but nevertheless there is a lot of naievity and ludditism still here. There is nothing conceptually impossible.
I don't think too many people disagree with the concept being
possible.
We could all probably agree that a moon base (Moon Base Alpha?) was feasible probably a decade ago but is it practical?
When ALL trains around the world are driver less THEN you may be getting close. As it is, whoever said that the pilots are the biggest expense after fuel is an idiot. Work out what your salary means as a hourly rate then think about spare parts, landing fees, insurance and depreciation.