And until they overbook seats on the train and you end up getting bumped back to a later departure regularly because they refuse to build more tracks over prime real estate to support more trains... I think it would be a lot more cost effective to find a solution to the current scheduling/ground problem we have right now.

The way I see it we aren't running out of sky, we're just running out of concrete for the big shiny flying things to land on. The country just needs to bite the bullet and add a few runways here and there to alleviate the horrendous state of air travel as it is right now.