The retirement of the Concorde was the biggest setback to transportation of the past millennium. The future of intercontinental transportation is currently sitting in a museum right now. It can fly from New York to London in 3 hours, and it was made in 1979. Imagine how easy intercontinental flights would be today if we had a modern version of the Concorde. The Concorde was the coolest airliner ever made and nobody will convince me otherwise. The fact that something this groundbreaking was retired still amazes me to this day.