In 1947, Chuck Yeager became the first human to break the sound barrier when he pushed the Bell X-1 past Mach 1 during a flight over the Mojave Desert. Boom Supersonic's XB-1 is a stepping stone ...
About 35,000 feet (10,670 meters) over the Mojave Desert, northwest of Los Angeles, Boom Supersonic's XB-1 became the first privately funded airplane to break the sound barrier during a test ...