Group of four airmail covers carried on test flights of experimental 'lifting body' aircraft, each filled out with relevant information, and signed by the pilot. Includes: Bill Dana (M2F3, First Supersonic Flight, August 25, 1971); Bill Dana (HL-10, November 19, 1969); Jerry Gentry (X-24A, First Powered Flight, March 19, 1970); and Mike Love (X-24B, First Air Force Runway Landing, August 20, 1975). In overall fine condition.
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