I don't see a new focus city coming anytime soon, anywhere. MDW will never happen because JetBlue has no desire to even try competing with Southwest or deal with those weather delays in the winter. I could imagine STL or MKE, or even AUS, as being better contenders. That said, JetBlue doesn't have the staffing or equipment necessary to open up a new focus city without drastic cuts to existing service.

AUS already has flights to all five mainland focus cities. Add DCA, PBI, SJU, BDL, and maybe SFO or SLC into the mix, and you have yourself a connecting point.

-J.