I've had the opportunity to fly frequently to many airports in Brazil. During Carnival it's chaotic at GIG or SDU. I can imagine the airports being much more chaotic, but I am not sure what the airports are planning to do. I imagine more taxi's available to limit the lines for the taxi which are very very long.
If you've ever been to SDU in what I call the "bus" terminal in spite of not remembering the actual terminal number you know what I am talking about. Maybe 10 gates where we are all waiting for buses to take you to the plane, and it's difficult to even move around or find out what's happening with you flight.
Kiosks sometimes are not working.
During busy seasons, I've seen a 3 hour lineup just at the check in counter for Gol in Belo Horizonte.
Lack of quality of food inside security at most airports (ok, now this one is a just a personal complaint )
This will be interesting. I am sure it can be pulled off, but I wonder what the airports and airlines are going to do to mitigate these problems for the large volume of people.