The Space Shuttle -

: A prototype used for atmospheric flight tests; it never flew in space but is currently on display at the Intrepid Sea, Air & Space Museum. How It Worked

: Flew the final mission of the program (STS-135) in July 2011. The Space Shuttle

Five flight-worthy orbiters were constructed for the program: : A prototype used for atmospheric flight tests;

40 Years Ago: Space Shuttle Enterprise rolls to the Pad - NASA it flew 39 missions

: The "workhorse" of the fleet, it flew 39 missions, including the launch of the Hubble Space Telescope.