Originally Posted by jawa912
Does this mean that I cannot use my AA miles to book a reward ticket on BA to LHR?
The only way that I know of to use AA miles to book a reward ticket on BA to LHR is to book it as a OneWorld award, and book through Canada. For instance, book AA from U.S.-Canada, BA Canada-LHR, and another OneWorld partner (Finnair, Iberia, or EI) somewhere in the trip.