They did it everytime for two weeks in January. If the winds are neutral (calm) to favorable (headwind) it is their choice. Probably saves fuel as you get a normal climbout and a right 180ish turn enroute to Paris. Taking off towards the mountain requires an immediate climbing right turn and then either a left S turn to Paris or 3-3.5 more right turns (270ish) to get on course to Paris.