MSV Appoints Alexander Good as CEO and Vice Chairman to Lead the Company's Next-Generation Activities.

Business Editors/High-Tech Writers

LINCOLNSHIRE, Ill. & RESTON, Va.--(BUSINESS WIRE)--May 24, 2004

Mobile Satellite Ventures (MSV), a limited partnership in which Motient Corporation owns a 29.5% interest, fully diluted, announced on May 14, 2004, the appointment of Alexander H. Good as its new vice chairman and chief executive officer (CEO), effective immediately. Gary Parsons, formerly MSV's chairman and CEO, will continue on as chairman.

Good, a wireless and telecom veteran, will spearhead MSV's efforts to build and operate the company's next-generation business that will combine the best of satellite and terrestrial networks. MSV's next-generation hybrid wireless network incorporates powerful geostationary satellites with an ancillary terrestrial component (ATC) to deliver service to standard wireless terminals.

Mr. Good has a long history in the telecommunications field as an operating executive and on the Boards of telecom businesses. From 1997 to 1999, Good was executive vice president of Bell Atlantic Corp (now Verizon) and served as a member of that company's Executive Committee. From 1994 to 1996, he served as CEO and President of Bell Atlantic International, where he lead the company's high growth international operations. He also initiated and oversaw the company's investments in other areas, including the satellite industry. Prior to his service with Bell Atlantic, he served as chairman and CEO of the Board for Mtel International.

"MSV is moving ahead with its plans to develop our next-generation business, and Alex is a strong addition to our executive team at this critical time in MSV's history," said Parsons. "His credentials in the telecommunications and wireless industries and in public policy make him the perfect choice to lead MSV into the future, and to articulate our vision to customers, partners and the regulatory community."

"I have always been focused on building high-growth businesses and that's why I am excited about leading Mobile Satellite Ventures at this time," said Good. "We are moving ahead to develop a standalone business that will redefine the wireless industry and deliver on the promise to provide wireless, everywhere."

In addition to his industry experience, Good also served in international commerce under the Reagan Administration. In 1985, he was appointed Assistant Secretary of Commerce and Director General of the U.S. Foreign Commercial Service, where he directed 1,300 personnel and an $80 million international trade network in 200 locations worldwide.

About Motient Communications

Motient Corporation owns and operates the nation's largest two-way wireless data network. Motient provides a wide range of mobile and wireless Internet services principally to business to business customers and enterprises. The company is a leader in providing BlackBerry(TM) services on its network as well as on the third generation networks of Verizon Wireless and T-Mobile. Motient also provides wireless solutions to the mobile professional, transportation, field service and telemetry markets. http://www.motient.com.

About MSV

Mobile Satellite Ventures is North America's premier provider of mobile satellite communications services. Delivering service since 1996, MSV offers customers a wide choice of wireless data, voice, fax and dispatch radio services via its two MSAT satellites. MSV provides superior capacity and reliability for customers across North America, northern South America, Central America, the Caribbean, Hawaii and in coastal waters.

MSV is dedicated to developing the next generation hybrid wireless network over North America that will utilize a powerful satellite constellation working in unison with MSV's patented ancillary terrestrial component (ATC) technology to deliver seamless wireless services to end-users over standard wireless devices.

MSV is headquartered in Reston VA with an office in Ottawa ON. For more information, visit MSV online at www.msvlp.com.

This release contains forward looking statements, including statements regarding Motient's continuing operations and business, and Motient's future financial performance. Factors that could cause actual results to differ materially from those in the forward looking statements in this news release are described in Motient Corporation's annual report on Form 10-K for the year ended December 31, 2002 (filed on March 22, 2004) and in Motient's other periodic filings and reports with the Securities and Exchange Commission. Copies of such reports and filings are available upon request from Motient's Investor Relations Department.