This may sound like a silly question but, I will be travelling London to Buenos Aires via Sao Paulo next week (on BA - so I hope I do travel in the end!). I will have to change aircraft (and airline - Varig) in Guarulhos Airport. I will only have I think 1.5 hours to transit from Terminal 1 to Terminal 2. Do I have to pass through Brazilian immigration? Will I have enough time or should I change my travel arrangments and get a later flight? Also, if anyone knows, is it safe to check my luggage through to Buenos Aires?