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Re:American Airlines agrees to purchase Boom Supersonic Over... by ZeroGravitas on Tuesday August 16, 2022 @11:52AM (#32484491)
I believe supersonic flight is currently banned over the USA (and most countries?).

A previous entrtant in this area seemed to suggest that efficiency dropped near mach 1, but then rose again to 95% at speeds around 1.4 so being able to stay at that speed may make it cheaper to run and maximize their USP of speed.

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