As someone who flies JJ much due to regular flights to Brasil and who has pooled his miles into *A via United, TAM joining OW is really an unknown but potentially huge blow. First, won't get the 3 bags per person now that I'll be flying a different alliance once in Brasil though I guess that won't be such a big deal. Second, saved so much money booking through JJ when flying UA metal. Third, miles won't get me to my final destinations now. This news appears to be a big disappointment...