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X-43A Hypersonic Experimental Vehicle mounted onto a B-52.

NASA’s B-52 mother ship carries the X-43A and its booster rocket on a captive carry flight Jan. 26, 2004

NASA's historic B-52 mother ship carried the X-43A and its Pegasus booster rocket on a captive carry flight from Edwards Air Force Base Jan. 26, 2004. The X-43A and its booster remained mated to the B-52 throughout the two-hour flight, intended to check its readiness for launch. The hydrogen-fueled aircraft is autonomous and has a wingspan of approximately 5 feet, measures 12 feet long and weighs about 2,800 pounds.

Image Credit: NASA / Carla Thomas