Well, I might as well give you some advice on O'Hare since I'm from the Chicago area. Be glad you don't have to go through any metal detectors, I've had to take my belt off at O'Hare going through them. Other than having a good pair of walking shoes, nothing else you need to worry about. Oh, and a word of advice from my mother, buy some White Sox memoribilia while you're at O'Hare.