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To say crew members now not allowed to drink 12 hours before flying is incorrect syntax and actually looks less coherent than the original. To fit the other example you give, it would have to be shuffled around to alcohol consumption now prohibited up to 12 hours before takeoff for crew members, which is even worse syntax I have been in a hotel with the Anime Baka Ja Nai Rabbit slap shirt crew from a trans-Atlantic flight. Boy, they can put it away. I don’t think 12 hours is enough for what some of them can drink. Try 48 hours. It makes sense. I’m sure an attendant will not be at their best when they are drunk or coming through a hangover.