The U.S. Space Shuttle program started with the awarding of the contract to Rockwell International's Space Transportation Systems Division. There were 6 shuttles built, Enterprise OV-101 (Orbital Vehicle) for testing, Columbia OV-102, Challenger OV-099, Discovery OV-103, Atlantis OV-104 and Endeavour OV-105. The first of 135 Space Shuttle missions took place April 12, 1981 and lasted 2 days 6 hours when STS-1 (Space Transportation System) was launched using Space Shuttle Columbia. Of the 135 mission launches there were 2 tragedies when Columbia and Challenger plus their crews were lost.
Space Shuttle “Endeavour” Orbiter Vehicle Designation OV-105 was scheduled for its first mission on May 4, 1992 but was delayed until May 7, 1992. The crew deployed 4 satellites and saved an unusable previously launched satellite. To accomplish the repositioning a first time ever 3 crew member EVA attached a live rocket motor to reposition the satellite in the correct geosynchronous. Endeavour’s last mission took place from May 16, 2011 to June 1, 2011. Endeavour’s life span saw 25 missions, 173 crew, 4,671 orbits and 122,883,151 miles traveled.