AA flies from ORD to Chennai, India through LHR. Only one leg (the first one) is on an AA plane so with my Gold Status i can get an exit row at ticketing with no problem. My problem is the other three legs are with British Airways and the site wont let me secure a exit row when I buy my ticket. I am 6'3" and cannot sit in a regular seat and cannot swing the $$ for bus. class. Help !