Boeing CST-100
Boeing has proposed developing a version of its CST-100 crew spacecraft to transport cargo to and from the International Space Station. (credit: Boeing illustration)

COLORADO SPRINGS, Colo. — Boeing expects to select a single vehicle next month from an unspecified number of rockets in the running to launch unmanned flight tests and early crewed missions of the seven-person CST-100 space taxi it is developing with financial backing from NASA.

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