The crew of STS-135 is seen as they depart the NASA Kennedy Space Center, Operations and Checkout Building and get into the Astrovan for launch pad 39A, on Friday, July 8, 2011 in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Jerry Ross)

Crowds are seen out the front window of the Astrovan carrying the STS-135 crew as it departs the NASA Kennedy Space Center, Operations and Checkout Building for launch pad 39A, on Friday, July 8, 2011 in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Jerry Ross)

NASA Chief, Astronaut Office, Johnson Space Center Peggy Whitson, center, STS-135 Astronauts, Rex Walheim, left, and Commander Chris Ferguson are seen as the entire crew plays a traditional card game at the NASA Kennedy Space Center Operations and Checkout Building prior to them leaving for the launch pad, on Friday, July 8, 2011 in Cape Canaveral, Fla. The point of the game is that the commander must use up all his or her bad luck before launch, so the crew can only leave for the pad after the commander loses. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Jerry Ross)

The STS-135 crew; Chris Ferguson, commander; Doug Hurley, pilot;, left, Rex Walheim and Sandy Magnus, both mission specialists are seen before boarding space shuttle Atlantis at launch pad 39A prior to launch, Friday, July 8, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Jerry Ross)

NASA Chief, Astronaut Office, Johnson Space Center Peggy Whitson deals cards during a traditional game that is played at the NASA Kennedy Space Center Operations and Checkout Building with the shuttle crew prior to them leaving for the launch pad, on Friday, July 8, 2011 in Cape Canaveral, Fla. The point of the game is that the commander must use up all his or her bad luck before launch, so the crew can only leave for the pad after the commander loses. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Jerry Ross)

James Branson of United Space Alliance, far left; Sandra Magnus, STS-135 mission specialist and Rex Walheim, STS-135 mission specialist, far right, are seen in the Astrovan as they ride to launch pad 39A to board space shuttle Atlantis on Friday, July 8, 2011, at the Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Jerry Ross)

Hiawatha Brown, Heavy Equipment Operator for United Space Alliance (USA), approaches launch pad 39A at the NASA Kennedy Space Center as he drives the Astrovan carrying the STS-135 crew on Friday July 8, 2011 in Cape Canaveral, Fla. The Astrovan is a modified 1983 Airstream and has been in use to carry crews to the launch pads since 1984. A close look at the odometer shows it has a little more than 26,521 miles at the time of this photo. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Jerry Ross)

The STS-135 mission specialist Rex Walheim, left, Doug Hurley, pilot; second from left, Sandy Magnus, mission specialist; and Chris Ferguson, commander, right, stop and take a moment to look up at the space shuttle Atlantis prior to boarding at launch pad 39A, Friday, July 8, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Jerry Ross)

The STS-135 crew, clockwise: Sandra Magnus, mission specialist; Rex Walheim, mission specialist; Chris Ferguson, commander and Doug Hurley, pilot are seen in the Astrovan as they ride to launch pad 39A to board space shuttle Atlantis on Friday, July 8, 2011, at the Kennedy Space Center in Cape Canaveral, Fla. The launch of Atlantis, STS-135, is the final flight of the shuttle program, a 12-day mission to the International Space Station. Photo Credit: (NASA/Jerry Ross)