But what if the car could drive itself? Would you prefer it then?
the US does a lot of trains, but generally for short distances on commuter corridors, and municipal light rail. we don't do high speed passenger rail, which is probably what you're thinking of.
You can choose from literally hundreds of car seats when purchasing a vehicle, and I have never, ONCE been in a car seat less comfortable than the standard airline economy seats which, despite coming from different manufacturers across different airlines, are universally terrible. Flat as a board so you put pressure on your tailbone, no support anywhere, just terrible. I'd rather sit on a park bench.
Give me the option of paying $200 per ticket to sit in my car's seats on an airplane, I'd do it every time.