When I say American Concorde, you think of the Boeing 2707. But another design almost won the government contract, the Lockheed L-2000. It was cheaper and easier to build and had it been put into ...

Boom hopes its breakthrough will allow supersonic flights over land, making US coast-to-coast flights 90 minutes faster.

The single-seat jet, a 201-foot-long test model by Boom Supersonic, hit 844 mph just 12 minutes into its latest test flight out of California’s Mojave Air and Space Port.

Boom Supersonic, the American company building what promises to be the world’s fastest airliner, broke the sound barrier for ...