The only moral issue I see here is "judge not lest ye be judged." That's how I saw Boomer's hope-you-miss-a-flight post. I have tendencies to prejudge, too: at two of the three airlines I use out of BOS, when a flight is about to close, the wanderers call out "anyone for XXX on flight YYY come to the front," and I see people from all parts of the line coalesce in front, and I do sort of get steamed at those who have just arrived who zoom to the front. But I have to realize that they have their reasons, and the reasons are not always pure laziness or negligence.
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The Cat's suggestion is good, but I wonder if the express line won't end up getting misused as well. To set up a 30-min line runs the risk of people relying on it, and then what would happen if that line got really long?