Re: Wait, Wut?
Well, it's been a while since this happened, but Rio is a pretty humid place, particularly in the wet season. I speculate that sitting with the doors open and the aircon running, and the condensate not being drained where it should have been, caused the issue.
Air France were terribly good/embarrassed about it. And at least it wasn't AF47 that time, which we'd flown *to* Rio on the day before it failed to find its way home. :(