I have been looking at Flytecomm.com and I have noticed that there are alot of charter flights between Chicago and MSP for today(or yesterday). And just this past Sunday there was an AA 757-200 charter into MDW from MSP.
AC has a flight out MDW >A320
WN has two flights out MDW > 737-700s
UA has two out of ORD >735s
Do these flights have anything to do with Hurricane Rita??? Just wondering why so many charters between the two cities.