Document:

EXHIBIT 10.42c

                                 FIRST AMENDMENT

                                       TO

                    AMENDED AND RESTATED ASSET SALE AGREEMENT

     THIS FIRST  AMENDMENT TO AMENDED AND RESTATED  ASSET SALE  AGREEMENT  (this
"Amendment"),  is made as of October 12, 2001, by and between  Mobile  Satellite
Ventures  LLC, a Delaware  limited  liability  company  (formerly  named Motient
Satellite  Ventures  LLC)  ("Newco")  and  Motient  Services  Inc.,  a  Delaware
corporation ("Motient Services").

     WHEREAS, TMI Communications and Company Limited Partnership ("TMI"), Newco,
Motient Corporation ("Parent") and the Investors named therein entered into that
certain  January  2001  Investment  Agreement  dated as of  January 8, 2001 (the
"January Investment Agreement").

     WHEREAS,  in connection with the January  Investment  Agreement,  Newco and
Motient  Services  entered  into that certain  Amended and  Restated  Asset Sale
Agreement dated as of January 8, 2001 (the "Sale Agreement"),  pursuant to which
Motient  Services  agreed to sell and Newco  agreed to  purchase  certain of the
assets and assume  certain of the  liabilities  of the Satellite  Communications
Business.

     WHEREAS,  TMI, Parent,  Newco, and the Investors named therein entered into
the Amended and Restated  Investment  Agreement dated as of the date hereof (the
"October Investment Agreement") which amends and restates the January Investment
Agreement.

     WHEREAS, Newco and Motient Services desire to make certain modifications to
the Sale Agreement to reflect the October Investment Agreement.

     NOW,  THEREFORE,  for good and  valuable  consideration,  the  receipt  and
sufficiency of which are hereby acknowledged, the parties agree as follows:

     1.  Amendments to Sale  Agreement.  The Sale Agreement is hereby amended as
follows:

     (a) The following  definitions contained in Exhibit A to the Sale Agreement
are hereby deleted in their entirety and replaced with the following:

          "Investment   Agreement"  means  that  certain  Amended  and  Restated
     Investment  Agreement  dated as of October  12,  2001 by and among  Motient
     Corporation,  Newco, TMI Communications Company Limited Partnership and the
     other parties named therein.

     (b) The term "Investor Option" contained in Exhibit A to the Sale Agreement
is hereby deleted in its entirety.

     (c) The term "Shared  Assets"  contained in Exhibit A to the Sale Agreement
is hereby deleted in its entirety.

     (d) The  following  definition  is  hereby  added to  Exhibit A to the Sale
Agreement:

          "Leased  Assets"  shall  have the  meaning  given such term in Section
     2.3(x)."

     (e)  Section  2.3(b) is hereby  revised  to delete  the words  "subject  to
regulatory approval,".

     (f)  Section  2.3(f)  is  hereby  revised  to  delete  the  words  "and the
Landlord's consent".

     (g)  Section  2.3(t)  is  hereby  revised  to  delete  the  words  "Section
2.4(a)(vi)" and replace them with "Section 2.4(a)(v)".

     (h)  Section  2.3(v) is hereby  revised to delete the words "and the Shared
Assets listed on Schedule 2.3(v) to the Disclosure Schedule".

     (i) The following clause is hereby added to the end of Section 2.3:

          "(x)  the  assets  listed  on  Schedule  2.3(x)  hereof  (the  "Leased
     Assets")."

     (j) Section  2.4(a) is hereby deleted in its entirety and replaced with the
following:

          "(a)  "Excluded  Assets"  consist of (i) Motient  Services'  corporate
     charter,  qualifications  to  conduct  business  as a foreign  corporation,
     arrangements  with registered  agents  relating to foreign  qualifications,
     taxpayer and other  identification  numbers,  seals,  minute  books,  stock
     transfer books,  blank stock  certificates,  and other  documents  relating
     solely to the organization, maintenance or existence of Motient Services as
     a corporation,  (ii) Motient  Services' rights with respect to Intercompany
     Agreements  (as  defined  herein),  (iii)  except as  provided  in Sections
     2.3(p)(t)  and (u) hereof,  cash and cash  equivalents  (including  without
     limitation  the  Purchase  Price),  (iv)  Motient  Services'  rights to and
     interests  in the  trademark  "Motient,"  the Motient logo and all goodwill
     related  thereto,  (v) that portion of the accounts  receivable  of Motient
     Services  that relate to  federal,  state and local  excise,  sales and use
     taxes required to be paid by Motient  Services  under Section  2.5(b)(xiii)
     hereof  and,  (vi) the  assets  listed  on  Schedule  2.4.  Notwithstanding
     anything else in this Amended Sale  Agreement to the contrary,  in addition
     to the foregoing,  the Excluded Assets shall include (A) all  consideration
     received or to be received by Motient Services and/or any of its Affiliates
     pursuant to the Aether Sale Agreement,  the Escrow Agreement dated November
     29, 2000 between  Motient  Services and Aether,  and (B) the Eight  Million
     Eight  Hundred  Thousand  Dollars   ($8,800,000)  in  prepayments  (whether
     received or to be received) to Motient Services  pursuant to Section 2.1(c)
     of the Private Network Satellite Services Agreement dated November 29, 2000
     between  Motient  Services  and  Aether  (the  "Aether   Satellite  Network
     Agreement")."

     (k) Section  2.4(b) is hereby deleted in its entirety and replaced with the
following:

          "Notwithstanding  anything else in this Amended Sale  Agreement to the
     contrary, if an assignment or transfer of any Subject Asset or part thereof
     or any rights or benefits  thereunder  or resulting  therefrom  without the
     consent of a third party thereto , would  constitute a breach  thereof,  or
     make Newco,  Motient  Services or their  respective  Affiliates  liable for
     damages or other penalties  thereunder and if such consent is not obtained,
     or if an  attempted  assignment  thereof  would  be  ineffective  or  would
     adversely  effect  the  rights  of Newco so that  Newco  would  not in fact
     receive all such rights,  Motient  Services (i) shall cooperate with Newco,
     at Newco's request,  in endeavoring to obtain such consent and (ii) if such
     consent is unobtainable,  shall hold any such Subject Asset or part thereof
     in trust  for  Newco  and  shall  cooperate  with  Newco in an  arrangement
     designed to provide to Newco the benefits and  liabilities  associated with
     such  Subject  Asset  or part  thereof  or any  right  or  benefit  arising
     thereunder  or  resulting  therefrom,   including,   but  not  limited  to,
     enforcement  for the  benefit  of Newco of any and all  rights  of  Motient
     Services against any third party arising out of a breach or cancellation by
     such third party or  otherwise;  provided,  however,  that  nothing in this
     Section  2.4(b) shall be deemed a waiver by Newco or a requirement by Newco
     to waive  any  condition  to  Closing,  including  conditions  relating  to
     obtaining consents of third parties.  Motient Services and Newco shall from
     time to time after the Closing  Date  execute and deliver to the other such
     further  instruments  and other written  assurances and documents as may be
     reasonably  required to perfect the transfer of any Subject Asset to Newco,
     or to ensure that Newco in entitled to the benefits of any Subject Asset."

     (l) The  penultimate  sentence of Section  2.5(a) is hereby  deleted in its
entirety and replaced with the following:

          "Notwithstanding  anything contained in this Amended Sale Agreement to
     the  contrary,  the  Assumed  Liabilities  shall  include  (A) all  ongoing
     service,  warranty,  and  other  obligations  and  liabilities  of  Motient
     Services  to  Aether  under  the  Aether   Satellite   Network   Agreement,
     notwithstanding  the fact that the Eight  Million  Eight  Hundred  Thousand
     Dollars  ($8,800,000)  to be prepaid by Aether in  accordance  with Section
     2.1(c) of such agreement shall be retained by Motient Services, as provided
     in Section 2.4(a) above,  and (B) all of the obligations and liabilities of
     Motient  Services under the Intellectual  Property License  Agreement dated
     November  29, 2000  between  Motient  Services  and Aether (the  "Aether IP
     License"),  but only to the extent such obligations and liabilities  relate
     to the Intellectual Property that is being transferred to Newco pursuant to
     this Amended Sale Agreement."

     (m) The  following  clauses  (xiv)  and  (xv)  shall be added to the end of
Section 2.5(b):

          "(xiv) any  liability  relating to the matter  described  in Item 5 of
     Section  4.9 of the  Parent/Newco  Disclosure  Schedule  (as defined in the
     Investment Agreement), and (xv) any liability or obligation relating to the
     Agreement  of Lease dated  April 16,  1998  between  Motient  Services  and
     Council Square, LLC, and related Assignment dated June 6, 2000. "

     (n) Section  3.8(a)(iv) is hereby deleted in its entirety and replaced with
the following:

          "(iv) as long as Newco has  satellite  capacity,  and  Motient has not
     received the $8.8 million  prepayment in accordance  with Section 2.1(c) of
     the Aether Satellite  Network Agreement (or would be liable for return of a
     portion  thereof),  not  terminate  service to Aether under such  agreement
     without Motient Service's consent,"

     (o) Section 4.3 is hereby  revised to move the phrase  "Except as disclosed
on Schedule 4.3 of the Disclosure Schedule" immediately after (B) and before the
word "conflict".

     (p) Section 4.5 is hereby  revised to delete the words "owned by it" in the
first sentence.

     (q) Section 6.4 is hereby  deleted in its entirety  and  replaced  with the
following:

          "6.4 Contemporaneous Closing

          The  closing  of the  transactions  contemplated  by each of the First
     Closing  (as  defined  in  the  Investment  Agreement)  of  the  Investment
     Agreement,  the Asset Sale Agreement  dated as January 8, 2001, as amended,
     between  Newco  and TMI  Communications  and  Company  Limited  Partnership
     ("TMI") (the "Newco-TMI Sale Agreement"), the Asset Sale Agreement dated as
     January 8, 2001,  as  amended,  between TMI and  Canadian  License Co. (the
     "Canadian  Asset Sale  Agreement") and the Asset Sale Agreement dated as of
     January 8,  2001,  as  amended,  between  TMI and MSV Nova  Scotia ULC (the
     "TMI-ULC  Asset Sale  Agreement")  shall occur prior to, or  simultaneously
     with, the Closing under this Agreement."

     (r) Section 8.6 is hereby  revised to add at the end of the first  sentence
(immediately after the words "business opportunities") the following:

          "or if Newco determine in good faith that such  arrangement  would not
     be in the best  interest  of  Newco,  due to  Motient  Services'  financial
     conditions"

     (s) The  heading of Section 8.5 and  Section  8.5(a) are hereby  deleted in
their entirety and replaced with the following:

          "8.5 Leased Assets; Parent Guaranties

          (a) The parties  acknowledge that as of the date hereof (and as of the
     Closing  Date) the Leased  Assets,  which are listed on Schedule 8.5 to the
     Disclosure  Schedule,  that will comprise part of the Subject  Assets,  are
     presently  used by  Motient  Services  in  connection  with  its  Satellite
     Communications  Business and Motient  Corporation  and its  Subsidiaries in
     connection with their  respective  lines of business.  The parties agree to
     cooperate in good faith to develop a lease-back  arrangement  whereby Newco
     shall lease or otherwise provide reasonable access to such Leased Assets to
     Motient Corporation and its Subsidiaries. Such lease-back arrangement shall
     accommodate  the reasonable  business needs of both Newco, on the one hand,
     and Motient Corporation and its Subsidiaries,  on the other hand, and shall
     last for a period of time  reasonably  acceptable to both parties.  Without
     limiting the  generality of the  foregoing,  beginning on the Closing Date,
     Newco shall provide Motient  Corporation and its  Subsidiaries  with access
     to, and use of (A) the telephones,  facsimile machines and computers at the
     Reston  Facility then used by the employees of Motient  Corporation and its
     Subsidiaries (who are not Accepting Employees) for their intended and usual
     purpose in connection with the operation of the their respective businesses
     for a period of time  reasonably  acceptable  to both  parties  and (B) the
     computer  network and programs  for  accounting  applications.  The parties
     shall  negotiate  in good  faith  to  equitably  apportion  the  costs  and
     liabilities  associated  with  the  use of  such  Leased  Assets,  and,  if
     appropriate, enter into a transition services agreement which shall provide
     for the foregoing and such other  transition  services as the parties shall
     in good faith agree."

     (t) Schedule 2.3(v) and Schedule 8.5 to the Asset Sale Agreement are hereby
deleted in its entirety.

     (u)  Schedule  2.3(x)  attached  hereto is hereby  added as a new  Schedule
2.3(x) to the Asset Sale Agreement.

     2.  Miscellaneous.  Capitalized  terms used herein and not  defined  herein
shall have the meaning  ascribed to them in the Sale Agreement.  All other terms
and provisions of the Sale Agreement shall continue in full force and effect and
unchanged  and are  hereby  confirmed  in all  respects.  This  Amendment  shall
terminate upon the  termination of the October  Investment  Agreement and all of
the terms of the Sale Agreement shall continue in full force and effect (without
giving effect to this  Amendment).  This Amendment may be executed in any number
of  counterparts  which,  taken  together,  shall  constitute a single,  binding
instrument.

             [The remainder of this page intentionally left blank.]

<PAGE>

     IN WITNESS  WHEREOF,  each of the  parties  hereto  have  caused this First
Amendment to Amended and Restated  Asset Sale Agreement to be executed as of the
date first written above.

                                          MOBILE SATELLITE VENTURES LLC

                                          By: /s/Gary M. Parsons
                                             -----------------------------------
                                             Gary M. Parsons, Chairman

                                          MOTIENT SERVICES INC.

                                          By: /s/Gary M. Parsons
                                             -----------------------------------
                                             Gary M. Parsons, Chairman

<PAGE>

                                                                 Schedule 2.3(x)

                                  LEASED ASSETS

The Leased Assets include the (i)  telephones,  facsimile  machines,  computers,
printers,  and  other  office  and  communications  equipment  used by both  the
employees of the Satellite  Communications Business and the employees of Motient
Corporation or its subsidiaries,  (ii) office and common space furniture used by
both the employees of the Satellite Communications Business and the employees of
Motient  Corporation  or its  subsidiaries,  (iii) that portion of the telephone
(PSTN)  contracts  with  AT&T  and  Sprint  attributable  to  usage  by  Motient
Corporation  and its  subsidiaries  (other  than  the  Satellite  Communications
Business),  and (iv) assets and  facilities  necessary to provide  uninterrupted
power supply (UPS).EXHIBIT 10.50a

                              AMENDED AND RESTATED
                               DOCUMENT STANDSTILL
                            AND TERMINATION AGREEMENT

     This Amended and Restated  Document  Standstill and  Termination  Agreement
(this  "Agreement")  is made  as of  October  12,  2001  by and  among  Motient
Corporation  ("Motient"),   Motient  Services  Inc.  ("Sub"),  Mobile  Satellite
Ventures LLC (formerly known as Motient  Satellite  Ventures  LLC)("Newco")  and
each of the  Investors  (the  "Investors")  listed  on  Schedule  I of the  June
Investment Agreement (as defined below).

     WHEREAS,  Motient,  Newco  and the  Investors  entered  into an  Investment
Agreement,  dated June 22,  2000 (the "June  Investment  Agreement";  which term
shall also be deemed to include the Parent Transfer Letter Agreement (as defined
in the June Investment  Agreement) and the Section 2.1 Letter (as defined in the
June Investment  Agreement)) whereby the Investors invested in Newco and Motient
and the Investors  entered into a First Amended and Restated  Limited  Liability
Company Agreement of Newco dated June 29, 2000 (the "LLC Agreement");

     WHEREAS,  the  parties  hereto  entered  into the January  2001  Investment
Agreement  dated as of January 8, 2001 (the "January  Investment  Agreement") by
and among Motient, TMI Communications and Company,  Limited Partnership ("TMI"),
Newco,  the Investors and the other parties named therein to provide for,  among
other things, the addition of TMI as a limited partner of Newco;

     WHEREAS, in connection with the January Investment  Agreement,  the parties
hereto entered into a Document Standstill and Termination  Agreement dated as of
January 8, 2001 (the "First Document Standstill and Termination Agreement");

     WHEREAS, the parties hereto entered into an Amended and Restated Investment
Agreement,  dated as of the date hereof (the "October Investment  Agreement") by
and among Motient, TMI, Newco, the Investors and the other parties named therein
which amends and restates the January  Investment  Agreement  and provides  for,
among other  things,  the addition of TMI as a limited  partner of Newco and the
sale of the Convertible Notes (as defined in the October Investment Agreement);

     WHEREAS, the parties hereto desire for the terms of this Agreement to amend
and  restate  the  terms  of  the  First  Document  Standstill  and  Termination
Agreement;  provided,  however,  that if the  October  Investment  Agreement  is
terminated,  the parties hereto desire that this Agreement terminate and further
desire  to  continue  thereafter  with the  terms  and  conditions  of the First
Document  Standstill and  Termination  Agreement as if this Agreement were never
executed; and

     WHEREAS,  any capitalized term used but not otherwise  defined herein shall
have the meaning ascribed to such term in the October Investment Agreement.

     NOW  THEREFORE,  for good and valuable  consideration,  the  sufficiency of
which is hereby acknowledged, the parties hereto hereby agree as follows:

1. The  parties  hereby  consent to the  execution  and  delivery of the October
Investment  Agreement which amends and restates the January Investment Agreement
and provides for, among other things,  the addition of TMI as a limited  partner
of Newco and the sale of the Convertible Notes at the First Closing thereunder.

2. Subject to Section 3 below,  this  Agreement  hereby  amends and restates the
First Document Standstill and Termination Agreement in its entirety.

3. This Agreement shall terminate upon the termination of the October Investment
Agreement, and all of the terms of the First Document Standstill and Termination
Agreement shall continue in full force and effect (without giving effect to this
Agreement) as if this Agreement were never executed.

4. Subject to and effective upon the occurrence of the consummation of the First
Closing under the October Investment Agreement (a) the June Investment Agreement
shall be deemed terminated, and upon such termination all rights and obligations
of the parties thereunder,  other than the rights and obligations under Sections
7.9, 12, 17 and 18,  shall  terminate  and (b) the Newco LP  Agreement  shall be
deemed to supersede the LLC Agreement.

5. Until the  occurrence  of the  earlier of (a) the  consummation  of the First
Closing under the October  Investment  Agreement and (b) the  termination of the
October  Investment  Agreement,  the  parties  shall not  exercise  any of their
respective rights under the June Investment  Agreement (other than those arising
in connection  with a breach of the June  Investment  Agreement by another party
thereto arising prior to the date of this Agreement).

6. Whenever an agreement is said to be  terminated  or amended  pursuant to this
Agreement, this Agreement shall constitute the written consent of the parties to
such agreement to such termination or amendment.

7. This  Agreement is being  executed and delivered in, and shall be governed by
and construed according to the laws of, the State of New York (but not including
any choice of law rules  thereof  which would lead to a contrary  result).  This
Agreement shall be binding upon, and inure to the benefit of, the parties hereto
and their  respective  successors and permitted  assigns.  This Agreement may be
assigned  by a party  hereto  only to a person or  entity to whom such  party is
concurrently  assigning  its rights  under the October  Investment  Agreement in
accordance with the terms of the October  Investment  Agreement.  This Agreement
may be executed in any number of counterparts,  each of which shall be deemed an
original  and   enforceable   against  the  parties   actually   executing  such
counterpart,  and all of  which,  when  taken  together,  shall  constitute  one
instrument.

                         [Signatures on Following Pages]

<PAGE>

     IN WITNESS WHEREOF,  the undersigned  indicate their agreement to the above
as of the day and year first above written.

                               MOTIENT CORPORATION

                               By: /s/Gary M. Parsons
                                  ----------------------------------------------
                                  Gary M. Parsons, Chairman

                               MOTIENT SERVICES INC.

                               By: /s/Gary M. Parsons
                                  ----------------------------------------------
                                  Gary M. Parsons, Chairman

                               MOBILE SATELLITE VENTURES LLC

                               By: /s/Gary M. Parsons
                                  ----------------------------------------------
                                  Gary M. Parsons, Chairman

                               TELCOM SATELLITE VENTURES INC.

                               By: /s/Rahul Prakash
                                  ----------------------------------------------
                                  Rahul Prakash, President

                               COLUMBIA SPACE (QP), INC.

                               By: /s/James B. Fleming, Jr.
                                  ----------------------------------------------
                                  James B. Fleming, Jr.
                                  Title: President

<PAGE>

                               COLUMBIA SPACE (AI), INC.

                               By: /s/James B. Fleming, Jr.
                                  ----------------------------------------------
                                  James B. Fleming, Jr.
                                  Title: President

                               COLUMBIA SPACE PARTNERS, INC.

                               By: /s/James B. Fleming, Jr.
                                  ----------------------------------------------
                                  James B. Fleming, Jr.
                                  Title: President

                               SPECTRUM SPACE EQUITY
                               INVESTORS IV, INC.

                               By: /s/Kevin J. Maroni
                                  ----------------------------------------------
                                  Kevin J. Maroni
                                  Title:  Chairman and CEO

                               SPECTRUM SPACE IV PARALLEL, INC.

                               By: /s/Kevin J. Maroni
                                  ----------------------------------------------
                                  Kevin J. Maroni
                                  Title:  Chairman and CEO

                               SPECTRUM SPACE IV MANAGERS, INC.

                               By: /s/Kevin J. Maroni
                                  ----------------------------------------------
                                  Kevin J. Maroni
                                  Title:  Chairman and CEO

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