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The Avion de Transport Supersonique Futur (ATSF) also known as Alliance, was a concept design for supersonic transport considered by British Aerospace and Aérospatiale. The plane was to be based on the experience learned from the supersonicConcorde, and was to fly at Mach 2 or higher. Preliminary designs were produced, with some wind-tunnel testing of small-scale models, but development apparently stalled in the early 2000s.