X-Plane 10. 25 – Scenery Chicago Midway Airport(KMDW), Illinois (IL), USA, 2.0. Chicago Midway International Airport is in Chicago, Illinois, United States, on the city’s southwest side. Midway is the second-largest passenger airport in the state of Illinois. In 2005, Chicago Midway International Airport was the 30th-busiest airport in the United States in terms of passenger traffic. Requires OpenSceneryX and RUScenery. Uses Barrier object by GOLF1. By Rene Bruun.