All 109 people on board and four on the ground were killed on July 25, 2000, when Air France Flight 4590 crashed shortly after takeoff from Charles de Gaulle airport near Paris. The crash was the first fatal accident of a Concorde jet, and helped lead to the aircraft's retirement in 2003.

The Concorde gave us supersonic transport. But why did this supersonic plane fail? The answer is complicated â?? Vox's Phil Edwards investigated.