With all the hoopla behind the merger of US Airways and American Airlines on 3/31, it was easy to miss TAM's exit from the Star Alliance into Oneworld. Normally, this wouldn't be such a big deal to me, but recently, TAM has taken it upon itself to release award availability for just about every single first class flight from JFK to Sao Paulo and back for the foreseeable future.
Historically, TAM has been notoriously stingy about releasing first class space, so this is a really surprising turn of events. Several other bloggers have theorized that this might be a glitch in the system because of TAM's merger with LAN and subsequent transfer to Oneworld. Who knows? What I do know is not to look a gift horse in the mouth!
Unfortunately, before the merger, you were able to book TAM with any Star Alliance partner miles as well as American miles, but now as a Oneworld partner, you can only book with miles from that alliance. As British Airways Avios points and American miles are the most popular mileage currency in the US, I'd assume you'd use one of the two. Personally, I think the best value is to book with American miles for 67,500 miles each way. Not only will you be able to travel in luxury to/from New York to Sao Paulo, but you can choose to either to add another segment to get to your final destination (or start somewhere other than JFK) for free. Or if you live in New York, you can take advantage of American's free one-way segments on international flights before or after your trip back from Brazil.
Like most great deals in the travel game, this will not stick around forever… although I'm frankly amazed at how it's been going strong for over a month. Get in while you can!