Not only does Enterprise contain an "s" but the USS Enterprise (the space craft) never went into space. The Enterprise first flew attached to a carrier aircraft in 1977, followed by 4 more unmanned test flights, then 3 manned. Finally 5 free flights were made before being attached to an external tank and boosters for vibration tests. It was then partially dismantled and parts used in the fleet. After Challenger it was considered as a replacement but the decision was made to use spare parts from Discovery and Atlantis to construct Endeavor.
Is this just TOO geeky
