Originally Posted by
neo_781
This brings up to me another question ... how expensive are overflight rights? and because AA flies so many flights to/from Brazil do they get a "volume" discount? If that's the case then it might be a different reason they skip Brazil.
Overflight fees for Canada are quite high. AA used to avoid Canadian air space like the plague for a while crossing the Pacific coming back from NRT right at SEA seemingly regardless whether ORD or JFK.