I agree with 123, GRU
depends on the hour. The best hours AFAIK are early morning to around 10 AM
, and after 7 or 8 PM
, that's when you catch most of the intercontinental flights. On the other hand, at any time of the day you will see tons of Brazilian planes, and with some luck even one of our gorgeous Plunas!
As for the material side of the airport, well, you can find great spotting locations, but you'll have to walk for them. And again, 123's right, I hope you're not hungry when you get there, because a sandwich is all you'll be able to find.
I dunno about the 3 hours thing. I would say that if you fly there late in the evening you've got enough time to see loads of interesting planes, so good luck!