I have an ~1:00PM flight in a few days. It would be convenient for us to check our bags with AA early morning and take care of some stuff around ORD before returning for our flight. So, in principle, how early could one check their bags before a flight? Added Later: According to post #9 below, Advance Bag Check In is available in Chicago at McCormick Place and Kiss & Fly. Anybody used either service? For example, are they operational all the time, restricted hours, etc?