In this photo provided by NASA, space shuttle Endeavour and its modified 747 carrier aircraft soar over the Hollywood sign in Los Angeles during its tour of California, Friday, Sept. 21, 2012. (AP Photo/NASA, Jim Ross)

Associated Press
In this photo provided by NASA, space shuttle Endeavour and its modified 747 carrier aircraft soar over the Hollywood sign in Los Angeles during its tour of California, Friday, Sept. 21, 2012. (AP Photo/NASA, Jim Ross)
In this photo provided by NASA, space shuttle Endeavour and its modified 747 carrier aircraft soar over the Hollywood sign in Los Angeles during its tour of California, Friday, Sept. 21, 2012. (AP Photo/NASA, Jim Ross)
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