The US space shuttle Endeavour, mounted atop NASA’s modified Boeing 747, flies near the Griffith Park Observatory in Los Angeles on its final flight, September 21, 2012. The retired space shuttle is spending it’s last day in the air on a 5-hour flyover before landing at the Los Angeles International Airport, where it will stay for a few weeks before taking a slow-speed land journey across town through neighborhoods to its final museum home, the California Space Center.AFP PHOTO/JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/GettyImages)