Quote:
Originally Posted by electricron
Where? I can't imagine any European or North America. Country allowing constant sonic booms. How? Except for flying very, very high, I can't think of a mitigation technique that would work. There's is a limit to how high you can fly, oxygen in the air is needed for combusting fuel. Even U2 jets have a ceiling height.
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https://www.geekwire.com/2017/nasa-g...ntal-airplane/
Still skeptical?
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