AA Brazil-internal rewards have always been 10k one-way. There was a time when they were 25k round-trip, before the one-way awards. Using TAM or Smiles miles is a different matter. There is much more availability, and prices vary widely, from rougly 3k to 30k, or even more. I have received awards within Peru on LAN from AA for 6k. The 'oneworld and other airline award' chart has Brazil listed together with Peru, but it has simply never worked that way. Maybe there's a change coming.