<Tr> <Th> Last launch </Th> <Td> Space Shuttle Atlantis STS - 135 July 8, 2011 </Td> </Tr> <P> The Space Shuttle orbiter was the reusable spaceplane component of the Space Shuttle program . Operated by NASA, the U.S. space agency, this vehicle could carry astronauts and payloads into low Earth orbit, perform in - space operations, then re-enter the atmosphere and land as a glider, returning its crew and any on - board payload to the Earth . </P> <P> Six orbiters were built for flight: Enterprise, Columbia, Challenger, Discovery, Atlantis, and Endeavour . All were built in Palmdale, California, by the Pittsburgh, Pennsylvania - based Rockwell International company . The first orbiter, Enterprise, made its maiden flight in 1977 . An unpowered glider, it was carried by a modified Boeing 747 airliner called the Shuttle Carrier Aircraft and released for a series of atmospheric test flights and landings . Enterprise was partially disassembled and retired after completion of critical testing . The remaining orbiters were fully operational spacecraft, and were launched vertically as part of the Space Shuttle stack . </P> <P> Columbia was the first space - worthy orbiter, and made its inaugural flight in 1981 . Challenger, Discovery, and Atlantis followed in 1983, 1984 and 1985 respectively . In 1986, Challenger was destroyed in an accident shortly after launch . Endeavour was built as Challenger's replacement, and was first launched in 1992 . In 2003, Columbia was destroyed during re-entry, leaving just three remaining orbiters . Discovery completed its final flight on March 9, 2011, and Endeavour completed its final flight on June 1, 2011 . Atlantis completed the last ever Shuttle flight, STS - 135, on July 21, 2011 . </P>

What are the names of the us space shuttles
find me the text answering this question