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 ...

Here’s What You Need to Remember: Before the famous SR-71, there was the YF-12, which emerged from Lockheed Martin in the 1960s. During its nine years of existence, the YF-12 had slightly less ...

Laura Sturza BURBANK -- The 40th anniversary of the first flight of a spy-plane designed and built at Lockheed's top-secret Skunkworks facility will be celebrated at events in Palmdale today.

The YF-22 had the edge over the YF-23 and the Air Force prioritized maneuverability for close-range combat. The USAF believed Lockheed had a stronger team, too.

The Lockheed design was selected over Convair's FISH and Kingfish designs, and it served as the precursor to the United States Air Force YF-12 prototype interceptor and SR-71 Blackbird.

Lockheed designer Clarance “Kelly” Johnson held high hopes for the YF-12A, but he would be bitterly disappointed.

The Lockheed YF-22 and Northrop YF-23 both met U.S. Air Force requirements for the Advanced Tactical Fighter.

The distinctive, rhomboid-winged YF-23A lost out to Lockheed Martin's YF-22 in the ATF competition in 1991, but proved a valuable technology testbed for Northrop Grumman, which gave it all-aspect ...