British Airways parent IAG acquired Aer Lingus and the Irish carrier is expected to join oneworld.
Aer Lingus is a former member of oneworld — they left nine years ago to pursue a strategy as a low cost carrier. Since then they’ve built back their premium offerings. They have a good transatlantic business class, considering the short flights between Dublin, Shannon and the East Coast of the U.S. which are their bread and butter (though not exclusive) destinations.