BA scheme is better if you regularly fly premium (Elite status is very Tier Point based which focuses on F and J travel).
AA scheme is better if you regularly fly discounted economy as it is miles and sector/no of flight based.
We really need to know your travel patterns when earning and redeeming..
Also, BA FF scheme charges fuel surcharges on miles redemption (even if you are redeeming on AA or IB) which only makes sense to redeem in J or F. AA's FF scheme does not and is useful for redeeming in Y. Also AA gives Upgrade vouchers which BA does not.
AA Platinum (OW Sapphire) will get you into the BA's Galleries lounges. You can check in at business class desk. Not sure if you can access LHR T5 FastTrack Security Lane.
BA does not upgrade to business unless economy is oversold. Elites do not get upgrade vouchers.
Last edited by KenJohn; Oct 12, 2011 at 8:29 pm