On the bright side, flying in Asia and Europe
is still fun and TSA-style abuse is not common.
The way I see it, trains will start getting faster and more abundant
where there is higher population density (eg I-95 corridor).
So people won't be needing to fly from, say, Chicago to NY City.
Or Miami to Philly. Buses will also become more popular as gas approaches
$5/gallon.
This will put less drain on airlines to accommodate everyone, cattle class,
24/7. Airport security will take on a softer tone as costs approach $1 trillion with no successful terror busts.
Also, JFK and La Guardia and LAX can't maintain their 1960's
design. Sooner or later they will be demolished and replaced with
modern airports that are more streamlined and pleasant to be in.