XM HIRES SEASONED EXECUTIVES TO HEAD UP MARKETING STRATEGY & CREATIVE SERVICES; PROMOTES LEADER OF SATELLITE SEGMENT

National, April 04, 2000 -- XM Satellite Radio Inc. (NASDAQ:XMSR) today announced the appointment of two new vice presidents to its Sales and Marketing department and the promotion of a key executive in its Engineering and Operations unit. Patricia Kesling, Vice President, Marketing Strategy and Gary Hahn, Vice President, Advertising and Creative Services are the newest members of XM's Sales and Marketing department. Derek de Bastos, previously Director of XM's Space Segment, was promoted to Vice President of XM's Space Segment. These executives bring extensive experience and knowledge in their respective fields: wireless consumer services, entertainment marketing and satellite engineering. All three are based in XM's Washington, DC, headquarters.
As Vice President of Marketing Strategy, Ms. Kesling is responsible for negotiating relationships with content providers and other strategic partners and for shaping XM's bandwidth utilization strategy. She joins XM following more than 10 years with GTE Corporation, most recently as Director of Marketing for GTE Wireless. In that capacity, she headed a highly successful national marketing team that developed and implemented programs and practices that significantly increased customer loyalty and reduced customer attrition for a business supporting over five million customers. From February 1995 to March 1997, she was a General Manager at GTE Wireless, where she directed sales and service for five markets with 1.7 million combined population and a workforce of 157 employees.

Previously at GTE, Ms. Kesling was Manager of Budgets and Results and a Customer Accounting Manager. She joined GTE as Senior Auditor in October 1989. Prior to GTE, she was a senior auditor at Deloitte & Touche, CPA.

Mr. Hahn brings more than 14 years experience in entertainment marketing and promotion to his post as Vice President of Advertising and Creative Services, where he is responsible for XM's overall brand image, look and feel across all media. He joined XM from Primestar by DIRECTV/Primestar, where he was Director of On-Air Promotion from July 1998 to January 2000. Mr. Hahn has won numerous design awards including the 1999 Promax Golden Medallion.

Mr. Hahn was Vice President of On-Air Promotion for Request Television from September 1995 to June 1998. Prior to that, he was Director of Advertising, Publicity and Promotion for Warner Bros.' Domestic Pay-TV, Cable and Network Features Division; Account Executive at Rosenfeld, Sirowitz, Humphrey & Strauss for the Delta/Peerless/Epic Faucet Company and Chase Home Mortgage accounts; and, Account Executive at Doyle Dane Bernbach/West for the Volkswagen and Audi accounts.

In his role as Vice President, Space Segment, Mr. de Bastos is responsible for the design, development, launch and in-orbit delivery of XM's satellite system. He also manages the development of XM's ground-based satellite infrastructure and uplink delivery system. An engineering graduate of Lehigh University, Mr. de Bastos has more than 14 years of experience developing space-based, wireless communication systems.

Before joining XM, Mr. de Bastos was Director of DARS Satellite Programs for WorldSpace where he led the design and development of the high-power satellite architecture that evolved into the system now being built for XM. Mr. de Bastos began his career at RCA Astro Space in East Windsor, NJ (subsequently acquired by Lockheed Martin). During his 12-year tenure there, he held management positions on several major satellite programs, most notably Payload Program Manager of the NHK-DBS spacecraft series where he pioneered the design for broadband high-power satellite applications.

About XM Satellite Radio
The XM sound will combine leading brand-name channels with distinctive formats produced in XM Radio's fully digital state-of-the-art studios by some of the country's leading artists, producers and radio format designers. XM-Ready radios will be manufactured by such household names as Sony, Alpine, Pioneer Electronics Corporation, Delphi Delco Electronic Systems, Audiovox, Clarion, Mitsubishi Electronic Automotive America, Motorola and the Sharp Corporation. The service will be easy to order, with XM-Ready radios available at car dealerships and consumer electronics stores across the country. The company has a 12-year distribution agreement with General Motors to integrate XM-Ready radios into its vehicles commencing in 2001. American Mobile Satellite Corporation (NASDAQ:SKYC) holds a controlling interest in the company, which is also backed General Motors, Clear Channel Communications and DIRECTV, respectively, the leading car, radio and satellite TV companies in the US.

First there was AM, then FM and soon ... XM Satellite Radio. For more information, please visit XM's new website: www.xmradio.com.

Factors that could cause actual results to differ materially from those in the forward-looking statements in this press release include uncertainties associated with the launch of our satellites, the company's dependence on third party vendors, its continuing need for additional financing, as well as other risks described in XM Satellite Radio Inc.'s Form 8-K filed with the Securities and Exchange Commission. Copies of the filing are available upon request from XM Radio' s Investor Relations Department.