An International Airport
Dublin Airport (Irish: Aerfort Bhaile Átha Cliath), is operated by the Dublin Airport Authority. Located in Collinstown, in the Fingal part ofCounty Dublin, 23.5 million passengers passed through the airport in 2008. Passenger traffic at Dublin Airport is predominantly international; only 900,000 of its 23.2 million passengers in 2007 were domestic. Dublin Airport is the busiest airport in the Republic of Ireland, followed byCork and Shannon. It is the busiest on the island of Ireland followed by Belfast, Cork and Shannon.
The airport is located 5.4 NM (10.0 km; 6.2 mi)  north of Dublin City in a once-rural area near Swords, and is served by buses and taxis. An underground railway line called 'Metro North' which will connect the airport to Swords and Dublin city centre has been approved and is in development.
Dublin Airport is the headquarters of Ireland's flag carrier Aer Lingus, Europe's largest no-frills airline Ryanair & Ireland's domestic, regional airline Aer Arann. Ireland's third airline, CityJet, is based in the nearby town of Swords.
The airport has an extensive short and medium haul network, served by an array of carriers. Domestic services are offered to most regional Irish airports. There are approximately 50 daily departures from Dublin to all five London airports (Stansted, Luton, Gatwick, Heathrow and London City), The Dublin-London route is the second busiest route in the world after the Hong Kong-Taipei route. There are up to 30 daily departures to other smaller UK Airports and to Manchester Airport. There is also a reasonably sized long-haul network. Aer Lingus serves many popular US destinations, and has been able to add more thanks to the open skies deal. US legacy carriers also serve the airport from major US hubs.Etihad Airways operates a daily service between the airport and Abu Dhabi.United States border preclearance services are available at the airport for US-bound passengers, Dublin being one of only two European airports with this facility, along with Shannon.