Flew ABZ-LHR-PHL-MCO a few days ago - BA to LHR then onwards with AA booked with BA. I don't think the bags actually made it on the LHR flight judging by the air tags but AA stuck 4 of them on the next PHL flight and randomly one went to ORD.

Anyway, AA were very good about it, their bag tracking on the app is very good and all bags arrived less than 24 hours later. The 4 bags that went via PHL had all their TSA approved locks cut by customs and border protection in PHL. Weirdly, the one that went via ORD was fine.

I've read online that TSA don't give CBP the keys to access these locks(!) so is trying to claim worthless as the airline will say CBP need to access the bags so tough luck? If i am able to claim, would BA or AA be my first point of call?