NASA captures stunning image of a supersonic jet shattering the sound barrier / First American-made supersonic civilian jet breaks sound barrier in flight over the Mojave Desert / Independently funded jet's sound barrier mark revives talk of commercial supersonic travel / First independently developed jet breaks the sound barrier over the California desert / Civilian jet breaks sound barrier during historic test flight in U.S. / Boom Supersonic's next-generation XB-1 passenger plane 1 step away from breaking the sound barrier