Boom, the startup developing a new generation of supersonic aircraft, has achieved a major milestone after its test plane broke the sound barrier for the first time. The XB-1 “Baby Boom” piloted by Tristan “Gepetto” Brandenburg, flew through the Bell X-1 Supersonic Corridor over the Mojave Desert. XB-1 reached a speed of Mach 1.1 at an altitude of 35,000 feet for a few minutes before running out of airspace authorized for supersonic travel. The plane would go on to break the sound barrier a total of three times before it returned to base. It’s
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