A version of this article appears in the August 11/18 double issue of Aviation Week & Space Technology. Almost five years after beginning its search for a U.S.-developed spacecraft to carry humans into orbit, NASA is poised to award at least one contract to its industry partners in the Commercial Crew Program. The three contenders—Boeing, Space Exploration Technologies (SpaceX) and Sierra Nevada Corp.—could hear as soon as the end of August which of their proposed vehicles ...

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