Cobb County Airport - McCollum Field (ICAO: KRYY, FAA LID: RYY) is a public airport located 21 miles (34 km) northwest of the central business district of Atlanta, immediately south of the city of Kennesaw in Cobb County, Georgia, United States. It operates 24 hours per day, although it is not controlled between the hours of midnight and 6:00 a.m. (EST/EDT)..