I too always wonder what people are talking about. I suppose this is because I consider myself to be a low maintenance flyer who just gets on with it and only speaks/seeks assistance if absolutely necessary or if there is a problem, but I imagine others are more sociable
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Similarly I also often wonder what people at check in are doing. When I check in bags it usually takes me two minutes, but I often see persons spending ages at the check in desk seemingly engaged in lengthy and sometimes animated conversation and it makes me speculate what on earth they are talking about. Checking in should be a quick and straightforward process.