Aer Lingus is the flag carrier of Ireland and the country’s second-largest airline after Ryanair. It flies to 80 destinations in Europe, Asia, Africa and the United States, where it serves Boston, Chicago, New York and Washington, D.C.

In the world of points and miles, Aer Lingus is an oddity, like neighbor British airline Virgin Atlantic. It’s a major player with key partnerships with other major players, but it’s not a part of any of the big alliances, though it was formerly with oneworld.