For Chicago-Louisville (Bowman Field) flights, you can use Chicago Nas Airport, Chicago Rockford Intl. Airport, DuPage Airport, Gary International Airport, Merrill C Meigs Airport, Chicago Midway Intl. Airport, O'Hare Intl. Airport, Chicago Executive - Palwaukee Municipal Airport as departure airport, and Bowman Field Airport, Intercont Airport, Louisville Muhammad Ali Intl. - Standiford Airport for arrival.