This is amazing news, just got this to my inbox. Azul has a ton of flight option, though tam is more convenient for connections.
"Connect to more than 100 cities throughout Brazil with Azul Brazilian Airlines, our newest MileagePlus partner. Starting April 1, 2014, you can earn or use MileagePlus miles across Azul's network, the third largest in Brazil.
Whether you're traveling to Brazil for business or pleasure, you can get there with MileagePlus and Azul. We'll look forward to serving you.
Special note: As previously announced, our partnership with TAM Airlines will end on March 30, 2014. As a result, after this date, MileagePlus members will be unable to earn and redeem miles for travel on TAM Airlines. Award tickets issued on or before March 30, 2014, will continue to be honored by TAM Airlines and are valid for one year from the original date of issue."