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Comment by pfannkuchen | Hacker News Reader

Yes, the planes taxi to a terminal under the city.

It would create problems, but the problems would be for the designers and maintainers of the infrastructure, not for the passengers.

Airplanes are not fundamentally that much bigger than trains, which routinely go under the city.

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You have airports that are pretty convenient to the city (assuming that's where you're going). Boston. SFO is at least on BART. The old Hong Kong airport. But newer airports tend to be pretty far out because they presumably need more land and that land isn't available near the city.

It's also because city residents will not, under any circumstances, allow a new airport to be built anywhere near them.

Trains don't need wings, so they're a lot easier to build tunnels for..

Yes, they are - if you count wings, which are the main point of a plane.

So as a reader one can assume that either a) I forgot about the wings (I guess I must be an idiot) or b) I am using a broader set of reference objects than simply "current passenger transportation modes". There are many man made objects much bigger than airplane wings. Fitting an aircraft carrier, or a container ship, or a skyscraper, moving under a city, would be much, much harder than fitting an airplane. Not to mention that if we strongly applied this engineering constraint, it's not beyond the realm of imagination that we could produce airliners with removable or foldable wings, or where the passenger compartment slides out, or tunnels with deep grooves for the wings, etc.

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