I often wondered why AA's flights to Belo Horizonte connected through GRU; I didn't know if it was regulatory or if there simply wasn't enough traffic to justify a separate nonstop.
There is not enough traffic to justify a daily non-stop; they can justify a non-stop three times a week. Though it is still a low-yielding market, and profits will depend on cargo.
The 777 can carry more of that, and a tag-on can do it daily, so it made more sense to have a daily 777 tag-on to increase cargo yield than three weekly 763s. Though as cargo yield dropped off, making the flight three times a week non-stop from Miami become more justified, as it would help increase passenger yield.
you think maybe they can pull a non stop flight out of MIA with a 762ER rather than 777 via GRU?
If Brazil loosened up with their air treaty, yes, I think they could pull it off (with a 763, since the low-density 762s are reserved for trans-cons and Bermuda).