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,[1] which has an agreement with the City of Delta Junction for joint use of the airfield by both military and civilian aircraft.

Fort Greely was built south of the airfield after World War II.

Allen Army Airfield resides at elevation of 1,285 feet (392 m) above mean sea level.

[2] For the 12-month period ending January 3, 1984, the airport had 29,200 aircraft operations, an average of 80 per day: 91% military and 9% general aviation.