Originally Posted by
BillyBleach
No what he means is if after adding your BA number to the AA flight it doesn't appear on your boarding pass, go to an agent at the airport to manually add it prior to your flight.
In the event TP's don't post to your BA account (quite rare), you can file a back claim with BA (assuming you had your BA number on the booking when you flew. BA may ask for proof.
Sorry I wasn't clearer but that is what I meant. The retroactive fix can be done but is much more hassle. In the case I mentioned I finally got it fixed in the FL at ORD after flying MSN-ORD. The agent at check-in tried to change from AA to BA but didn't reprint the BP. I checked online at the gate, found my BA number wasn't showing and the agent there tried to change it but also didn't reprint the BP. The FL agent fixed it easily, including the first segment since it hadn't posted yet. This is why it's good to have the correct FFN number printed on a BP just in case!