I'm a Wisc resident and flew thru O'Hare to Houston last fall to meet up with relatives and go shoot some hogs. No issues with guns. Matter of fact, I don't think I made it 5 steps in the departure terminal with my gun case in tow before I was asked "Is that a firearm?" When I answered yes, I was immediately escorted to the head of the check-in line, declared the firearms, checked in, went with the TSA agent, and then off to my gate. On the way to the gate I thought, "Gee, maybe I should fly with a BB gun next time thru O'Hare if I'm gonna be able to go to the head of the line."
