Yes many of these commuter policies will require you to list for two flights to get you there by a certain time before check-in that have seats available. Out of a small mountain town with limited RJ service only this could be literally impossible. Also the computer policy is not unlimited you will only get a certain number of missed commutes within a certain time before it counts against you on the attendance scale. Once you max out the scale they will fire you. Then you will have the awkward situation of explaining what happened on future airline interviews. So you can see how most of the time commuting is a very bad idea.