If Starliner aces Crew Flight Test, NASA will have a second company to take its astronauts into Earth's atmosphere. NASA has already ordered six Starliner crew rotation missions to the space station. It can carry up to four astronauts, or a mix of passengers and cargo.
Currently only one spacecraft, the SpaceX Crew Dragon, launches astronauts from the United States. After the Space Shuttle Program ended in July 2011, spacefarers could only launch from Russia or China.
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