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A comment on Boom (YC W16) – Supersonic Passenger Airplanes. Parent comment

Re:Boom (YC W16) – Supersonic Passenger Airplanes by jonknee on Monday March 21, 2016 @04:46PM (#11331842)
... Sonic booms happen anytime you're going supersonic speeds, it's not limited to when you cross the boundary.

https://en.wikipedia.org/wiki/Sonic_boom

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