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In addition to calling my question 'wrong' - can you also answer it?

Also, if your 'correct' metric were right, then everyone would walk. Does that solve the problems flying does? I don't think so.

[edit]: Also, I guess your metric explains why everyone is only taking the bus or train, and private transportation does not exist?

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I'll answer a different question. The major cost of airplanes is engine wear. Engines have a TBO of maybe 2000 hours, which means about a year's worth of flying at 40 hours per week. For a cheap plane like a basic Cessna, the overhaul is the cost of the aircraft.

If electric planes are lower-maintenance, for GA purposes, they could be a lot cheaper. The hobby would go from millionaires to ordinary folks.

Electric motors don't wear out like combustion ones do.

Sure, and an engine that wouldn't need any fuel/power at all would be even better - the question is, what is practically/theoretically achievable.

But I guess the fact that everyone is avoiding the elementary question of 'how much can a transportation system transport' tells me all I need to know about the practicality here.

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