[Deritio]

That's not true.

Public transport is factors more efficient than air travel.

And yes including initial cost.

We build infrastructure to last not to throw it away 5 years later.

You need to understand how much more energy it actually costs to bring a plain up in the air and down again. We talk magnitude more energy than trains.

We can talk about this again in 20 years when solid state batteries are broken through.and sustainable energy sources are the norm.

Air taxi's ate not hard to build on a technical level. We know how to build them.