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Cancelled NASA spacecraft

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Lockheed Martin X-33
uncrewed re-usable spaceplane technology demonstrator for the VentureStar
NASA X-38
airplane
Space Station Freedom
proposed American space station, predecessor to the International Space Station
Altair
planned lunar lander component of NASA's cancelled Project Constellation
Rockwell X-30
airplane
Skylab B
proposed second US space station similar to Skylab
Crew Return Vehicle
proposed dedicated lifeboat or escape module for the International Space Station