SR-71A/YF-12 Blackbird Taxi And Takeoff From Edwards Air Force Base (1974) | AiirSource

The Lockheed YF-12 was an American prototype interceptor aircraft, which the United States Air Force evaluated as a development of the highly secret Lockheed A-12, which also spawned the Lockheed SR-71 Blackbird. YF-12 is the world's largest manned interceptor to date.

This YF-12 aircraft, the "YF-12C", was actually the second SR-71A (61--7951). This SR-71A was re-designated as a YF-12C and given a fictitious serial number 60-6937 from an A-12 to maintain SR-71 secrecy. The YF-12C was loaned to NASA for propulsion testing after the loss of YF-12A (60--6936) in 1971. The YF-12C was operated by NASA until September 1978, when it was returned to the Air Force. -Wikipedia

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