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Re:American Airlines agrees to purchase Boom Supersonic Over... by snovv_crash on Tuesday August 16, 2022 @11:56AM (#32484576)
Descending and climbing again will take a lot of fuel, jets are only efficient at high altitude. Plus of course the extra takeoff and landing adding cycles to the airframe.
Re:American Airlines agrees to purchase Boom Supersonic Over... by Turing_Machine on Tuesday August 16, 2022 @12:18PM (#32484907)
Sure, but if it's the difference between "can" and "can't"...

It's a small enough issue that it's the routine route for cargo flights between China and the U.S. West Coast.

Anchorage is the second-largest cargo airport in the United States (after FedEx's home base in Memphis).

Re:American Airlines agrees to purchase Boom Supersonic Over... by Scoundreller on Tuesday August 16, 2022 @01:33PM (#32486057)
Part of that is because cargo usually runs on old and inefficient planes, so they really benefit from “intermediate stop operations”. Carrying all that extra fuel for a direct long-haul adds 10-15% in fuel costs.