Dublin Airport (Irish: Aerfort Bhaile Átha Cliath) (IATA: DUB, ICAO: EIDW) is an international airport serving Dublin, the capital city of Ireland. It is operated by DAA (formerly Dublin Airport Authority). The airport is located 10 km north of Dublin in Collinstown, Fingal. In 1917, during World War I, the townland of Collinstown was selected as the site of a base for the British Royal Flying Corps. At the end of 1922 the land and buildings at Collinstown were transferred to the Irish Free State. The airfield quickly fell into disrepair and grass grew on the former runways.
In 2018, over 31.5 million passengers passed through the airport, making it the airport's busiest year on record. It is the 13th busiest airport in Europe, and is also the busiest of the Republic of Ireland's airports by total passenger traffic. It has the greatest traffic levels on the island of Ireland, followed by Belfast International Airport.
The airport has an extensive short and medium haul network, served by an array of carriers, as well as a significant long-haul network focused on North America, the Middle East and East Asia. It serves as the headquarters of Ireland's flag carrier – Aer Lingus, regional airline Stobart Air, Europe's largest low-cost carrier – Ryanair, and ASL Airlines Ireland, together with another two airlines, CityJet and Norwegian Air International.