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I think the aerodynamics have already been taken care of. It's not like passenger planes at supersonic speeds have not already been done. It's more a question of fuel efficiency, storage, and capacity. Musk may be thinking of some things that haven't been tried (publicly) but are likely already in use in some flying machines. There's been a rumor that high-altitude stealth planes are using some kind of ionic field to both mask themselves and lower their air resistance at speed. No idea how that would work, since I'm not a physicist.