Proposed Chicago south suburban airport
The proposed Chicago south suburban airport (also referred to as the Peotone airport) is a proposed airport that would be located in Peotone, Illinois, United States, approximately 40 miles (64 km) south of Chicago. Serving in addition to the two international commercial airports serving Chicago (O'Hare and Midway), the site would serve the south suburbs of the Chicago metropolitan area.
Source: Wikipedia — Proposed Chicago south suburban airport (CC BY-SA 4.0)