Boom Supersonic's XB-1 demonstrator jet became the first U.S.-made civilian supersonic jet to break the sound barrier. The independently funded XB-1 reached a speed of Mach 1.122, or about 750 mph ...

Pilot watches aren't always dull black-and-white ... Yeah, SST is short for Supersonic Transport. How cool is that? Just looking at the dial, you might be a little overwhelmed at first.