Hell is other passengers. In the airport, long lines, flight delays, and too-short connections create a world of aggravation in which irritating people are the irksome overlords. It happens on every trip: They crowd the gate, get in the way, get snippy, exhibit poor hygiene, and generally act like selfish schmucks. We usually just sigh and move on when an exasperating fellow traveler forgets his manners; but now's the time to vent. Here's my take on the rudest things people do in airports. Anything to add? Leave your thoughts in the comments.