If you are taking the M2 motorway to one of the Northern Ireland's most busiest airport what airport are you going to? 
M2 motorway (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. Belfast International Airport:  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.
Belfast International Airport