The Space Shuttle was a partially reusable spaceflight vehicle capable of reaching low Earth orbit, commissioned and operated by NASA from 1981 to 2011. The first orbiter, Enterprise, was built in 1976, used in Approach and Landing Tests and had no orbital capability. Four fully operational orbiters were initially built: Columbia, Challenger, Discovery, and Atlantis..
Columbia’s Second Flight. Postal cover, November 12, 1981, signed by Joe Engle and Richard Truly.