YF-12: The SR-71 Look Alike That Could Have Changed Aviation History
While the SR-71 Blackbird would ultimately surpass its predecessor’s altitude and speed records, the YF-12 would retain its status as the heftiest, largest, and quickest manned interceptor to ever fly the skies.
United States Delta Dart Pratt Whitney Development Gallery Lockheed Martin Central Intelligence Agency
Source: nationalinterest.org