Zurich departures
Further to T. Buchanan's comments, please note that the Zurich departures in question do not imply a 360° turn. It's simply a noise abatement issue and westbound traffic on the southbound runways are not allowed to turn right. So they turn left and turn overhead, which is a 270° turn. It has nothing to do with mountains, Zurich is not "surrounded" by mountains as one of you guys has claimed. To Swiss standards, Zurich is flat terrain.