That is certainly a very different way of dividing up a long haul division. It must make admin or crewing a nightmare....then again, obviously it works for Air France. I can only assume that it may have something to do with language or cultural specialisation, where each division is more attuned to the market needs of their own flying region. Also, dividing the flying up into measurable zones like this could be beneficial in terms of jet lag???? ie. the crew know where they are flying to and know exactly what time their body clocks should adjust to, it is a finite element....therefore eliminating adverse effects associated with zig zagging north south, east west across the globe. These are my theories anyway...would be interested to hear from an actual Air France F/A though.