Allen Army Airfield (IATA: BIG, ICAO: PABI, FAA LID: BIG) is a public and military use airport serving Fort Greely and located three miles (5 km) south of the central business district of Delta Junction, a city in the Southeast Fairbanks Census Area of the U.S. state of Alaska. It is owned by the United States Army, which has an agreement with the City of Delta Junction for joint use of the airfield by both military and civilian aircraft.