Joint Filing Agreement
Exhibit 99.11
In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as
amended, the undersigned hereby agree to the joint filing by the undersigned on behalf of each of
them of a statement on Schedule 13D (including amendments thereto) with respect to the Common
Stock, par value $0.01 per share, of TerreStar Corporation., a Delaware corporation, and that this
agreement may be included as an exhibit to such joint filing.
IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as of June 19, 2008.
| XXXXXXX X. XXXXX |
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| By: | /s/ Xxxxxxx X. Xxxxx | |||
| Name: | Xxxxxxx X. Xxxxx | |||
| ECHOSTAR CORPORATION |
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| By: | /s/ Xxxxxxx X. Xxxxx | |||
| Name: | Xxxxxxx X. Xxxxx | |||
| Title: | Chairman and Chief Executive Officer | |||
