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>OV-098 Pathfinder
Test model made from steel and wood to help develop shuttle support logistics and facilities. No functionality.
>OV-099 Challenger
Orginally built as a ground model for development use, was later retrofitted for full flight and space capabilities. Exploded during a launch due to mismanagement within NASA.
>OV-101 Enterprise
Air flight test vehicle. Not able to operate in space. Named after the Star Trek ship.
>OV-102 Columbia
First shuttle built from the start with space capabilities. Had some unique physical and cosmetic features left over from shuttle program testing period. Disintegrated during reentry due to wing damage sustained during launch.
>OV-103 Discovery
Shuttle with longest use, and first intact space-capable shuttle to be retired.
>OV-104 Atlantis
Has the distinction of being the last space shuttle to be used.
>OV-105 Endeavour
Mostly built out of the Discovery's and Atlantis's spare parts, to replace Challenger.
