The first partially reusable orbital spacecraft, a winged non-capsule, the Space Shuttle, was launched by the USA on the 20th anniversary of Yuri Gagarin's flight, on April 12, 1981. During the Shuttle era, six orbiters were built, all of which have flown in the atmosphere and five of which have flown in space. "Enterprise" was used only for approach and landing tests, launching from the back of a Boeing 747 SCA and gliding to deadstick landings at Edwards AFB, California. The first Space Shuttle to fly into space was "Columbia", followed by "Challenger", "Discovery", "Atlantis", and "Endeavour". "Endeavour" was built to replace "Challenger" when it was lost in January 1986. "Columbia" broke up during reentry in February 2003.