Originally Posted by
ridefar
Since AC doesn’t fly TPA-SFO it is almost certainly just an issue with not being able to check in for a UA flight with AC. His friend needs to check in with the operating carrier.
True, I find United funny with code shared AC booked flights. I usually get a non-boarding pass when I check in T-24 as they need to see my passport/Nexus before I can receive my actual boarding pass. When I am on a sole united flight within the USA, I have no issues!