Originally Posted by tfizzle

What I have found is that AA will release some Bus seats 7, 5, or 3 days before if they are unsold and while you pay a change fee, you will save the BA fees in LHR. As long as your starting and ending location are the same, it is just the change fee which is far less than the LHR taxes and fees. But this is risky, but has worked 3 out of 4 times for me.