TTN (Trenton NJ), several times. I'd take a bus from the Trenton train station to as close as you could get (which was still at least a mile away). Not a fun walk to the terminal, but a quiet and peaceful one at least.

Any cab you could get from the train wanted at least $40, which isn't terrible but always psychologically conflicted me since the reason I was flying out of TTN was because I was getting a $30- $40 flight on Frontier (doubling my travel cost for an extra 3 miles seemed weird to me)