O'Hare International Airport is a very efficient airport. Though the Windy City can be cold, windy, and raw (all of which I prefer, actually) the accomodations for people-moving are quite efficient. An airline hub, it's a busy spot, with flights arriving and departing from just about every possible location known. The Departures and Arrivals boards are always fun to read. And the transit service to pick up your rental cars are frequent, clean, and have very nice drivers! Ours helped with luggage, and it was appreciated. Seven minutes later we were dropped at a large, clean, spacious building (newly renovated) for all the rental car agencies.