what air alliance is aer lingus?
Miguel R. Quinones | Google+. The Irish government has decided to sell its 25 percent stake in Aer Lingus to IAG, parent company of British Airways and Iberia. As a result of this move, Aer Lingus, Irelandâs national airline, will join the oneworld alliance. This is wonderful news for American Airlinesâ frequent flyers.