Aer Lingus is the flag carrier airline of Ireland and the second-largest airline in the country after Ryanair. Founded by the Irish government, it was privatised between 2006 and 2015 and it is now a wholly owned subsidiary of International Airlines Group (IAG), the parent company of British Airways and Iberia. The airline's head office is on the grounds of Dublin Airport in Cloghran, County Dublin, Ireland.
Formed in 1936, Aer Lingus is a former member of the Oneworld airline alliance, which it left on 31 March 2007. After the takeover by IAG, it was expected that Aer Lingus would re-enter Oneworld, however, at a press briefing on 15 November 2017 the airline's CEO Stephen Kavanagh stated that the airline has "no plans to join Oneworld". The airline has codeshares with Oneworld, Star Alliance and SkyTeam members, as well as interline agreements with Etihad Airways, JetBlue Airways and United Airlines. Aer Lingus has a hybrid business model, operating a mixed fare service on its European routes and full service, two-class flights on transatlantic routes.