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Concorde
The Aerospatiale-BAC Concorde supersonic transport (SST) was one of only two models of supersonic passenger airliners to have seen commercial service. Concorde had a cruise speed of Mach 2.02 (around 2,170 km/h or 1,350 mph) and a maximum cruise altitude of 60,000 feet (18 300 metres) with a delta wing configuration and a reheat-equipped evolution of the engines originally developed for the Avro Vulcan strategic bomber. In regular service, Concorde employed a relatively efficient cruise-climb. As aircraft lose weight from consuming fuel, they can fly at progressively higher altitudes. This is (generally) more efficient, so conventional airliners employ a stepped climb, where air traffic control will approve a change to a higher flight level as the flight progresses.
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