Greetings. As a first time poster, I have a question about benefits reciprocity. I am an American Airlines OneWorld Sapphire status (= BA Silver I believe). I live in London and LA so think I have the choice about which program on which to earn status. Choosing a complimentary exit row seat is important to me BUT when AA replaces (cancels) a flight to BA metal, I am NOT permitted to choose an exit row seat without paying for it. Even then, I have to go to the BA site to pay because AA tells me they do not have an accurate seating chart. If I earn Sapphire/Silver status with BA instead of with AA, does anyone know if I would be able to choose a complimentary exit row seat on AA metal in the event BA cancels a BA flight and rebooks me on AA Metal? Also, does BA Sapphire allow me to choose a complimentary exit row seat if I just book a flight directly via the BA website but the actual flight is on AA metal? I would switch/earn my Sapphire status on BA instead of AA in 2021 if they do. Thank you.