Airport Express ticket counters are located across from Southwest Airlines baggage claim at Midway airport.
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At O'Hare Airport they are on the baggage claim level in each terminal:
Terminal 1 (door 1E), Terminal 2 (door 2E), and Terminal 3 (door 3E), Terminal 5-international (outside door E, middle lane). At Midway airport the ticket booth and loading zones are by Door 3.
(Private CHARTERS available. Please call 773-843-2420.)