EXHIBIT 1

JOINT FILING AGREEMENT

      In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them a Statement on Schedule 13D (including amendments thereto) with regard to the common stock of Motient Corporation, and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filings. In evidence thereof, the undersigned, being duly authorized, hereby execute this Agreement as of April 19, 2005.

HIGHLAND CAPITAL MANAGEMENT, L.P.
By:	Strand Advisors, Inc., its general partner
	By:	/s/ James Dondero
	Name:	James Dondero
	Title:	President
STRAND ADVISORS, INC.
By:	/s/ James Dondero
Name:	James Dondero
Title:	President
/s/ James Dondero
James Dondero
PROSPECT STREET HIGH INCOME PORTFOLIO, INC.
By:	/s/ James Dondero
Name:	James Dondero
Title:	President
PROSPECT STREET INCOME SHARES INC.
By:	/s/ James Dondero
Name:	James Dondero
Title:	President
HIGHLAND LEGACY, LIMITED
By:	Highland Capital Management, L.P., its collateral manager
By:	Strand Advisors, Inc., its general partner
	By:	/s/ James Dondero
	Name:	James Dondero
	Title:	President

HIGHLAND CRUSADER OFFSHORE PARTNERS, L.P.
By:	Highland Capital Management, L.P., its general partner
By:	Strand Advisors, Inc., its general partner
	By:	/s/ James Dondero
	Name:	James Dondero
	Title:	President
PAMCO CAYMAN, LIMITED
By:	Highland Capital Management, L.P., its collateral manager
By:	Strand Advisors, Inc., its general partner
	By:	/s/ James Dondero
	Name:	James Dondero
	Title:	President
HIGHLAND EQUITY FOCUS FUND, L.P.
By:	Highland Capital Management, L.P., its general partner
By:	Strand Advisors, Inc., its general partner
	By:	/s/ James Dondero
	Name:	James Dondero
	Title:	President
HIGHLAND SELECT EQUITY FUND, L.P.
By:	Highland Capital Management, L.P., its general partner
By:	Strand Advisors, Inc., its general partner
	By:	/s/ James Dondero
	Name:	James Dondero
	Title:	President
HIGHLAND CAPITAL MANAGEMENT SERVICES, INC.
By:	/s/ James Dondero
Name:	James Dondero
Title:	President