EXHIBIT 31.2

                                  CERTIFICATION

         The undersigned, in her capacity as the Controller and Chief Accounting
Officer of Motient Corporation, being the principal financial officer, provides
the following certifications required by 18 U.S.C. Section 1350, as adopted
pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

         I, Myrna J. Newman, hereby certify that:

         1. I have reviewed this annual report on Form 10-K of Motient
Corporation, a Delaware corporation (the "Company");

         2. Based on my knowledge, this annual report does not contain any
untrue statement of a material fact or omit to state a material fact necessary
to make the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by this
report;

         3. Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
Company as of, and for, the periods presented in this report;

         4. The Company's other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) for the Company and have:

                  (a) Designed such disclosure controls and procedures, or
                  caused such disclosure controls and procedures to be designed
                  under my supervision, to ensure that material information
                  relating to the Company, including its consolidated
                  subsidiaries, is made known to me by others within those
                  entities, particularly during the period in which this report
                  is being prepared;

                  (b) Evaluated the effectiveness of the Company's disclosure
                  controls and procedures and presented in this report my
                  conclusions about the effectiveness of the disclosure controls
                  and procedures, as of the end of the period covered by this
                  report based on such evaluation; and

                  (c) Disclosed in this report any change in the Company's
                  internal control over financial reporting that occurred during
                  the Company's most recent fiscal quarter that has materially
                  affected, or is reasonably likely to materially affect, the
                  Company's internal control over financial reporting; and

         5. The Company's other certifying officer and I have disclosed, based
on my most recent evaluation of internal control over financial reporting, to
the Company's auditors and the audit committee of the Company's board of
directors (or persons performing the equivalent functions):

                  (a) All significant deficiencies and material weaknesses in
                  the design or operation of internal control over financial
                  reporting which are reasonably likely to adversely affect the
                  Company's ability to record, process, summarize and report
                  financial information; and

                  (b) Any fraud, whether or not material, that involves
                  management or other employees who have a significant role in
                  the Company's internal control over financial reporting.

                         /s/ Myrna J. Newman
                         -------------------
                         Myrna J. Newman

                         Controller and Chief Accounting Officer
                         (principal financial officer)

                         July 2, 2004