Easy way of figuring that out is going to passrider.com and looking at schedules between any two cities. Most frequencies per day is usually a good indicator of commutability - particularly early and late flights. A caveat to that is hub-to-hub travel...our nonrev priority sucks on mainline, so it can frustrating to get from DFW-LGA, for instance, when all Envoy and AA commuters are trying to do the same at higher nonrev priority. Throw in some IROP, and you've got an especially painful commute. Fortunately in that specific case, we operate a few of Delta's DFW-LGA, and the jumpseat can be your saving grace on our metal.