> it's great to get into the train without doing all the procedures you do with a plane.

Well, if they just let go of the security theater and phobias, we could theoretically have a situation where you just board with no procedures, like on a train: Ride a local train/metro/bus up to the larger train station, flash your card or pass or what-not, maybe flash your passport, put your suitcase on the baggage cart or beltway going up to the cargo hold, and get on the plane. No queues, no checks and no nothing - basically like a train.

I realize it's not that trivial to switch to that way of thinking of air travel, but again - not impossible.