New Castle,
State of Delaware, or such other place within the State of Delaware as the board
of directors may from time to time determine.

     SECTION 2. The  Corporation may also have offices at such other places both
within and without the State of Delaware as the board of directors may from time
to time determine or the business of the Corporation may require.



                                   ARTICLE II.
                            MEETINGS OF STOCKHOLDERS

     SECTION 1. All meetings of the  stockholders  for the election of directors
or for any other purpose shall be held at such time and place, within or without
the State of  Delaware,  but within the United  States of  America,  as shall be
stated  in the  notice of the  meeting  or in a duly  executed  waiver of notice
thereof.

     SECTION 2. Annual  meetings of the  stockholders of the Corporation for the
purpose of electing  directors and for the transaction of such other business as
may be properly brought before such meetings shall be held on the third Thursday
of April in each  year,  or at such other  time,  date and place as the board of
directors shall determine by resolution.

     SECTION 3. Written notice of the annual meeting of stockholders stating the
place, date and hour of the meeting shall be given to each stockholder  entitled
to vote at such  meeting  not less than ten nor more than sixty days  before the
date of the meeting.

     SECTION  4.  The  officer  who  has  charge  of  the  stock  ledger  of the
Corporation  shall  prepare and make,  at least ten days before every meeting of
stockholders,  a  complete  list  of the  stockholders  entitled  to vote at the
meeting,  arranged  in  alphabetical  order,  and  showing  the  address of each
stockholder  and the number and class of shares  registered  in the name of each
stockholder. Such list shall be open for examination by any stockholder, for any
purpose germane to the meeting,  during ordinary business hours, for a period of
at least ten days prior to the meeting,  either at a place within the city where
the meeting is to be held,  which place shall be  specified in the notice of the
meeting, or, if not so specified,  at the place where the meeting is to be held.
The list shall also be  produced  and kept at the time and place of the  meeting
during the whole time thereof,  and may be inspected by any  stockholder  who is
present.



<PAGE>


                                      - 2 -



     SECTION  5.  Special  meetings  of the  stockholders,  for any  purpose  or
purposes,  unless  otherwise  prescribed  by  statute or by the  Certificate  of
Incorporation,  may be  called  by the  president  and  shall be  called  by the
president  or  secretary at the request in writing of a majority of the board of
directors, or at the request in writing of the holder or holders of Common Stock
representing  at  least  33-1/3%  of the  shares  of  Common  Stock  issued  and
outstanding and entitled to vote. A special meeting of the holders of the Common
Stock for the sole purpose of electing all of the  directors of the  Corporation
shall be called by the  president or secretary  promptly upon the receipt by the
secretary  of a written  request  from the  holder or  holders  of Common  Stock
representing  that  percentage  of the shares of Common  Stock  then  issued and
outstanding  that would be  sufficient  to elect at least one  director  if such
shares of Common Stock were then cumulatively voted in an election of the entire
board of directors.

     SECTION 6. Written notice of a special meeting of stockholders  stating the
place,  date and hour of the meeting  and the purpose or purposes  for which the
meeting  is  called,  shall be given not less than ten nor more than  sixty days
before the date of the  meeting  to each  stockholder  entitled  to vote at such
meeting.  Business  transacted at any special meeting of  stockholders  shall be
limited to the purposes stated in the notice.

     SECTION  7. The  holders  of a  majority  of the  Common  Stock  issued and
outstanding  and entitled to vote thereat,  present in person or  represented by
proxy,  shall constitute a quorum at all meetings of the holders of Common Stock
for the  transaction of business  except as otherwise  provided by statute or by
the Certificate of Incorporation.  If, however, such quorum shall not be present
or  represented  at any meeting of the holders of Common  Stock,  the holders of
Common  Stock  entitled to vote  thereat,  present in person or  represented  by
proxy, shall have power to adjourn the meeting from time to time, without notice
other  than  announcement  at the  meeting,  until a quorum  shall be present or
represented.  At such  adjourned  meeting at which a quorum  shall be present or
represented,  any business may be transacted which might have been transacted at
the meeting as originally  notified.  If the adjournment is for more than thirty
days,  or if after the  adjournment a new record date is fixed for the adjourned
meeting,  a notice of the  adjourned  meeting  shall be given to each  holder of
Common Stock of record entitled to vote at the meeting.



<PAGE>


                                      - 3 -



     SECTION  8. When a quorum is  present  at any  meeting of holders of Common
Stock,  the  affirmative  vote of the holders of a majority of the Common  Stock
present in person or  represented  by proxy shall  decide any  question  brought
before such meeting,  unless the question is one upon which by express provision
of law, the Certificate of  Incorporation  or these bylaws,  a different vote is
required,  in which case such  express  provision  shall  govern and control the
decision of such question.

     SECTION 9. At every  meeting of the holders of Common  Stock each holder of
Common  Stock shall be entitled to one vote in person or by proxy for each share
of the Common  Stock held by such  stockholder  for each matter with  respect to
which the holders of Common  Stock are  entitled to vote except for the election
of directors, which shall be by cumulative voting as provided in the Certificate
of Incorporation.

     SECTION 10. The stock ledger of the Corporation  shall be the only evidence
as to who are the  stockholders  entitled to examine the stock ledger,  the list
required by Article II, Section 4 and the books of the  Corporation,  or to vote
in person or by proxy at any meeting of stockholders.

     SECTION 11. Votes by written ballot at any meeting of  stockholders  may be
conducted by one or more inspectors,  appointed for that purpose,  either by the
board  of  directors  or by  the  chairman  of the  meeting.  The  inspector  or
inspectors  may decide  upon the  qualifications  of voters and the  validity of
proxies,  may count the votes and declare the result and take such other actions
as required by applicable law.

     SECTION 12. The  Chairman of the Board,  or, in the absence of the Chairman
of the Board, the Chairman of the Executive  Committee or, in the absence of the
Chairman of the Executive Committee, the President, or, in the absence of any of
them, any Vice President, in order of their election,  shall preside at meetings
of stockholders. The secretary of the Corporation shall act as secretary, but in
the absence of the secretary, the presiding officer may appoint a secretary.



<PAGE>


                                      - 4 -

     SECTION 13. (a) No proposal for a stockholder  vote shall be submitted by a
stockholder (a "Stockholder Proposal") to the Corporation's  stockholders unless
the stockholder  submitting such proposal (the  "Proponent")  shall have filed a
written  notice  setting  forth with  particularity  (i) the names and  business
addresses of the  Proponent  and all persons or entities  acting in concert with
the  Proponent;  (ii) the name and address of the  Proponent  and the persons or
entities identified in clause (i), as they appear on the Corporation's books (if
they so  appear);  (iii)  the class  and  number  of  shares of the  Corporation
beneficially  owned by the Proponent  and the persons or entities  identified in
clause (i);  (iv) a  description  of the  Stockholder  Proposal  containing  all
material  information  relating  thereto;  and (v) such other information as the
board of directors  reasonably  determines is necessary or appropriate to enable
the board of  directors  and  stockholders  of the  Corporation  to consider the
Stockholder Proposal.  Upon receipt of the Stockholder Proposal and prior to the
stockholder  meeting at which such Stockholder  Proposal will be considered,  if
the board of directors,  a designated committee of the board of directors or, if
authorized by the board of directors or a committee  thereof,  an officer of the
Corporation,  determines that the information provided in a Stockholder Proposal
does not satisfy the informational  requirements of these bylaws or is otherwise
not in accordance  with law, the  secretary of the  Corporation  shall  promptly
notify such Proponent of the deficiency in the notice. Such Proponent shall have
an opportunity to cure the deficiency by providing additional information to the
secretary  within the period of time,  not to exceed ten days from the date such
deficiency  notice  is  given  to the  Proponent,  determined  by the  board  of
directors or such committee.  If the deficiency is not cured within such period,
or if the board of directors,  or such committee  determines that the additional
information provided by the Proponent,  together with the information previously
provided, does not satisfy the requirements of this Article II, Section 13, then
such  proposal  shall not be  presented  for action at the meeting in  question.
Nothing in this Article II, Section 13, shall in any way limit the discretion of
the board of  directors  to omit any  Stockholder  Proposal in  accordance  with
applicable law.



     (b)  Stockholder  Proposals  shall be  delivered  to the  secretary  at the
principal  executive office of the Corporation not less than sixty days not more
than  one  hundred  and  twenty  days  prior  to  the  date  of the  meeting  of
stockholders  if such  Stockholder  Proposal  is to be  submitted  at an  annual
stockholders meeting (provided,  however,  that if such annual meeting is called
to be  held  before  the  date  specified  in  Article  II,  Section  2, or if a
Stockholder Proposal is to be submitted at a special stockholders  meeting, such
Stockholder  Proposal  shall be so delivered no later than the close of business
on the tenth day  following  the day on which  notice of the date of such annual
stockholders  meeting or special  stockholders  meeting, as the case may be, was
announced on the Dow Jones  newswire  service,  or if such  newswire  service is
unavailable, any national newswire service).



<PAGE>


                                      - 5 -


                                  ARTICLE III.
                                    DIRECTORS

     SECTION 1. The board of directors shall consist of seven (7) directors. The
directors  shall be  elected at the annual  meeting of the  stockholders,  or as
provided in Article II,  Section 5 and each  director  elected shall hold office
until his or her successor is elected and qualified.

     SECTION 2.  Vacancies and newly created  directorships  resulting  from any
increase in the authorized number of directors may be filled only as provided in
this Article III, Section 4.

     SECTION 3. A director or directors may be removed by the  affirmative  vote
of  the  holders  of a  majority  of the  shares  of  Common  Stock  issued  and
outstanding  and  entitled  to vote at a special  meeting of the  holders of the
Common  Stock  called  for such a  purpose.  In the  event of the  removal  of a
director,  the vacancy  created by such removal shall be filled only as provided
in this Article III, Section 4.

     SECTION 4. Board of directors vacancies and newly created directorships may
be filled by a vote of a majority of the directors then in office, although less
than a quorum, or by the sole remaining director.

     SECTION 5. The business and affairs of the Corporation  shall be managed by
or under the  direction  of its board of  directors  which may exercise all such
powers of the  Corporation  and do all such lawful acts and things as are not by
statute or by the  Certificate of  Incorporation  or by these bylaws directed or
required to be exercised or done by the stockholders.

     SECTION 6.  Meetings of the board of  directors,  both regular and special,
may be held at any location  within North  America and may be held outside North
America if two-thirds of the number of directors then in office so authorize. In
the  event a meeting  of the  board of  directors  is to be held  outside  North
America,  notice thereof shall be given at least ten business days prior to such
meeting.



<PAGE>


                                      - 6 -



     SECTION 7. Regular  meetings of the board of directors  may be held at such
time (not less  frequently than four times each year) and at such place as shall
from time to time be determined by the board of directors.

     SECTION 8. Special  meetings of the board of directors may be called by the
president and shall be called by the president upon the written request of three
directors.  Except as otherwise  provided in Article III, Sections 5 and 9, each
notice of a special  meeting of the board of  directors  shall be given at least
five  business  days prior to such  meeting  and shall  identify  the purpose or
purposes of the special  meeting or the business to be transacted at the special
meeting.  Business  transacted at any special  meeting of the board of directors
shall be limited to the purpose or purposes stated in the notice of such special
meeting.

     SECTION 9. At all  meetings of the board of  directors,  the  presence of a
majority  of the  number of  directors  then in  office  shall be  necessary  to
constitute a quorum for the transaction of business,  provided that a quorum may
not be less than  one-third  of the  total  number  of  directors.  The act of a
majority  of the  directors  present at a meeting at which a quorum is  present,
unless a greater number is required by law, by the Certificate of  Incorporation
or by these  bylaws,  shall be the act of the  board of  directors.  If a quorum
shall not be present at any  meeting of the board of  directors,  the  directors
present thereat may adjourn the meeting from time to time,  without notice other
than announcement at the meeting, until a quorum shall be present.

     SECTION 10. Any action  required or permitted to be taken at any meeting of
the  board of  directors  or of any  committee  thereof  may be taken  without a
meeting, if all members of the board of directors or the committee,  as the case
may be, consent  thereto in writing,  and the writing or writings are filed with
the minutes or proceedings of the board of directors or the committee.

     SECTION 11. Members of the board of directors,  or any committee designated
by the board of directors,  shall have the right to  participate in a meeting of
the board of directors,  or any committee,  by means of conference  telephone or
similar communications  equipment by means of which all persons participating in
the meeting  can hear each  other,  and such  participation  in a meeting  shall
constitute presence in person at the meeting.

     SECTION 12. The Corporation may pay the directors  reasonable  compensation
for serving as directors  and as members of one or more  committees of the board
of directors,  the form and amount of which shall be fixed by resolution adopted
by a majority of the number of directors then in office,  and may reimburse such
directors for any reasonable  expenses incurred in attending the meetings of the
board of directors or any committees thereof.


<PAGE>


                                      - 7 -


     SECTION 13. In addition to the committees  designated in these bylaws,  the
board of directors may, by resolution passed by a majority of the whole board of
directors:  (i) designate one or more  committees,  each committee to consist of
one or more of the  directors  of the  Corporation;  (ii) appoint the members of
such committees;  and (iii) designate one or more directors as alternate members
of any  committee,  who may  replace  any absent or  disqualified  member at any
meeting of the committee.

     SECTION 14. The Corporation shall have an Executive  Committee,  to consist
of four or  more  directors  appointed  by a  majority  of the  whole  board  of
directors,  and may appoint one or more  directors as alternate  members of such
Executive  Committee,  who may replace any absent or disqualified  member at any
meeting  of the  Executive  Committee.  Between  the  meetings  of the  board of
directors  and while the board of  directors  is not in session,  the  Executive
Committee  shall have all the powers and exercise all the duties of the board of
directors in the management of the business and affairs of the Corporation  that
may lawfully be delegated to the Executive  Committee by the board of directors,
including,  without  limitation,  the power and authority  granted to committees
pursuant to these bylaws, and the power and authority to declare a dividend,  to
authorize  the issuance of stock and to adopt a  certificate  of  ownership  and
merger  pursuant  to Section 253 of the  Delaware  General  Corporation  Law, as
amended.  The  Executive  Committee  shall adopt its own rules of procedure  and
shall  meet  where  and as  provided  by such  rules.  All  action  taken by the
Executive  Committee  shall be reported to the board of directors at the meeting
thereof next succeeding such action.

     SECTION 15. The Corporation  shall have an Audit  Committee,  to consist of
not less than two directors, appointed by the board of directors. The duties and
responsibilities  of the Audit  Committee  shall be  established by the board of
directors.  The Audit Committee shall adopt its own rules of procedure and shall
meet  where  and as  provided  by such  rules.  All  action  taken by the  Audit
Committee  shall be reported to the board of  directors  at the meeting  thereof
next succeeding such action.



<PAGE>


                                      - 8 -



     SECTION 16. The Corporation shall have a Nominating  Committee,  to consist
of not less than two  directors,  not more than one of whom may be an officer of
the  Corporation,   appointed  by  the  board  of  directors.   The  duties  and
responsibilities  of the Nominating  Committee shall be to select the persons to
be candidates for nomination  for election as directors of the  Corporation  and
make  recommendations  with  respect  thereto  to the  board of  directors.  The
Nominating Committee shall adopt its own rules of procedure and shall meet where
and as provided  by such rules.  All action  taken by the  Nominating  Committee
shall be  reported  to the  board  of  directors  at the  meeting  thereof  next
succeeding such action.

     SECTION 17. In the absence or  disqualification of a member of a committee,
and in the absence of a  designation  by the board of  directors of an alternate
member to replace the absent or  disqualified  member,  the member or members of
the committee present at any meeting and not disqualified  from voting,  whether
or not he or they constitute a quorum, may unanimously appoint another member of
the board of  directors to act at the meeting in the place of any such absent or
disqualified member.

     SECTION 18. Any committee,  to the extent provided in the resolution of the
board  of  directors   establishing   such  committee  and  to  the  extent  not
inconsistent with the Certificate of Incorporation, these bylaws, or the General
Corporation  Law of the State of  Delaware,  shall have and may exercise all the
powers and authority of the board of directors in the management of the business
and affairs of the Corporation, and may authorize the seal of the Corporation to
be fixed to all papers which may require it.

     SECTION 19. Each committee  shall keep regular  minutes of its meetings and
report the same to the board of directors when required.


                                   ARTICLE IV.
                                     NOTICES

     SECTION 1. Whenever,  under the provisions of the statutes, the Certificate
of  Incorporation  or  these  bylaws,  notice  is  required  to be  given to any
stockholder  or director,  such notice shall be in writing,  and shall be deemed
given to each  stockholder  or director (i) upon receipt if delivered in person,
by cable, telegram, telex, telecopy, or other electronic transmission,  (ii) one
day after deposit with a reputable overnight courier service, or (iii) five days
after  deposit in the United  States mail (either by first class,  registered or
certified mail,  postage prepaid),  if sent to such  stockholder's or director's
address as it appears on the records of the Corporation.


<PAGE>


                                      - 9 -

     SECTION 2. Whenever any notice is required to be given under the provisions
of the statutes,  the Certificate of  Incorporation  or these bylaws,  a written
waiver of  notice,  signed by the  person or persons  entitled  to such  notice,
whether before or after the time stated therein,  shall be deemed  equivalent to
notice.  Attendance of a person at a meeting shall constitute a waiver of notice
of such  meeting,  except  when the  person  attends a meeting  for the  express
purpose of objecting at the beginning of the meeting to the  transaction  of any
business because the meeting is not lawfully called or convened.


                                   ARTICLE V.
                                    OFFICERS

     SECTION 1. The officers of the Corporation shall be elected by the board of
directors and shall be a president,  a secretary  and a treasurer.  The board of
directors may also elect one or more  vice-presidents  and one or more assistant
secretaries and assistant  treasurers.  The officers of the Corporation shall be
elected by the vote of a majority of the number of directors then in office. Any
number of offices  may be held by the same  person,  unless the  Certificate  of
Incorporation or these bylaws otherwise provide.

     SECTION 2. The board of  directors at its first  meeting  after each annual
meeting of stockholders  shall elect a president,  a secretary,  a treasurer and
any other  officers  which the board of directors  determines to elect and shall
designate one of such officers as the chief financial officer.

     SECTION 3. The board of directors may elect such other officers and appoint
such  agents as it shall deem  necessary  who shall hold their  offices for such
terms and  shall  exercise  such  powers  and  perform  such  duties as shall be
determined from time to time by the board of directors.

     SECTION 4. The  compensation  of all officers and agents of the Corporation
shall be fixed from time to time by the board of directors.

     SECTION 5. The  officers of the  Corporation  shall hold office until their
successors  are  elected  and  qualified.  Any  officer  elected by the board of
directors  may be removed at any time by the  affirmative  vote of a majority of
the number of directors then in office.  Any vacancy  occurring in any office of
the  Corporation  may be filled by the  affirmative  vote of a  majority  of the
number of directors then in office.


<PAGE>


                                     - 10 -




     SECTION 6. The president of the Corporation,  subject to the control of the
board of directors,  shall supervise the day-to-day  affairs of the corporation,
shall have general and active management  responsibility for the business of the
Corporation,  and  shall see that all  orders  and  resolutions  of the board of
directors are carried into effect.

     SECTION 7. At the  request  of the  president  or in his  absence or in the
event of his inability or refusal to act, the  vice-president,  if there be one,
or in the event there be more than one  vice-president,  the  vice-presidents in
the order  designated by the  directors,  or in the absence of any  designation,
then in the order of their election,  shall perform the duties of the president,
and when so  acting,  shall  have all the  powers of and be  subject  to all the
restrictions upon the president.  The  vice-presidents  shall perform such other
duties and have such  other  powers as the board of  directors  may from time to
time prescribe.

     SECTION 8. The secretary shall attend all meetings of the  stockholders and
record all the  proceedings of the meetings of the  Corporation and of the board
of directors  in a book or books to be kept for that  purpose and shall  perform
like duties for the standing committees when required. The secretary shall give,
or cause to be given,  notice of all  meetings of the  stockholders  and special
meetings of the board of  directors,  and shall perform such other duties as may
be  prescribed  by  the  board  of  directors  or  the  president,  under  whose
supervision  the  secretary  shall be. The  secretary  shall have custody of the
corporate seal of the Corporation and the secretary,  or an assistant secretary,
shall have authority to affix the same to any  instrument  requiring it and when
so affixed, it may be attested by the secretary's  signature or by the signature
of such assistant  secretary.  The board of directors may give general authority
to any other  officer  to affix the seal of the  Corporation  and to attest  the
affixing by his  signature.  The secretary  shall see that all books,  reprints,
statements,  certificates  and other documents and records required by law to be
kept or filed are properly kept or filed, as the case may be.

     SECTION 9. The  assistant  secretary,  if there be one, or if there be more
than one, the  assistant  secretaries  in the order  determined  by the board of
directors,  or if there  be no such  determination,  then in the  order of their
election,  shall at the  request of the  secretary  or in his  absence or in the
event of his inability or refusal to act,  perform the duties of the  secretary,
and  when so  acting,  shall  have  all the  powers  and be  subject  to all the
restrictions  upon the secretary.  The assistant  secretaries shall perform such
other duties and have such other powers as the board of directors  may from time
to time prescribe.



<PAGE>


                                     - 11 -



     SECTION 10. The treasurer shall have the custody of the corporate funds and
securities   and  shall  keep  full  and  accurate   accounts  of  receipts  and
disbursements in books belonging to the Corporation and shall deposit all moneys
and other valuable  effects in the name and to the credit of the  Corporation in
such depositories as may be designated by the board of directors.  The treasurer
shall  disburse the funds of the  Corporation  as may be ordered by the board of
directors,  taking proper vouchers for such  disbursements,  and shall render to
the president,  and to the board of directors at its regular  meetings,  or when
the board of  directors  so  requires,  an  account of all his  transactions  as
treasurer and of the financial condition of the Corporation.

     SECTION 11. If required by the board of directors, the treasurer shall give
the  Corporation a bond in such sum and with such surety or sureties as shall be
satisfactory  to the board of  directors  for the  faithful  performance  of the
duties of his office and for the restoration to the Corporation,  in case of his
death,  resignation,  retirement or removal from office,  of all books,  papers,
vouchers,  money and other  property of whatever kind in his possession or under
his control belonging to the Corporation.

     SECTION 12. The assistant treasurer,  if there be one, or if there shall be
more than one, the assistant  treasurers in the order determined by the board of
directors,  or if there  be no such  determination,  then in the  order of their
election,  shall,  at the request of the  treasurer  or in his absence or in the
event of his inability or refusal to act,  perform the duties of the  treasurer,
and  when so  acting,  shall  have  all the  powers  and be  subject  to all the
restrictions  upon the treasurer.  The assistant  treasurers  shall perform such
other duties and have such other powers as the board of directors  may from time
to time prescribe.

     SECTION 13. The chief  financial  officer  shall have such duties as may be
assigned by the board of directors.


<PAGE>


                                     - 12 -

                                   ARTICLE VI.
                              CERTIFICATES OF STOCK

     SECTION 1. Every stockholder of the Corporation shall be entitled to have a
certificate  in the name of the  Corporation  signed  by the  president  and the
secretary or an assistant secretary of the Corporation, certifying the number of
shares owned by him in the Corporation.  If the Corporation  shall be authorized
to issue  more than one class of  capital  stock or more than one  series of any
class,  the  powers,  designations,  preferences  and  relative,  participating,
optional  or other  special  rights  of such  class of  capital  stock or series
thereof and the qualifications,  limitations or restrictions of such preferences
and/or  rights shall be set forth in full or  summarized  on the face or back of
the  certificate  which the  Corporation  shall issue to represent such class or
series of capital stock;  provided that, except as otherwise provided in Section
202 of the  General  Corporation  Law of the State of  Delaware,  in lieu of the
foregoing  requirements,  there  may be set  forth  on the  face  or back of the
certificate  which the Corporation shall issue to represent such class or series
of capital stock, a statement that the  Corporation  will furnish without charge
to each  stockholder who so requests the powers,  designations,  preferences and
relative,  participating,  optional  or other  special  rights of each  class of
capital  stock  or  series  thereof  and  the  qualifications,   limitations  or
restrictions of such preference and/or rights.

     SECTION 2. Any or all of the signatures on a certificate  may be facsimile.
In case  any  officer,  transfer  agent or  registrar  who has  signed  or whose
facsimile  signature has been placed upon a certificate  shall have ceased to be
such officer,  transfer agent or registrar before such certificate is issued, it
may be  issued  by the  Corporation  with the same  effect  as if they were such
officer, transfer agent or registrar at the date of issue.

     SECTION  3.  The  board  of  directors  may  direct  a new  certificate  or
certificates   to  be  issued  in  place  of  any  certificate  or  certificates
theretofore  issued by the  Corporation  alleged  to have been  lost,  stolen or
destroyed,  upon the making of an affidavit of that fact by the person  claiming
the certificate of stock to be lost, stolen or destroyed.  When authorizing such
issue of a new certificate or  certificates,  the board of directors may, in its
discretion  and as a condition  precedent to the issuance  thereof,  require the
owner of such lost,  stolen or destroyed  certificate  or  certificates,  or his
legal  representative,  to advertise the same in such manner as it shall require
and/or to give the  Corporation a bond in such sum as it may direct as indemnity
against any claim that may be made against the  Corporation  with respect to the
certificate alleged to have been lost, stolen or destroyed.

     SECTION 4. Upon  surrender to the  Corporation or the transfer agent of the
Corporation  of a certificate  for shares duly endorsed or accompanied by proper
evidence of succession,  assignation  or authority to transfer,  it shall be the
duty of the  Corporation  to  issue a new  certificate  to the  person  entitled
thereto, cancel the old certificate and record the transaction upon its books.



<PAGE>


                                     - 13 -



     SECTION 5. In order that the  Corporation  may determine  the  stockholders
entitled  to  notice  of or to  vote  at  any  meeting  of  stockholders  or any
adjournment  thereof,  or entitled  to express  consent to  corporate  action in
writing  without a meeting,  or entitled to receive  payment of any  dividend or
other  distribution or allotment of any rights, or entitled to exchange of stock
or for the purpose of any other lawful action, the board of directors may affix,
in advance,  a record date, which shall not be more than sixty nor less than ten
days  before  the date of such  meeting,  nor more than  sixty days prior to any
other action. A determination of stockholders of record entitled to notice of or
to vote at a meeting  of  stockholders  shall  apply to any  adjournment  of the
meeting;  provided,  however,  that the board of directors  may fix a new record
date for the adjourned meeting.


     SECTION 6. The  Corporation  shall be entitled to recognize  the  exclusive
right of a person  registered  on its books as the  owner of  shares of  capital
stock of the Corporation to receive  dividends,  and to vote as such owner,  and
shall not be bound to recognize  any  equitable or other claim to or interest in
such share or shares of capital stock on the part of any other  person,  whether
or not it shall  have  express  or other  notice  thereof,  except as  otherwise
provided by the laws of the State of Delaware.


                                  ARTICLE VII.
                                   PROCUREMENT

     Each Director  shall have the right to review in their entirety any and all
proposals  received by the Corporation in response to any requests for proposals
that may be issued by the  Corporation  for contracts,  purchase orders or other
similar  binding  commitments  to be  entered  into by,  or on  behalf  of,  the
Corporation. The board of directors' review of proposals shall be conducted in a
manner consistent with the requirements of the request for proposals to maintain
the confidentiality of proprietary information contained in the proposals.





<PAGE>


                                     - 14 -


                                  ARTICLE VIII.
                    INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Each  person who is or was or had agreed to be a director or officer of the
Corporation  shall be  indemnified  by the  Corporation  to the  fullest  extent
permitted or authorized by the General  Corporation Law of the State of Delaware
or any other  applicable  laws as  presently  or  hereafter  in effect.  Without
limiting the generality of the foregoing,  the Corporation may enter into one or
more  agreements  with any person which provide for  indemnification  greater or
different than that provided in this Article VIII. Any repeal or modification of
this Article VIII shall not adversely  affect any right or  protection  existing
hereunder immediately prior to such repeal or modification. The Corporation may,
but shall not be obligated  to,  maintain  insurance,  at its  expense,  for the
benefit of the Corporation and of any person to be indemnified.




                                   ARTICLE IX.
                               GENERAL PROVISIONS

     SECTION 1. Dividends upon the capital stock of the Corporation,  subject to
the provisions of the Certificate of  Incorporation,  if any, may be declared by
the board of  directors  at any  regular or special  meeting,  pursuant  to law.
Dividends  may be paid in cash,  in  property,  or in shares of  capital  stock,
subject to the provisions of the Certificate of Incorporation.

     SECTION 2. Before  payment of any  dividend,  there may be set aside out of
any funds of the  Corporation  available for  dividends  such sum or sums as the
board of directors from time to time, in their absolute discretion, think proper
as a reserve or reserves to meet contingencies,  or for equalizing dividends, or
for repairing or maintaining any property of the Corporation,  or for such other
purpose as the board of directors shall believe conducive to the interest of the
Corporation,  and the board of directors  may modify or abolish any such reserve
in the manner in which it was created.

     SECTION  3. All checks or  demands  for money and notes of the  Corporation
shall be signed by such  officer or officers or such other  person or persons as
the board of directors may from time to time designate.



<PAGE>


                                     - 15 -


     SECTION 4. The fiscal year of the  Corporation  shall end on December 31 of
each year or as otherwise fixed by resolution of the board of directors.

     SECTION 5. The board of  directors  may adopt a corporate  seal and use the
same by  causing  it or a  facsimile  thereof  to be  impressed  or  affixed  or
reproduced or otherwise.

                                   ARTICLE X.
                                   AMENDMENTS

     Except as otherwise  provided by the Certificate of  Incorporation or these
bylaws,  these bylaws may be altered,  amended or repealed or newI bylaws may be
adopted only by the vote of either (i) three-fourths of the members of the board
of directors  then in office or (ii) the holders of two-thirds of the issued and
outstanding shares of Common Stock.

     Approved by  three-fourths  of the members of the board of  directors as of
the 23rd day of September, 1999.


                                                  /s/Randy S. Segal
                                                  Randy S. Segal
                                                  Secretary







                                   Exhibit 4.4



                      AMERICAN MOBILE SATELLITE CORPORATION
================================================================================


                1999 STOCK OPTION PLAN FOR NON-EMPLOYEE DIRECTORS


                                    ARTICLE I
                            RESTATEMENT AND PURPOSES

         American  Mobile  Satellite  Company  (the  "Company")  maintained  the
American Mobile  Satellite  Corporation  1994 Stock Option Plan for Non-Employee
Directors (the "Prior Plan").  The Prior Plan has been amended and restated,  as
set forth  herein,  effective  March 25,  1999,  subject to the  approval of the
shareholders  of the Company  within twelve months of such  effective  date (the
"Plan").  Notwithstanding anything herein to the contrary,  nothing in this Plan
shall  adversely  affect  the rights or  obligations  of any holder of an Option
granted under the Prior Plan without such person's approval.

         The  purposes  of the Plan are to attract  and retain the  services  of
experienced  and  knowledgeable  non-employee  Directors  of the  Company and to
provide an incentive for such Directors to increase their proprietary  interests
in the Company's long-term success and progress.


                                   ARTICLE II
                           SHARES SUBJECT TO THE PLAN

         Subject to adjustment in accordance  with Article VI hereof,  the total
number of shares of the Company's  Common  Stock,  $.01 par value per share (the
"Common Stock"), for which options may be granted under the Plan is 100,000 (the
"Shares,"  including,  for the purposes of this Article II, the Prior Plan). The
Shares  shall be shares of Common  Stock  presently  authorized  but unissued or
subsequently  acquired by the Company and shall include shares  representing the
unexercised  portion  of any  option  granted  under the Plan  which  expires or
terminates without being exercised in full.


                                   ARTICLE III
                           ADMINISTRATION OF THE PLAN

         The administrator of the Plan (the "Plan  Administrator")  shall be the
Board of  Directors  ("Board")  or a committee  or  committees  appointed by the
Board.  Subject to the terms of the Plan, the Plan Administrator  shall have the
power to construe the provisions of the Plan, to determine all questions arising
thereunder  and  to  adopt  and  amend  such  rules  and   regulations  for  the
administration  of the  Plan as it may deem  desirable.  No  member  of the Plan
Administrator  shall  participate in any vote by the Plan  Administrator  on any
matter materially affecting the rights of any such member under the Plan.

                                      - 1 -


<PAGE>



                                   ARTICLE IV
                           PARTICIPATION IN THE PLAN

         Each member of the Board  elected or appointed  who is not otherwise an
employee of the Company or any  subsidiary  (an  "Eligible  Director")  shall be
eligible to receive the following option grants under the Plan:

1.       Initial Grant

         An initial  grant (an "Initial  Grant") of an option to purchase  5,000
Shares shall  automatically be granted to each Eligible Director effective March
25, 1999, and to each person who becomes an Eligible Director following the date
of adoption of the Plan by the Board upon the earlier of the Eligible Director's
initial election or appointment as a Director of the Company.

         Each Initial  Grant shall be fully vested and  immediately  exercisable
upon grant.

2.       Additional Grants

         Commencing on July 1, 1999, each Eligible Director shall  automatically
receive an  additional  grant (an  "Additional  Grant") of an option to purchase
2,500 Shares on July 1 of each year (an "Additional Grant Date"); provided, that
an Eligible  Director who has  received an Initial  Grant within four (4) months
prior to an Additional  Grant Date shall not receive an  Additional  Grant until
the next year's Additional Grant Date.

         Each Additional Grant shall be fully vested and immediately exercisable
upon grant.

3.       Discretionary Grants

         The Plan Administrator shall have the authority and discretion to grant
additional  options to  Eligible  Directors  at such times and on such terms and
conditions as it may determine.


                                   ARTICLE V
                                  OPTION TERMS

         Each  option  grant  to an  Eligible  Director  under  the Plan and the
issuance of Shares thereunder shall be subject to the following terms:

1.       Option Agreement

         Each option grant to an Eligible Director under Section 3 of Article IV
of the Plan shall have such terms and  conditions  as may be  determined  by the
Plan Administrator. Each option grant to an Eligible Director under Section 1 or
2 of  Article  IV of the Plan and the  issuance  of shares  thereunder  shall be
subject to the term set forth in this Article V.

2.       Option Exercise Price

         The option exercise price for an option granted under the Plan shall be
the fair market value of the Shares covered by the option at the time the option
is granted.  For purposes of the Plan,  "fair market value" of a Share means the
amount  equal  to the  average  of the  high  and 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  trade  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 Plan Administrator
in good faith for such purposes.

3.       Time and Manner of Exercise of Option

         Each option may be  exercised  in whole or in part at any time and from
time to time, subject to shareholder  approval of the Plan;  provided,  however,
that the Company shall not be required to issue fractional shares.

         Any option may be exercised  by giving  written  notice,  signed by the
person  exercising the option,  to the Company stating the number of Shares with
respect to which the option is being  exercised,  accompanied by payment in full
for  such  Shares,  which  payment  may be in whole or in part (i) in cash or by
check, (ii) in shares of Common Stock (by delivery or attestation) already owned
for at least six (6) months by the person exercising the option,  valued at fair
market  value at the time of such  exercise,  or (iii) by delivery of a properly
executed exercise notice, together with a copy of irrevocable  instructions to a
broker,  to properly  deliver to the Company the amount of sale or loan proceeds
to pay the exercise plan.

4.       Term of Options

         Each option  shall  expire ten (10) years from the date of the granting
thereof, but shall be subject to earlier termination as follows:

                  (a)      In the event that an optionee ceases to be a Director
         of the Company for any reason other than the death of the optionee, the
         options granted to such optionee may be exercised by  the optionee only
         within  seven (7) months after  the  date  the  optionee ceases to be a
         Director of the Company.

                  (b) In the event of the death or an optionee,  whether  during
         the  optionee's  service  as a  Director  or during the seven (7) month
         period referred to in Section 4(a), the options granted to the optionee
         shall be  exercisable,  and such options shall expire unless  exercised
         within twelve (12) months after the date of the  optionee's  death,  by
         the legal representatives or the estate of such optionee, by any person
         or persons whom the optionee shall have  designated in writing on forms
         prescribed by and filed with the Company or, if no such designation has
         been made, by the person or persons to whom the optionee's  rights have
         passed by will or the laws of descent and distribution.

5.       Transferability

         Except as otherwise  permitted by the Plan Agreement or specified in an
Agreement, during an optionee's lifetime, an option may be exercised only by the
optionee  or  pursuant  to the terms of a  qualified  domestic  relations  order
("QDRO") as defined under the Internal Revenue Code of 1986, as amended. Options
granted under the Plan and the rights and privileges conferred thereby shall not
be  subject  to  execution,  attachment  or  similar  process  and  may  not  be
transferred,  assigned,  pledged  or  hypothecated  in any  manner  (whether  by
operation  of law or  otherwise)  other than by will or the  applicable  laws of
descent and  distribution  or  pursuant to the terms of a QDRO,  except that the
Plan  Administrator  may permit a recipient of an option to designate in writing
during the optionee's  lifetime a beneficiary to receive and exercise options in
the event of the  optionee's  death (as provided in Section 4(b) of this Article
V). Any attempt to transfer,  assign, pledge, hypothecate or otherwise dispose o
any  option  under  the Plan or of any  right or  privilege  conferred  thereby,
contrary to the provisions of the Plan, or the sale or levy or any attachment or
similar process upon the rights and privileges conferred thereby,  shall be null
and void.

6.       Participant's or Successor's Rights as Shareholder

         Neither the  recipient of an option  under the Plan nor the  optionee's
successor(s)  in interest  shall have any rights as a shareholder of the Company
with  respect to any Shares  subject to an option  granted to such person  until
such person becomes a holder of record of such Shares.

7.       Limitation as to Directorship

         Neither  the Plan nor the  granting  of an option nor any other  action
taken  pursuant to the Plan shall  constitute or be evidence of any agreement or
understanding, express or implied, that an optionee has a right to continue as a
Director for any period of time or at any particular rate of compensation.

8.       Regulatory Approval and Compliance

         The  Company  shall  not  be  required  to  issue  any  certificate  or
certificates  for Shares upon the exercise of an option  granted under the Plan,
or record as a holder of record of Shares the name of the individual  exercising
an option under the Plan, without obtaining to the complete  satisfaction of the
Plan Administrator the approval of all regulatory bodies deemed necessary by the
Plan Administrator,  and without complying, to the Plan Administrator's complete
satisfaction,  with all rules and regulations under federal,  state or local law
deemed applicable by the Plan Administrator.


                                   ARTICLE VI
                              CAPITAL ADJUSTMENTS

         The  aggregate  number  and class of Shares  for which  options  may be
granted  under  the  Plan,  the  number  and  class of  Shares  covered  by each
outstanding  option and the exercise  price per Share thereof (but not the total
price) shall all be equitably adjusted by the Plan Administrator to reflect such
events   as  stock   dividends,   stock   splits,   or   exchange   of   shares,
recapitalizations,  mergers,  consolidations,  reorganizations  or  any  similar
transactions of or by the Company.

         In the event of any  adjustment in the number of Shares  covered by any
option,   any  fractional   Shares  resulting  from  such  adjustment  shall  be
disregarded  and each such  option  shall  cover only the number of full  Shares
resulting from such adjustment.


                                  ARTICLE VII
                             EXPENSES OF THE PLAN

         All costs and expenses of the adoption and  administration  of the Plan
shall be borne by the  Company;  none of such  expenses  shall be charged to any
optionee.


                                  ARTICLE VIII
                    EFFECTIVE DATE AND DURATION OF THE PLAN

         The Plan, as an amendment and restatement of  the  Prior Plan, shall be
effective upon adoption by the Board subject to  the approval of shareholders of
the Company.  The Plan shall continue in effect until it is terminated by action
of  the  Board  or  the Company's shareholders,  but such  termination shall not
affect the then-outstanding terms of any options.



                                   ARTICLE IX
                     TERMINATION AND AMENDMENT OF THE PLAN

         The Board may  amend,  terminate  or  suspend  the Plan or any  portion
thereof at any time, in its sole and absolute discretion.


                                   ARTICLE X
                           COMPLIANCE WITH RULE 16B-3

         It is the intention of  the Company that the Plan comply in all respect
with Rule 16b-3  promulgated  under Section 16(b) of the Securities Exchange Act
of 1934, as amended ("Exchange Act").  Therefore, if any Plan provision is later
found not be in compliance with Rule 16b-3, that provision shall  be deemed null
and void, and in all  events the Plan shall be construed in favor of its meeting
the requirements of Rule 16b-3.





                                      - 2 -






                                   Exhibit 4.5





                      AMERICAN MOBILE SATELLITE CORPORATION
================================================================================


                   NONQUALIFIED STOCK OPTION LETTER AGREEMENT

TO:      __________________                                  Option No. ________

         We are  pleased to inform you that,  pursuant  to the  American  Mobile
Satellite  Corporation's (the "Company") 1999 Stock Option Plan for Non-Employee
Directors (the "Plan"),  you have been granted a  nonqualified  stock option for
the purchase of _____ shares of the Company's  Common Stock at an exercise price
of $_____ per share. A copy of the Plan is attached and  incorporated  into this
Agreement by reference.  If the Plan is not approved by the  shareholders of the
Company, this option will be invalid and void ab initio.

         The  terms of the  option  are  as  set forth in  the Plan and  in this
Agreement.  The most important of terms set forth  in the Plan are summarized as
follows:

         Term:  The option  will expire  upon the earlier of ten (10) years from
the date of grant or within seven (7) months of your termination of service as a
Director of the Company, unless sooner terminated.

         Exercise:  During  your lifetime only you can exercise the option.  The
Plan also provides for exercise of the option in accordance with  the terms of a
qualified  domestic  relations  order ("QDRO") as  defined  under  the  Internal
Revenue Code of 1986, as amended, (the "Code") or by the personal representative
of your estate, a designated  beneficiary  or other beneficiary  of  your estate
following your death.  You may use the  Notice of Exercise of Nonqualified Stock
Option in the form attached to this Agreement when you exercise the option.

         Payment for Shares:  The option may be exercised by the delivery of:

         (a) Cash,  personal  check (unless,  at the time of exercise,  the Plan
Administrator determines otherwise), bank certified or cashier's check;

         (b)     Unless the Plan Administrator in its sole discretion determines
otherwise,  shares  of  Common Stock  of  the  Company (either  by  delivery  or
attestation) held by you  for a period of at  least six (6) months having a fair
market value at the time  of exercise, as determined in  good faith  by the Plan
Administrator, equal to the exercise price; or

         (c)      A  properly executed exercise notice together with irrevocable
instructions  to  the  Company-designated  broker  for   cashless  exercises  to
promptly deliver  to the Company the amount of sale or  loan proceeds to pay the
exercise price.

         Termination:  If  you cease to  be a  Director of the  Company  for any
reason  other  than death, and unless by its terms this option sooner terminates
or expires, then you may exercise, for a seven (7) month period, that portion of
your option which  is exercisable at  the time of such cessation, but the option
shall  terminate at  the end  of such  period following such cessation as to all
shares for which it has not theretofore been exercised.

         Death of Optionee:  If  you  die  while serving as a  Director  of  the
Company  or within  the  seven (7) month  period  following  cessation  of  such
service, this  option may, to  the  extent that  you would have been entitled to
exercise this option, be exercised within twelve (12) months after your death by
the personal representative of  your estate  or by the person or persons to whom
your rights  under  this  option  shall  pass  by  will,  designation, or by the
applicable laws of descent and distribution, unless sooner terminated.

         Status of Shareholder:   Neither you  nor any person or persons to whom
your  rights and privileges under this option may  pass shall be, or have any of
the rights or privileges of, a shareholder of the Company with respect to any of
the  shares  issuable  upon  the  exercise  of this option unless and until this
option has been exercised.

         Continuation of Status as Director:   Nothing  in  this Agreement shall
confer  upon  you  any  right  to  continue  as a Director of the Company, or to
interfere in any way with the right of  the Company to terminate your service as
a Director of the Company at any time.

         Transfer of Option: This option and the rights and privileges conferred
hereby may not be transferred,  assigned,  pledged or hypothecated in any manner
(whether by operation of law or otherwise) other than by will, by the applicable
laws of descent and  distribution  or pursuant to the terms of a QDRO, and shall
not be subject to  execution,  attachment  or similar  process.  Any  attempt to
transfer,  assign, pledge, hypothecate or otherwise dispose of this option or of
any  right  or  privilege  conferred  hereby,  contrary  to the  Code  or to the
provisions  of this  Agreement,  or sale or levy or any  attachment  or  similar
process upon the rights and privileges conferred hereby shall be null and void.

         Vesting:   The  option  shall  be  fully  vested and become immediately
exercisable, subject to shareholder approval of the Plan.

         Holding Period:   Shares of Common  Stock obtained upon the exercise of
this option  may  not be sold until six (6) months after the date the option was
granted.

         Date of Grant:  The date of grant of the option is March 25, 1999.

         YOUR  PARTICULAR ATTENTION  IS  DIRECTED TO ARTICLE V, SECTION 8 OF THE
PLAN  WHICH DESCRIBES CERTAIN IMPORTANT CONDITIONS RELATING TO FEDERAL AND STATE
SECURITIES  LAWS THAT  MUST  BE SATISFIED BEFORE THE OPTION CAN BE EXERCISED AND
BEFORE THE COMPANY CAN ISSUE ANY SHARES TO YOU.  THE COMPANY INTENDS TO MAINTAIN
AN  EFFECTIVE  REGISTRATION  STATEMENT  WITH  RESPECT TO THE SHARES THAT WILL BE
ISSUED UPON EXERCISE OF THIS OPTION BUT HAS NO OBLIGATION TO DO SO.  IF THERE IS
NO EFFECTIVE REGISTRATION STATEMENT, YOU WILL NOT BE ABLE TO EXERCISE THE OPTION
OR SELL THE OPTION SHARES UNLESS  EXEMPTIONS FROM REGISTRATION UNDER FEDERAL AND
STATE SECURITIES LAWS ARE AVAILABLE.  SUCH EXEMPTIONS ARE VERY LIMITED AND MIGHT
BE  UNAVAILABLE, CONSEQUENTLY, YOU  MIGHT HAVE  NO  OPPORTUNITY  TO EXERCISE THE
OPTION AND TO RECEIVE SHARES UPON SUCH EXERCISE.

         Please execute the Acceptance  and  Acknowledgement  set forth below on
the enclosed copy of this Agreement and return it to the undersigned.

                                        Very truly yours,

                                        AMERICAN MOBILE SATELLITE
                                        CORPORATION



                                        By:


Accepted and Acknowledged
this ____ day of _______________, 199__



_____________________________                     _________________________
Optionee's Signature                              Taxpayer I.D. Number



                                      - 1 -


<PAGE>



                 NOTICE OF EXERCISE OF NONQUALIFIED STOCK OPTION


To:  American Mobile Satellite Corporation

         I, a resident  of the State of  _________________,  hereby  exercise my
nonqualified stock option granted by American Mobile Satellite  Corporation (the
"Company") on _________________,  199__, subject to all the terms and provisions
thereof and of the 1999 Stock Option Plan for Non-Employee Directors referred to
therein,  and notify  the  Company of my desire to  purchase  _______  shares of
Common  Stock  of the  Company  (the  "Securities")  at the  exercise  price  of
$____________ per share which were offered to me pursuant to said option.




Dated:



___________________________                       _____________________________
Taxpayer I.D. Number                              Optionee's Signature



                                                  Address:











                                      - 2 -


<PAGE>


                                     RECEIPT


         ___________________________________  hereby  acknowledges  receipt from
_______________________________  in payment  for  ____________  shares of Common
Stock of American  Mobile  Satellite  Corporation,  a Delaware  corporation,  of
$_______ in the form of:


/_/       Cash
/_/       Check (personal, cashier's or bank certified)

_______  shares of the  Company's  Common  Stock,  fair market value $______ per
share held by the Optionee for a period of at least six (6) months

Copy of irrevocable instructions to Broker



Date:                                      For:
                                           American Mobile Satellite Corporation




                                      - 3 -




                                    Exhibit 5

                      AMERICAN MOBILE SATELLITE CORPORATION

                                                           September 23, 1999

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

Ladies and Gentlemen:

         As  set  forth  in  the   registration   statement  on  Form  S-8  (the
"Registration  Statement")  filed by American Mobile Satellite  Corporation (the
"Company"), with the Securities and Exchange Commission under the Securities Act
of 1933, as amended,  relating to 50,000  shares of the Company's  common stock,
par value  $.01 per share (the  "Shares"),  that may be issued  pursuant  to the
Company's  1999 Stock  Option  Plan for  Non-employee  Directors  (the  "Plan"),
certain legal matters in connection  with the Shares ar being passed upon by me.
At your request,  this opinion is being furnished to you for filing as Exhibit 5
to the Registration Statement.

         In my capacity as General  Counsel of the Company,  I have examined the
Certificate of Incorporation and Bylaws of the Company, each as amended to date,
the  originals,  or copies,  certified  or  otherwise  identified,  of corporate
records of the Company,  including minute books of the Company,  certificates of
public  officials  and of  representatives  of the  Company,  statutes and other
instruments  and  documents as a basis for the  opinions  expressed  herein.  In
giving such opinions,  I have relied on  certificates of officers of the Company
with  respect to the  accuracy  of certain  factual  matters  contained  in such
certificates.

         On the  basis  of  the  foregoing,  and  subject  to  the  assumptions,
limitations and qualifications set forth herein, I am of the opinion that:

         1.   The  Company  is  a  corporation  duly  incorporated  and  validly
existing under the laws of the state of Delaware.

         2.   The  issuance of  the Shares,  upon  exercise of options  pursuant
to the terms of the Plan,  has been duly  authorized by all necessary  corporate
action on the part of the Company,  and when the Shares are issued upon exercise
of  options  in  accordance  with  the  terms  of the Plan  against  payment  in
consideration  therefor,  the  Shares  will be  validly  issued,  fully paid and
nonassessable.

         The opinions set forth above are limited in all respects to the General
Corporation Law of the state of Delaware as in effect on the date hereof.

         I hereby  consent  to the  filing of this  opinion  as Exhibit 5 to the
Registration Statement.


                                                     Sincerely,
                                                     /s/Randy S. Segal
                                                     Randy S. Segal
                                                     General Counsel






<PAGE>





                                  Exhibit 23.2

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the use of our report
dated March 29, 1999 (except with respect to the matter discussed in Note 18, as
to  which  the  date  is  July  7,  1999)  and to  all  references  to our  Firm
incorporated  by reference in or made a part of this  registration  statement on
Form S-8. Our report dated March 29, 1999 included in American Mobile  Satellite
Corporation's  Form  10-K for the year  ended  December  31,  1998 is no  longer
appropriate  since restated  financial  statements  have been  presented  giving
effect to a business combination.


/s/ Arthur Andersen LLP
Vienna, VA
October 11, 1999









                                  Exhibit 23.3


               CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS


We consent to the  incorporation  by reference of our report dated  February 12,
1999 in this  registration  statement on Form S-8 of American  Mobile  Satellite
Corporation (the "Company") with respect to the  consolidated  balance sheets of
XM Satellite Radio Holdings Inc. and Subsidiary (a development stage company) as
of  December  31,  1998 and  1997 and the  related  consolidated  statements  of
operations,  stockholders'  equity  (deficit) and cash flows for the years ended
December  31,  1998 and 1997 and for the perio from  December  15, 1992 (date of
inception) to December 31, 1998.

Our report,  dated  February 12, 1999,  contains an  explanatory  paragraph that
states that XM Radio has not commenced operations,  has negative working capital
of  $130,341,000  and is dependent upon  additional  debt and equity  financings
which raise  substantial  doubt about XM Radio's  ability to continue as a going
concern.  The consolidated  financial  statements of XM Radio do not include any
adjustments that might result from the outcome of that uncertainty.


                                          /s/ KPMG LLP
McLean, VA
October 11, 1999











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