BoeingBus (Reply 3):
Try BRA to travel inside Brasil (www.voebra.com.br). Just as a piece of additional info, they were until recently a 100% charter airline and their entire fleet is made up of ex-RG
aircraft, which is in itself a plus since they are all in very good shape.
They fly from Sao Paulo to more than a dozen cities and just to give you an idea, you can fly to Salvador, Bahia, for as low as R$ 99,00 ( approx US$ 42).
I live in Sao Paulo so should you decide to spend a few hours/days around here let me know!