I'm AA platinum. Just booked award flights on AA for my family using my BA miles . Was able to chose seats through BA for the flights (as a OW Sapphire) but was not able to get "preferred" seats as it was through BA and not through AA. I do have the AA PNRs, but they are not linked to my AAdvantage # as the flights were booked using my BA Executive miles (pre-Avios). Would I be able to select the preferred seats if I call up the Plat desk and have them link the flights to my AAdvantage #?