In this photo provided by NASA, the space shuttle Discovery is suspended from a sling held by two cranes after being flown on a the Boeing 747 carrier at Washington Dulles International Airport, Thursday, April 19, 2012, in Sterling, Va. NASA will transfer Discovery into its new home at the Smithsonian's National Air and Space Museum annex. (AP Photo/NASA, Bill Ingalls) MANDATORY CREDIT

Associated Press
In this photo provided by NASA, the space shuttle Discovery is suspended from a sling held by two cranes after being flown on a the Boeing 747 carrier at Washington Dulles International Airport, Thursday, April 19, 2012, in Sterling, Va.  NASA will transfer Discovery into its new home at the Smithsonian's National Air and Space Museum annex. (AP Photo/NASA, Bill Ingalls) MANDATORY CREDIT
In this photo provided by NASA, the space shuttle Discovery is suspended from a sling held by two cranes after being flown on a the Boeing 747 carrier at Washington Dulles International Airport, Thursday, April 19, 2012, in Sterling, Va. NASA will transfer Discovery into its new home at the Smithsonian's National Air and Space Museum annex. (AP Photo/NASA, Bill Ingalls) MANDATORY CREDIT
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