This expansion is a significant step forward in Aer Lingus' partnership with American Airlines, as well as their participation in the wider Atlantic Joint Business (AJB) partnership, which also includes British Airways, Iberia, and Finnair. Additionally, Aer Lingus customers can now book codeshare connecting flights with American Airlines to various destinations in the United States, such as Albuquerque, Nashville, Dallas-Fort Worth, Las Vegas, Kansas City, Portland, San Jose, Tampa, and Tucson.