The flame trench underneath the space shuttle Atlantis at pad 39a is seen on Thursday, July 7, 2011 at the NASA Kennedy Space Center in Cape Canaveral, Fla. Space shuttle Atlantis is set to liftoff Friday, July 8, on the final flight of the shuttle program, STS-135, a 12-day mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)