Originally Posted by
DavidDTW
If most of your flying will be domestic, WN from MDW might also be an option. Southwest has a big hub at Midway.
Depends on where you live. I'm 15 min. from ORD and what seems like another country--and more than 5x taxi fare--from Midway.
As for the OP's question, I fly UA because it has better fares and schedules for my destinations.