If you're talking about DUB-CLT on 8/1, that's being operated by N780AN and tonight it's going CLT-DUB. The flight search shows a wifi symbol. It doesn't show up when I search DUB-CLT on 8/1, likely because it's sold out.
That being said, I've learned not to rely on satellite wifi over the ocean too heavily. It can be slow at times and spotty coverage.
Yes I am on AA725 tomorrow and when I look at my booking on the app or website, or if I look at flight status, the wifi symbol is not there, even though it was there yesterday (and shows for AA785 today and on Weds). Very strange!