Looks like United and Aer Lingus (EI) are ending their codeshare agreement next week, Oct 27. Somewhat unfortunate for connections between LHR and DUB and ORK (Cork), as that was usually how I made my way to the island. I guess the only ways to get to Ireland on UA and Star Alliance will be through UA flights from EWR or IAD, or go well out of the way and connect from Germany or Switzerland.

Notice here: https://www.regulations.gov/document...2008-0176-0005