Well, I think the cause of your burden is quite clear. There's a direct correlation between the above two line.Count me in the camp of people who believe that flying is a bigger burden than driving.
I live three hours (with no traffic) from an airport with a direct flight to SLC.
I live less than an hour from 3 airport that have many flights. So any given time, I can almost always find direct flights to just about anywhere. (Doesn't mean it's cheap, that takes advance purchase). The equation for me is VERY different than for many others.