A North American X-15 research plane under the wing of a B-52 prior to launch.
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Photo credit: © CBW / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: -52, -15, -plane, -series, aeroplane, aircraft, airplane, altitude, american, aviation, boeing, dryden, experimental, flight, hypersonic, north, pilot, pilots, plane, race, records, research, rocket, rocket-powered, space, spaceplane, test, test-bed
