neighbour. Now it's common to ignore everyone else, so people take to drinking and the like, and misbehave when they get drunk.
Personally, I think the majority of the problem is due to the big delay between when you HAVE to be at the airport to check in through securefarce and the when you board - it gives people way too much time with nothing to do due to the very restricted recreational facilities on that side of the securefarce barrier and the only thing many can do is sit in the bar drinking; if they're lucky they get to talk to someone as well, and thus reduce the liquor intact. The hour or more wait in the bar means many people are drunk or half gone before they board, and it doesn't take much to finish them off afterwards.
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