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Technology, or rather, lack thereof. As others pointed out, planes need to bring their own energy supply and use additional energy for that. Weight is a very big factor for air transport’s energy consumption. Fossil fuels have a very high energy density, which make them great for bringing along. Once light weight battery tech (without excessively large sizes) becomes available, it should be no issue to electrify planes. Alternatively, find another source of electricity. E.g. nuclear has a much higher energy density than fossil, but obviously has it’s own issues, as do all other currently available tech options.

Planes and trains are also quite close to each other and in many cases cover the same routes. However, planes run 100% on fossil fuels, trains are often electric.

This made me wonder, are there any mechanical switches that can be switched by a smart something? As in, a regular switch where the user always has mechanical control, even when the smart system is down, but that optionally can be switched by a smart sytem, state reading is optional.

Which, although they don’t improve conditions for the workers, are also expensive