History of Mach 1: Yeager Breaks the Sound Barrier

On June 10, 1948, The U.S. Air Force confirmed that Capt. Chuck Yeager had repeatedly attained supersonic speeds in the Bell X-1.

Yeager’s Background

But it was on October 14, 1947, that Chuck Yeager, who died in 2020, actually broke the sound barrier, Mach 1, for the first time.