KRFD-Chicago Rockford International Airport https://www.airnav.com/airport/KRFD

Chicago Rockford International Airport (IATA: RFD, ICAO: KRFD, FAA LID: RFD), is a general aviation and commercial airport in Winnebago County, Illinois. It is 85 miles (136.7 km) northwest of Chicago and four miles (6 km) south of Rockford. The airport served over 100,000 passengers in 2015.