Chicago Rockford International Airport (IATA: RFD, ICAO: KRFD, FAA LID: RFD), typically referred to as Rockford International Airport, Chicago Rockford, or by its IATA call letters, RFD, is a commercial airport in Rockford, Illinois, located 68 miles (109 kilometers) northwest of Chicago. Established in 1946, the airport was built on the grounds of the former Camp Grant facility, which served as one of the largest training facilities for the U.S. Army during both World Wars. The Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2017–2021 categorized it as a non-hub primary commercial service facility.