The Space Shuttle Atlantis announced its arrival at the Kennedy Space Center (KSC) in the early morning hours of 21 July 2011 with a double sonic boom. Just over three minutes later, the spaceship touched down on the runway and at 05:57:54 local time "wheels stop" was called for the last time. Atlantis and its crew had safely returned to Earth. NASA's space shuttles have travelled into orbit 135 times; this era ended today. The space shuttles have shaped US space policy for the last 30 years and have stood as an icon of human spaceflight for a whole generation.