Dublin International Airport is the busiest airport in Ireland and due to the booming economy is only getting busier. It is the headquarters of 2 of Europe's most successful airlines, Aer Lingus and Ryanair. It is served by a mix of European and North American airlines, with Ethiad (who flies to Australia via Abu Dhabi), one of the more unusual visitors. DUB is in the midst of a massive expansion, with the 2010 addition of Terminal 2.