XB-1 First Supersonic Flight - YouTube Watch On Boom Supersonic plans to break the sound barrier during a test flight this morning (Jan. 28). This would mark the first time the company achieves the feat, and you can watch the historic action live.Colorado-based Boom's XB-1 test vehicle is scheduled to lift off on its 12th test flight from California's Mojave Air & Space Port today at around 11:00 a.m. EST (1600 GMT; 8 a.m. local California time). If all goes well, the piloted demonstrator craft ...