Stock Photo - A Shuttle Training Aircraft (STA) piloted by NASA astronaut Chris Ferguson, STS-135 commander, is seen against the late afternoon sun as the crew of the final space shuttle mission practices landings at NASA's Kennedy Space Center in Florida May 31, 2011. Photo credit: NASA PhotoHouston Chronicle, Smiley N. Pool

Stock Photo: A Shuttle Training Aircraft (STA) piloted by NASA astronaut Chris Ferguson, STS-135 commander, is seen against the late afternoon sun as the crew of the final.

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