The next three prototypes will concentrate on developing the remote takeoff and landing system, breaking the sound barrier and, finally, pushing past Mach 3.3.

In 1993, the US Congress re-examined the SR-71 due to political unrest in the Middle East and North Korea. It was agreed to add $100 million to the budget to return three SR-71s to service, but ...

US Air Force's Alleged Top Secret SR-72 To Take Flight And Break The Sound Barrier In 2025 by Nathan Ord — Wednesday, January 03, 2024, 10:39 AM EDT Comments ...

While Bell's X-1 "Glamorous Glennis" was the first plane to break the sound barrier and go faster than Mach 1 in 1947, U.S. Air Force's Ed Yeildling and Joseph Vida would more than double that in ...

Apparently, Ben Rich, the Skunk Works vice president at the time, wanted the last SR-71 flight to be made at max speed, so he asked some of his engineers if the jet could be flown at Mach 3.5.