NASA launched the Space Shuttle Atlantis on STS-135, its final mission, and the final mission of the 30 year long shuttle program at 11:29 ET. The mission was delayed with an unexpected hold at T-31 seconds when an error indicated that the Gaseous Oxygen Vent Arm had not fully retracted. Visual examination showed the error was a computer glitch and the countdown continued. Originally, Atlantis was supposed to have flown its last mission in May, 2010, but the current mission was added on October 11, 2010. The first shuttle launch, of Columbia, occurred on April 12, 1981.
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