O'Hare International Airport - ORD, offers a variety of options for vehicle rentals. Each rental car company offers free, 24 hour shuttle service. The shuttles pick up at the Arrivals curb front located on the lower level outside of Baggage Claim. Each terminal has designated areas on the outermost curb front where shuttles board. Rental Car companies serving O'Hare Int'l. Airport ORD: Alamo, Avis, Budget, Dollar, Hertz, National, Thrifty. In order to rent a car in Chicago, Illinois the renter must be at least 25 years of age, have a valid permanent (not temporary) driver’s license from the country of residence (non-U.S.), and a major credit card in his/her name.