Dublin Airport (Irish: Aerfort Bhaile Átha Cliath), is operated by the Dublin Airport Authority. Located in Collinstown, in the Fingal part of County Dublin, 20.5 million passengers passed through the airport in 2009. Dublin Airport is the busiest airport in the Republic of Ireland, followed by Cork 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 over 30 daily departures to other UK Airports. 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.
TERMINAL 2 = Aviation for the 21st Century!
In 2005 the Irish Government directed the DAA (Dublin Airport Authority) to build a new terminal at Dublin Airport as part of its Aviation Action Plan which also included the sale of the majority share holding in Aer Lingus. On 30 August 2006, the Dublin Airport Authority revealed its plans for a second terminal at Dublin Airport, to be located between the existing passenger terminal and the cargo terminal. London-based Pascall + Watson architects (best known for their role in designing London Heathrow Terminal 5) were appointed to design the facility. The total cost of the overall project is put at €600 million. The €600 million 75,000 m2 (810,000 sq ft) new terminal and pier will provide 19 air bridges for aircraft and will be capable of handling 15 million passengers, thereby allowing the airport to handle 35 million passengers a year. Another pier (Pier F) will be built to the south of Terminal 2, accommodating additional passenger aircraft, however this will require the relocation of the current cargo terminal and is unlikely to be required for many years. Aer Lingus and other long-haul carriers will move to the new facility.
Construction of Terminal Two began on 1 October 2007. The building is nearing completion and can be seen as you approach the existing terminal on the main entrance road to Dublin Airport.
Terminal 2 also features a new US pre-clearance immigration facility.
Simulated passenger testing of the terminal will take place in July 2010. In October 2010 the first test flights will operate from terminal 2 up until the full opening in mid November 2010.
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A GREAT AIRPORT, WHICH CONNECTS IRELAND TO THE WORLD, A REAL PLEASURE, EFFICIENT SERVICES, SECURITY AND AMENITIES, GREAT AIRLINES AND FLIGHT TIMES, PLUS CONNECTIONS TO ALL OVER OUR PLANET. EXCELLENT, NOW WE LOOK FORWARD TO TERMINAL 2, THE BIGGEST EXPANSION PROJECT IN HISTORY OF THE AIRPORT IN DUBLIN. ENJOY AVIATION, CELEBRATE THE WORLD, CONNECT, LOVE, LIVE, LIFE, FLY, SEE, FEEL, ENJOY THE WORLD FROM IRELAND AND BEYOND! BE HAPPY!