Denver-based Boom Technology's XB-1 demonstrator plane hit Mach 1.122 — 750 mph. It's the first independently developed supersonic jet. The... A private company aiming to build the first ...
Breaking the sound barrier in a privately developed civil aircraft is a significant aviation milestone by any measure. But as the champagne corks popped and the engines on Boom Supersonic’s XB-1 ...
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