This plane could cross the Atlantic in 3.5 hours. Why did it fail?

We had supersonic transport — until almost 15 years ago, when it stopped. You might remember the Concorde, the supersonic plane that came to symbolize technological optimism and extreme luxury. Though it always had critics and a high ticket price, it delivered on the promise of supersonic transport, giving riders trans-Atlantic flights in under four hours. (www.vox.com) More...