Soon, you’ll be able to fly from New York to London in about three hours—again. An ambitious group of enthusiasts, engineers, and financiers announced a plan to build a new supersonic transport (SST) aptly named “Boom.” The trade press reports that a half-scale demonstrator and test vehicle, called the XB-1, will fly sometime next year. Presumably, a production version will fly within a few more years, and a lot sooner than the typical timetable for big-plane development at Airbus and Boeing would dictate.