O'Hare International Airport

General aviation reliever airport northwest of downtown Chicago, serving business, private and charter flights and offering flight training and FBO services for the northern suburbs.

Serving Chicago’s Southwest Side and downtown, it handles mainly domestic flights with a strong presence of low-cost carriers and easy connections via the 'L' Orange Line and nearby expressways.

Former single-runway general aviation facility on Chicago’s lakefront adjacent to downtown, serving business and private flights until its abrupt closure in 2003.

General aviation reliever near Chicago in West Chicago, Illinois, serving corporate, private and flight-training traffic with hangars, FBO services and maintenance, convenient for access to the western suburbs.

Milwaukee’s primary commercial airport serves domestic and seasonal international routes about 10 miles south of downtown, offering rental cars, transit links and year‑round airline service.

Serving Rockford and northern Illinois, the airport handles domestic passenger flights and is a major cargo hub. Convenient ground links provide access to the Chicago metro and surrounding communities.