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Exactly. I think this fails because of comfort requirements. If you stacked people inside airplanes like this, I'm sure they would be 10x more efficient and competitive with this proposal.

I think this would be great for journeys of _under_ 30 minutes. And it wouldn't be for everyone, for sure -- so starting off as a niche transportation mode is not a great start.

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Elon mentions in the paper that even on planes today landing procedures take over 30 mins, and during that time people can't get out of their seats, and everybody is ok with it. For longer routes you would definitely need more space, but then he also describes the model that would allow for carrying cars, which is a lot more space.

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