STS-132 May 14th 2010 will be the last flight of Atlantis
STS-134 Sept 16th 2010 will be the last flight of Discovery and
the Shuttle program.
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STS-135 is the last space shuttle mission with Atlantis on June
28th 2011.
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NASA has two more shuttle flights planned: STS 134 and STS 135.
There have been 133 shuttle flights so far, including STS-133 which
concluded on March 09, 2011.