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In common parlance, one hears things like "The Concorde flies (used
to fly) at Mach 1.5," Or "the F-16 can do Mach 2," or "the Space
Shuttle reaches Mach 25 at some point during its reentry," and
descriptions such as these.
The question is: since Mach number refers to the local speed of
sound, it varies with altitude. So is there a hidden assumption that
all Mach numbers referring to flying speed are (supposed to be)
quoted with respect to the speed of sound at a reference temperature?
Stefan Jeglinski