Question: If you are taking the M2 motorway to one of the Northern Ireland's most busiest airport what airport are you going to? 

Context paragraphs:
Ward, Castleknock: Ward (Irish: "An Bharda" ) is a civil parish in Fingal, Ireland.  It is part of the historical barony of Castleknock.  The parish lies to the north-east of the parish of Mulhuddart, and is bounded to the south-east by the parish of Finglas.  Its village, which was originally situated on one of the chief roads to the north of Ireland, has now been by-passed by the M2 motorway.  It is famous as the meeting place of the Ward Stag Hunt.

M3 motorway (Northern Ireland): The M3 is an urban motorway 0.8 miles (1.3 km) in length owned by Siac Construction and Cintra, S.A. that connects the M2 in north Belfast, Northern Ireland to the A2 Sydenham Bypass in east Belfast.  It is the shortest motorway in Northern Ireland, and one of the busiest, carrying 60,000 vehicles per day as of 2005.  It has a permanent speed limit of 50 mph (80 km/h).

A8(M) motorway (Northern Ireland): The A8(M) is a motorway in County Antrim, Northern Ireland.  It is 1 mile (1.6 km) long and is a spur of the M2 motorway.  It was opened on 24 October 1966 and built at the same time as the M2 section to which it connects.  It is part of the unsigned European routes E01 and E18.

M11 motorway: The M11 motorway is a 52-mile (88.5 km) motorway that runs north from the North Circular Road (A406) in South Woodford in northeast London to the A14, northwest of Cambridge, England.  Originally proposed as early as 1915, various plans were considered throughout the 1960s, with final construction being undertaken between 1975 and 1980.  The motorway was opened in stages, with the first stage (between Junctions 7 and 8) opening in June 1975, and the completed motorway becoming fully operational in February 1980.  Running from South Woodford to Girton, the motorway provides direct access to Harlow, a large new town, as well as the city of Cambridge and since 2002, the motorway has greatly improved access to London Stansted Airport, the fourth busiest airport in the United Kingdom.

Belfast International Airport: Belfast International Airport (IATA: BFS, ICAO: EGAA) is an airport 11.5 NM northwest of Belfast in Northern Ireland.  Formerly known as Aldergrove Airport, after the nearby village of Aldergrove, Belfast International is Northern Ireland's busiest airport and the second busiest airport on the island of Ireland, second only to Dublin Airport.  In 2016, over 5.1 million passengers travelled through the airport, marking a 17% increase compared with 2015.

Manchester Interchange: Manchester Interchange is a planned HS2 station at Manchester Airport, on the southern boundary of Manchester, next to Junction 5 of the M56 motorway on the northern side of the airport 1.5 mi north-west of Manchester Airport railway station.  Manchester Airport is the busiest airport outside the London region and offers more destinations than any other British airport.  An airport station was recommended by local authorities during the consultation stage.  The government agreed in January 2013 for an airport station but agreed only on the basis that private investment was involved, such as funding from the Manchester Airports Group to build the station.  The average journey from London Euston to Manchester Airport would be 63 minutes.  The Government approved the scheme in November 2016.

Dublin Airport: 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 5.4 nmi north of Dublin in Collinstown, Fingal.  In 2016, 27.9 million passengers passed through the airport, making it the airport's busiest year on record.  It is the 15th busiest airport in Europe, and is also the busiest of the state's airports by total passenger traffic.  It has the greatest traffic levels on the island of Ireland, followed by Belfast International Airport, County Antrim.

Ballymena (borough): Ballymena is a former local government district with borough status in Northern Ireland.  It was one of twenty-six districts created on 1 October 1973 and covered the town of Ballymena and the surrounding area which includes small towns including Broughshane, Cullybackey, Galgorm, Ahoghill and Portglenone.  The borough has an area of 200 sqmi and a population of 64,044 according to the 2011 census.  The borough had a central location within Northern Ireland and is served by the M2 motorway and with a station on the Belfast-Derry/Londonderry railway line.  Belfast International Airport itself is only 18 mi away and the Belfast City Airport is 30 mi from Ballymena.  It was also accessible to the seaports of Larne and Belfast, 20 and 27 mi away respectively.  As of 2015 it has been replaced by Mid and East Antrim Borough Council.

N2 road (Ireland): The N2 road is a national primary road in Ireland, running from Dublin to the border with Northern Ireland at "Moy Bridge" near Aughnacloy, County Tyrone to connect Dublin with Derry via the A5.  A section of the route near Dublin forms the M2 motorway.

M2 motorway (Northern Ireland): The M2 is a motorway in Belfast and County Antrim in Northern Ireland.  It is in two sections, the southern section running from north Belfast to Antrim and the northern section acts as a bypass of Ballymena, with the A26 road linking the two sections.  In total it is 22 miles (36.2 kilometres).  The M2 has the busiest sections of any road or motorway in Northern Ireland.  The M2 is one of Northern Ireland's most important motorways, forming most of the main route from Belfast city to both Belfast International Airport and less than a quarter of the way to Derry.  It forms part of the unsigned European route E01, E16 and E18 roads.

Supporting paragraphs: M2 motorway (Northern Ireland) Belfast International Airport
Answer: Belfast International Airport