The major rental companies have desks on the arrivals level. For long term lots E and F take the ATS 'people mover' . The taxi rank is located on the forecourt outside the terminal exit. The CTA service to downtown Chicago leaves from the domestic terminals area. Take the ATS shuttle to Terminal 2.
Bus services are available to downtown and many other area destinations.
Transportation from O'Hare Airport. There is a business center located beneath the Hilton Airport hotel adjacent to the domestic terminals. 773 601-1743 for information. Take the ATS shuttle to Terminal 2 and follow signs for the hotel. Terminal 5 has multi-lingual information screens with languages matched to individual flight arrivals.