MKE once JB aquires parts (the parts that don't include a Denver hub) of Frontier's operation. They will use MKE to spread out their network and give them access to the Chicago market.....you heard it here first
This is, of course, part of the grand plan eventually involving VA and creating a nation-wide route network with excellent east and west coast hubs and MKE in the middle
Call me crazy but it would make a pretty nice network.