For me, RUT - Rutland State Airport. US used to have a BOS-LEB that stopped in RUT (dropped a while back)....the RUT-LEB segment running about 10 min max.
The setup at RUT is pretty funny - they have a house there instead of a terminal bld. Having national guard troops outside after 9/11 was quite a sight.
Nowadays only CO operates out of RUT, it seems.