More than 20 years since the final Concorde flight, is a small US start-up now on course to bring back supersonic air travel?

He explained a potential scenario: "They're low, they're slow, landing gear down. This is that aerodynamic rock, so once that rolls off on a wing, nose gets down. That's why you saw it accelerate and ...

A brand-new F-35 costs about $80 million. The Franken-bird project, however, will cost U.S. taxpayers just $6 million—less ...