An Air Force Flight Test Center B-52H performs a captive carry flight of the X-51A WaveRider (white object under left wing) over Edwards AFB, Calif. on Dec. 9, 2009. Officials said the captive carry mission was a key test milestone in preparation for the early 2010 first light of the X-51's scramjet engine during the vehicle's first powered hypersonic flight.
US Air Force photo/Mike Cassidy
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