Originally Posted by
qfrodo
SoCal,
Given that the OP is arriving at GRU domestically, the only thing I would change in this sentence,
Remember, even if your bags are transferred you will almost certainly have to go to UA at GRU to get your boarding pass.,
is to take out the word "almost".
That's what I thought, but I was basing it on my own exprience and so didn't want to make a sweeping generality. They'll still have to find out whether they're bags will be transferred (wouldn't want to walk by the baggage carousel and leave the secure area and miss their bags).