You will see fare cuts from all airlines. First example
Pappa Benito that maybe true for the rest of the world except latin America.
Last April all flights from Rio and Sao to anywhere in europe were heavily overbooked, including Varig, for many-many days.
Now with the absence of Varig (it was the biggest company in the area) I don't think there will be any price cut in the region.
El Greco
flights from Europe around Xmas
Between Dec. 20 - 28, everything seems full. On Lufthansa and Swiss, more or less only full fare business (€ 7000) is left, also my attempt to spend my miles failed. Varig can still be booked, but the last thing I want is spend the holidays on some airport because they don't fly.
El Alemán