16 stunning pictures of the YF-12: A Mach 3 fighter jet from the 1960s

16 stunning pictures of the YF-12: A Mach 3 fighter jet from the 1960s ...

Did you know that the YF-12 was the start point for the famous and terrifying SR-71? According to NASA, "the YF-12 "Blackbird" was an experimental fighter-interceptor version of the Lockheed A-12 reconnaissance aircraft.

A record-breaking a ...

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