Chicago/Aurora Municipal Airport is a public airport opened in April 1966, located in the village of Sugar Grove, Illinois, United States, 8 miles west of the city of Aurora, both in Kane County. The airport is owned and operated by the City of Aurora. It is 50 miles west of Chicago and is designated as a reliever airport for Chicago's O'Hare and Midway airports.
Although most U.S. airports use the same three-letter location identifier for both the FAA and IATA, Chicago/Aurora Municipal Airport is assigned ARR by the FAA and AUZ by the IATA. The airport's ICAO identifier is KARR.