Boom wants to build a supersonic jet for mainstream passengers; here’s its game plan

While much of the world remains fixated on the competition to build autonomous cars, there’s another race that’s gaining momentum fast. It centers on supersonic jets that can fly faster than the speed of sound, or 767 miles per hour. Indeed, while most commercial airliners today fly at between 400 and 650 miles per hour — largely because it’s more economical to burn fuel more slowly — a spate of startups is borrowing from the age of the legendary Concorde to build p