EXHIBIT 32.1

           CERTIFICATION PURSUANT TO 8 U.S.C. SECTION 1350, AS ADOPTED
            PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


     In connection with the quarterly report of Motient Corporation, a Delaware
corporation (the "Company"), on Form 10-Q for the period ending June 30, 2005,
as filed with the Securities and Exchange Commission on the date hereof (the
"Report"), I, Christopher W. Downie, Executive Vice President, Chief Operating
Officer and Treasurer of the Company, certify, in my capacity as principal
executive officer, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge and based
on my review of the Report:

           1.         the Report fully complies with the requirements of Section
13(a) or 15(d) of the Securities Exchange Act of 1934; and

           2.         the information contained in the Report fairly presents,
in all material respects, the financial condition and result of operations of
the Company.


                                     /s/ Christopher W. Downie
                                     -------------------------
                                     Executive Vice President, Chief Operating
                                     Officer and Treasurer (principal executive
                                     officer)


                                     November 2, 2005