My choices for Focus Cities/Hubs (This will probably never happen but interesting to think about)

STL would be a good Focus City, one of the Terminals is completely empty, AA has gutted there operations completely and there is no longer a real dominate carrier

DCA - There flights to DCA do very well

MSP - I think they could give NW a run for there money on a few routes

Regional Hubs -These airports have about the same passengers per year and a similar in population size to MKE, so it would fit there model

SAT - A Gateway to Leisure/Business Places like Cancun, Mexico City and Southern Cities

Buf East Coast Focus City

Sacramento - West Coast Focus City