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The now obsolete Concorde had a cruising speed of Mach 2.2 This is about l500 MPH at the normal cruising height of the Concorde- 60,000 Feet. The Mach factor is constant only at sea level-760 MPH.- it decreases at altitude for a number of factors including the decreasing atmosphere and wind resistance (for this reason it is not normally applied to space vehicles outside the atmosphere, no atmosphere, no sonic velocity!) The Concordes had two speedometers,conventional and Mach at the two pilot stations, that is on both sides of the cockpit. For some reason the Red Line or absolute maximum safe speed (velocity never exceed) was never publicized.

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