I have never heard of Vne being dependent on altitude/TAS. It is a structural speed that depends on

I have never heard of Vne being dependent on altitude/TAS. It is a structural speed that depends on IAS. Your airplane will only be affected by the TAS when getting close to Mach 1, where the air stops being compressible. I don't think flutter characteristics change significantly with TAS/Altitude to warrant a different Vne. What is coffins corner is where you can't go faster in an airliner due to mach buffet , but can't go slower due to your AOA, minimum stall speed. That's where any turbulence will force you to dive down, which is not a good thing
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