Can a Colorado startup bring back supersonic air travel?
It's been almost 13 years since travelers could zip across the ocean at twice the speed of sound. That's when the last Concorde jet was retired -- a plane that typically flew at 1,300 mph, twice as fast as a conventional jetliner. The Concorde could fly from New York to London in about 3-1/2 hours. But the speedy jet guzzled fuel and carried only a fraction as many passengers as a sub-sonic jumbo jet. And tickets cost as much as $20,000.