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You also gotta spend more energy going up higher, though. If you take the idea to its conclusion you just end up with the solution of taking a rocket from China to SF.

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That's what JATO is for. Just strap some rockets under the wings to get you up to altitude ;)

https://youtu.be/97rSobuKBxI?t=27

Yeah, I guess that's where Elon ended up! SpaceX will do it in the extreme then, without batteries and with just rocket engines.

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