I always thought we could also improve air travel by running it more like a train. For popular routes just permanently schedule a flight say every two hours on

I always thought we could also improve air travel by running it more like a train. For popular routes just permanently schedule a flight say every two hours on the hour. No advanced purchase required. We could build parking garages many stories high or underground so people can park reasonably close. Expensive but way cheaper than high speed rail. Or what if we have secondary airports for commuter routes and leave the major airports for travellors.