Aer Lingus and American Airlines have expanded their codeshare agreement to include additional services between Ireland and the US. The codeshare deal, first launched in 2022, will now cover flights from Dublin to both Philadelphia and Chicago.

Yes, Aer Lingus and American Airlines are significant partners with a relationship that reached full integration in early 2026. While Aer Lingus is not a member of the Oneworld alliance, it participates in a transatlantic joint venture alongside American, British Airways, Iberia, and Finnair. As of January 2026, this partnership is more robust than ever, allowing AAdvantage members to not only earn miles and Loyalty Points on Aer Lingus flights but also to book award seats online directly through the American Airlines website. Furthermore, the two carriers offer reciprocal elite status benefits; for instance, American Airlines Platinum Pro and Executive Platinum members can enjoy lounge access, priority boarding, and extra baggage allowances when flying on Aer Lingus. This deep partnership makes it seamless for travelers to book "codeshare" flights that combine segments from both airlines on a single itinerary, providing extensive connectivity between the United States and Ireland, as well as beyond through Aer Lingus’s Dublin hub.