I am flying from SJO to ASU via Panama City and Sao Paulo. My flight into Sao Paulo is on Copa, and my flight to Asuncion is on TAM. I confirmed that they have an agreement that allows luggage to be through checked to Asuncion. However, the airlines are located in two separate terminals at GRU. I have read a lot of people mentioning that if you stay in the transfer lounge and avoid immigrations, you should be fine. But are you able to get from Terminal 1 to Terminal 2 from the transfer lounge?? I realize that the second I step outside of the terminal, all is lost. Is my Paraguayan visa and onward ticket enough to get me through unscathed?