Exhibit 99.1

                           [TERRESTAR NETWORKS LOGO]

          TerreStar Canada Files Industry Canada Application to Modify
                          Satellite In-Orbit Milestone

Reston, VA, June 14, 2007 - TerreStar Networks Inc. (TerreStar), a majority
owned subsidiary of Motient Corporation (MNCP), today announced that its
Canadian partner, TerreStar Canada, filed a request on June 10, 2007 with
Industry Canada to extend its last remaining milestone date for the TerreStar-1
satellite. TerreStar Canada is seeking the extension to accommodate manufacture
and delivery issues experienced by satellite manufacturer, Space Systems/Loral,
Inc. as more fully described in the press release issued by TerreStar Networks
on May 25, 2007. TerreStar Canada's request for an extension tracks the request
filed by TerreStar with the FCC on Friday, June 8.

TerreStar expects to meet its in-service milestone of November 2008 and with
TerreStar Canada bring online North America's first 4G integrated mobile
satellite and terrestrial communications network.

About TerreStar Networks (Canada) Inc.

TerreStar Canada is a Canadian company owned by TMI Communications and Company,
Limited Partnership and TerreStar Networks Inc. TerreStar Canada is developing
the first 4G integrated mobile satellite and terrestrial communications network
in Canada that will offer integrated mobile voice, video and data
communications.

About TerreStar Networks Inc.

TerreStar (www.terrestar.com), a subsidiary of Motient Corporation, plans to
build, own and operate North America's first 4G integrated mobile satellite and
terrestrial communications network that will provide universal access and
tailored applications throughout North America over conventional wireless
devices. TerreStar expects to be the first to offer customer-designed products
and applications over a fully optimized 4G IP network.

About Motient Corporation

Motient is the controlling shareholder of TerreStar Networks Inc. and TerreStar
Global Ltd., and a shareholder of SkyTerra Communications and Mobile Satellite
Ventures LP. For additional information on Motient, please visit the company's
website at www.motient.com.

Statement under the Private Securities Litigation Reform Act

This press release may contain forward-looking statements within the meaning of
the Private Securities Litigation Reform Act, with respect to the strategy of
Motient, its plans, and the transactions described in this press release. Such
statements generally include words such as could, can, anticipate, believe,
expect, seek, pursue, proposed, potential and similar words and terms in
connection with future results. Motient assumes no obligation to update or
supplement such forward-looking statements.

For more information:

TerreStar Media Relations
-------------------------
Andrew Krejci
TerreStar Networks Inc.
703.483.7856
andrew.krejci@terrestar.com
---------------------------