The Avion de Transport Supersonique Futur (ATSF) also known as Alliance was a concept design for supersonic aircraft considered by British Aerospace and Aérospatiale. The plane was to be based on the experience learned from the supersonic Concorde, 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.
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