Belfast International Airport (IATA: BFS, ICAO: EGAA) is a major airport located 11.5 NM (21.3 km; 13.2 mi) northwest of Belfast in Northern Ireland. It was formerly known and is still referred to as Aldergrove Airport, after the village of the same name lying immediately to the west of the airport. Belfast International shares its runways with the Royal Air Force base RAF Aldergrove, which otherwise has its own facilities.
Around 4.1 million passengers travelled through the airport in 2011, an 2.3% increase on 2010. Belfast International is the busiest airport in Northern Ireland and the second busiest airport on the island of Ireland in terms of passenger numbers after Dublin Airport, and is followed by Belfast-City, Cork and Shannon.
Belfast International has a CAA Public Use Aerodrome Licence (Number P798) that allows flights for the public transport of passengers or for flying instruction. The airport's rather distant location compared to Belfast-City means that the airport operates 24 hours a day, 365 days a year and is not subject to noise abatement procedures, significant environmental constraints or airspace limitations.