At the 1973 Le Bourget Air Show, a Tupolev Tu-144 crashed during a flight demonstration. The accident killed 14 people. Back to this crash that happened just 50 years ago. On the last day of the show, Sunday June 3, 1973, two supersonic airliners clashed. On one side there is the Concorde, on the other the Tupolev Tu-144. Both devices are under development. They have been flying for more than four years but none have entered service yet. To snatch orders and convince the undecided, the aircraft manufacturers therefore realize as is the use of flight demonstrations. That day, the Franco-British supersonic aircraft made its flight without incident in front of several hundred thousand spectators. Then it's the turn of the Soviet supersonic. The plane takes off, but after a passage at low altitude, the flight turns tragic. André Turcat, test pilot on Concorde attends the scene. The plane crashed in the town of Goussainville. All six crew members and eight people on the ground are killed. What happened ? Different hypotheses have been put forward. But a year after the accident, the French commission of inquiry and the Soviet experts concluded that no anomaly could be highlighted, neither in the construction, nor in the general operation of the plane and its systems. The causes of the accident therefore remain undetermined. The Soviet supersonic four-engine recognizable by its canard plans was to be a serious competitor to the Concorde. Despite a cruising speed exceeding Mach 2 and a capacity of 120 passengers, the Tupolev did not have the same career. It will only carry out a hundred commercial flights under the colors of Aeroflot. 16 copies were produced until the beginning of the 80s.