Denver-based startup Boom Supersonic is developing an all-new supersonic plane that aims to do what the Concorde never could—take people from New York to London in under 3.5 hours at business-class prices. Though the plane won’t likely debut until the early 2020s, Boom unveiled a scale model in 2016. It has signed on with the Virgin Group as its likely initial customer; Richard Branson’s company has options on the first ten planes. CEO Blake Scholl has assembled a staff of 25 with deep experience across the aviation industry, and on the strength of that expertise, it has already booked $5 billion worth of business—though it has yet to get its hands on that money. Boom cites a market study that suggests there is potential global carrier demand for around 1,300 of its planes. What makes Boom’s supersonic plane economically feasible is that it has just 45 seats, all of which will be business class.