Aer Lingus is the flag carrier airline of Ireland. Based at Dublin Airport, it operates 42 Airbus aircraft serving Europe, Africa and North America. The airline is 29.4% owned by Ryanair and 25.4% owned by the Government of Ireland. It was floated on the Dublin and London Stock Exchanges on 2 October 2006, following prior government approval (the government previously owned 85% of the airline).

Aer Lingus is a former member of the Oneworld airline alliance, which it left on 31 March 2007. While Aer Lingus is not in an alliance it has extensive codeshares with Oneworld, Star Alliance and SkyTeam members, as well as an interline with JetBlue Airways in the United States.