He uses them interchangeably. But you are cocrert that the Mach ONE in Las Vegas (the company who did this flight) is Mach ONE. Mach I (I believe) is the one in California that filed bankruptcy (also Riggs). Mach 1 is Jason Price who is wonderful and I've covered the difference between them before but now would be a good time to do it again before he again gets a black eye due to a Riggs event.