The Space Shuttle Enterprise never flew in space. It was the first Space Shuttle built (completed on September 17, 1976), and was used only for aeronautical flight testing. The Enterprise arrived at Dryden in January 1977 for a flight program involving a Boeing 747 airliner that had been modified for use as a shuttle carrier aircraft (SCA).
NEWS (Video) Shuttle Enterprise Separates from 747 In-Flight – 1977
