Originally Posted by
mrisoli
Thank you very much! Looks like I'll be going with AA,
As for mileage runs I am still doing lots of research
Just a word of caution: When you actually use AA metal to anywhere in the world from your home airport you have to connect in the US. The US does not allow transits but makes all incoming passengers pass through immigrations and customs. Assuming you're a Brazilian citizen, you'll need a $160 visum and have to endure the long lines at immigration...
I only started to use AA from Europe to South America via the US after I got Global Entry/PreCheck and could get around the horrendous lines. Your tolerance may be higher (I'm not that young anymore, and my backpacking days are pretty much history), but MIA immigration lines at 6am when all the SouthAmerica flights arrive is definitely not a pretty place to be.