Wired has an article on the status of new supersonic travel projects.

Boom Technology, based in Denver, Colorado, is building a jet that could fly around 50 people at Mach 2.2, or 1,452 mph, more than twice the speed of sound. Nevada’s Aerion Corporation is making a pointy-nosed business jet, good for Mach 1.5. Both want to make their first deliveries by 2023.

NASA and Lockheed Martin are working on a Low Boom Flight Demonstrator to show that the thundering sound that shadowed the Concorde—and prevented flights over land—can be minimized. That plane may one day get an X designation, labeling it as the latest in a long line of experimental aircraft. It’s a fitting callback to the very first X plane.