There's an RCC in the terminal UA uses but given AC's recent move to T2 not sure there's anything. The airport has the worst most useless website of any major airport I have come across so can't determine much from it.
Seems AC now has downgraded gates at four US airports leaving lounge access problematic at each: DCA, SAN, BOS and LAS.
BTW could OP please edit the thread title so it makes some semblance of sense?