An American flag flaps proudly in the wind in front of space shuttle Atlantis on the Shuttle Landing Facility's Runway 15 at NASA's Kennedy Space Center in Florida. Atlantis' final return from space at 5:57 a.m. EDT completed the 13-day, 5.2-million-mile STS-135 mission. Securing the space shuttle fleet's place in history, Atlantis brought a close to the nation's Space Shuttle Program. STS-135 delivered spare parts, equipment and supplies to the International Space Station. STS-135 was the 33rd and final flight for Atlantis, which has spent 307 days in space, orbited Earth 4,848 times and traveled 125,935,769 miles.