Nunki
Well, the restrictions were put in place on September 2nd, no more night flights and limits on operations in low visiblity, although nobody I've spoken to has any real idea why. GOL are worse affected, and they have cancelled their early morning flight.
There doesn't seem to be any real reason behind this. Perhaps someone rich and influential doesn't want their beauty sleep interrupted and had a quick word with "friends in high places".
Alemaobaiano