In the mid-1960s, Lockheed’s Mach 3 YF-12 and North American Aviation’s Mach 3 XB-70 Valkyrie were both flying test missions ...

During the Cold War, the United States wanted to study high-speed, high-altitude flight using a fighter interceptor. As a result, the experimental YF-12 was developed, which set two world records on ...

Summary: The Lockheed YF-12, developed in the late 1950s and early 1960s, was a groundbreaking interceptor designed to counter Soviet bombers during the Cold War. -Capable of reaching speeds of Mach 3 ...

Here’s What You Need to Remember: The last remaining YF-12 saw continued use, however, in joint supersonic cruise testing between NASA and the U.S. Air Force, until it was ultimately retired to the ...

The cover of Aviation Week & Space Technology’s Aug. 3, 1970, issue features a NASA Flight Research Center YF-12 over the Mojave desert prior to landing at Edwards AFB, California, following an ...