EXHIBIT I
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(f) under the Securities Exchange
Act of 1934, as amended, the persons named below agree to the joint filing on
behalf of each of them of a statement on Schedule 13D dated April 13, 1998 with
respect to the Common Stock, par value $.01 per share, of American Mobile
Satellite Corporation, a Delaware corporation. This Joint Filing Agreement shall
be included as an Exhibit to such joint filing. In evidence thereof each of the
undersigned, being duly authorized, hereby executes this Agreement this 13th day
of April 1998.
SINGAPORE TELECOMMUNICATIONS LTD.
By: /s/ Ho Siaw Hong
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Name: Ho Siaw Hong
Title: Assistant Vice President
(Satellite Services)
TEMASEK HOLDINGS (PRIVATE) LTD.
By: /s/ Ng Xxx Xxxx
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Name: Ng Xxx Xxxx
Title: Senior Vice President/
Company Secretary
