As of 2026, Aer Lingus maintains a robust network of partnerships with major U.S. carriers, primarily through its membership in the International Airlines Group (IAG) and its deep ties with the Oneworld alliance. Its primary U.S. partner is American Airlines, allowing passengers to book seamless codeshare flights from across the United States to Dublin and Shannon, with frequent-flyer reciprocity for AAdvantage and AerClub members. Additionally, Aer Lingus has a long-standing partnership with JetBlue, which serves as a major feeder for Aer Lingus flights departing from East Coast hubs like New York (JFK) and Boston (BOS). While Aer Lingus is not a member of the Star Alliance, it maintains a unique "interline" relationship with United Airlines, primarily for baggage and connectivity, though this is less integrated than the American Airlines deal. For travelers in 2026, these partnerships mean you can often check your bags through from a regional U.S. airport like Pittsburgh or Raleigh-Durham all the way to Ireland, earning "Avios" (the common currency of IAG) along the way regardless of which metal you are flying.