I will be flying Club from the US to LHR in a few months on an Avios Ticket. While my BA status is Blue, I’m AA Platinum, meaning I’m OneWorld Sapphire. My understanding is that entitles me to free seat assignments, but how do I get my AA Platinum # into my Avios reservation information?
I've heard that you can input your booking reference into Finnair's website and change it there, but it doesn't always work for me. I would just call British Airways and ask them. It takes a matter of seconds.