Wearing sandals to the airport saves time when going through security. Also remember to limit the jewelry you wear when leaving for Chicago. The less metal on you, the quicker you go through security. Also, remember that if you are like me and like to take your makeup with you in your carry-on, that you get trial size containers so you don't go over the limit of liquids you can carry on with you. (I contact my "makeup lady" and she gets me the sample sizes which are perfect for a 3 night trip.