American Airlines places big bet on supersonic travel

American Airlines has put down a nonrefundable deposit for 20 supersonic passenger jets that are still being designed and years away from flying.

It’s unclear how long it will take for the planes to be built, let alone ready to take off with commercial passengers aboard, as the aircrafts — made by Boom Supersonic — do not yet have an engine maker. Boom said it expects the airplanes to be operational…