Oldfield Aero, designated with the FAA identifier 27IA, is a privately owned general aviation airfield located near Keosauqua, Iowa, in Van Buren County. It is a small, private-use facility and is not open to the general public without prior permission from the owner. As a private airfield, it serves personal and agricultural aviation needs typical of rural Iowa. It has no scheduled commercial air service and does not hold an IATA code.