Thanks all for the info, so it should be counter check-in no matter which airline. I got check-in prompts this morning from the AS and DL apps, but I assume that'd be a standby check in. Won't do anything until I arrive in SFO anyway.

@ddagencylv, one of the best things about flying to the US from DUB is that customs and border controls are cleared pre-departure in Dublin, so I arrive in SFO as a domestic pax. Will hopefully give me a bit more connection time in SFO.

@Mig, yes, the DUB-SFO route restarted last year, 3 or 4 days a week, and was a huge success, so it's now daily. DUB-LAX restarting, next month I think, after several years abeyance.

Cheers!