Originally Posted by
madfish
You also earn more avios on BA codes than the same flight with an AA code.
In theory you can also book an AA fare by calling BA and thereby earning the 3x avios by using your Amex.
This is also true but I suppose the limiting factor with that is that BA wont allow two BA Coded AA flights intra USA so if you take JFK - LAX on a transcon on BA Codes you cant then do LAX to HNL with BA Codes so there are limitations, Just trying to balance what is the most "Optimal" that and no one seems to know anything about IB in the USA its a mystery haha