Letters From Our Readers (March 11, 2018)

Credit: joepriesaviation.net
Sounding Off In “Return of High-Speed Air Travel Faces Environmental Headwinds” ( Feb. 25-March 10, p. 58) , the phenomenon of Mach cutoff is described as occurring when aircraft fly at a speed that is supersonic at its cruise altitude, but not on the ground, because the local speed of sound reduces...

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