Yeah, I was in Shannon, Ireland and they had a Delta flight that came in straight from Atlanta. I wanna say it was a 777, if not a 767, I'm not sure. I'm not too sure why they do this, but I just wanted to confirm that they do fly there. Possibly they can pick up more people in Dublin on the return flight home.
My posts/replies are strictly my opinion and not that of any company, organization, or Southwest Airlines.