Is a Mach 4 Passenger Jet Possible? NASA, Industry Explore Idea
Flying from New York City to London up to four times faster than what's currently possible may sound like a far-off dream, but NASA is exploring whether the commercial market could support travel at such speeds. NASA recently investigated the business case for supersonic passenger air travel aboard aircraft that could theoretically travel between Mach 2 and Mach 4 (1,535-3,045 mph at sea level).