NASA Chief of the Astronaut Office Peggy Whitson, left, STS-135 mission Pilot Doug Hurley, second from left, NASA Administrator Charles Bolden, and Deputy Chief of Flight Crew Operations Directorate Brian Kelly, right, talk under the space shuttle Atlantis at the Kennedy Space Center Shuttle Landing Facility (SLF) shortly after Hurley and the rest of the STS-135 crew landed in Atlantis early Thursday morning, July 21, 2011, in Cape Canaveral, Fla. Overall, Atlantis spent 307 days in space and traveled nearly 126 million miles during its 33 flights. Atlantis, the fourth orbiter built, launched on its first mission on Oct. 3, 1985. Photo Credit: (NASA/Bill Ingalls)