Space Shuttle Atlantis touches down on Runway 33 at NASA's Kennedy Space Center, concluding mission STS-115, Thursday, 21 September 2006. Aboard are Commander Brent Jett, Pilot Christopher Ferguson, and Mission Specialists Joseph Tanner, David Burbank, Heidemarie Stefanyshyn-Piper and Steven MacLean, who represents the Canadian Space Agency. During the mission, Tanner, McLean, Burbank and Piper completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. This is the 15th night landing at KSC and the 23rd night landing overall. photo: NASA