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A comment on A passenger aircraft that flies around the world at Mach 9? Sure, why not. Parent comment

Re:A passenger aircraft that flies around the world at Mach ... by saagarjha on Tuesday April 04, 2023 @08:08AM (#35438280)
Generally these planes fly very high and encounter reduced air resistance.
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Re:A passenger aircraft that flies around the world at Mach ... by geysersam on Tuesday April 04, 2023 @08:45AM (#35438743)
Okay, but 9 Mach is a lot. And flying higher also burns more fuel to reach that altitude. Not sure which of the effects dominate though.

All in all, I'd be extremely surprised if this technology reduces fuel consumption.

The only mention in the text about fuel usage is that they need to use a special engine with lower fuel consumption to even be able to put people and equipment on the plane. Why don't regular jets have that problem? Because they don't consume that much fuel.

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