Just got word from Aer Lingus that they're moving from T5 to T3 at O'Hare:
This terminal offers you an enhanced retail, and restaurant experience and includes access for eligible customers to
The American Airlines Flagship Lounge – just a five-minute walk away from our boarding gates in Concourses H/K.
Since I'm flying Business Class from O'Hare in April, this makes me happy. The T5 Swissport lounge that AL used was pretty bad, according to reviews and photos I've seen, so I wasn't planning to use that one at all.