Characters as old as Maryland's College Park Airport, the most loathsome denizens of the airport are now rank-able for both your pleasure and judgment. There's that one kind of person that annoys the sh*t out of you more than others, but who are they? Those who aren't prepared to take their shoes off? The person who goes-off on TSA? That weeping baby in the back? Every single kind of person on this list does truly deserve to be on this list.
Sense of boundaries, in general, aren't exactly commonplace when you're flying, but everyone needs to band together and maybe pretend we live in a society on a planet with civilized human beings. Nobody should be able to smell any part of you at the airport. If you're about to fly, cool it on the body spray and/or perfume, shower, and only do a standard deodorization; your is to smell like fresh air, that is to say, like nothing at all. You're about to be trapped in a metal death-trap with a large number of strangers and you can only assume you're going to be the most thoughtful one (because if you do that, you will be right).
If you can avoid being every single one of these people, then you win, and so does the rest of the world. Godspeed.