Airports are the worst.
They always seem frenetically odd and super tense to me, especially since 9/11. Just a weird place (it becomes less foreign the more you fly though), especially when you're not there just to see someone off.
Not a ton of diversity, either. I usually see less than 8-10% (depending on the airport) minorities who are flying. Workers are usually black.
However, outside of a major event or visiting a major city, you probably won't see such a high of a concentration of aesthetically pleasing, upper tier chicks anywhere else. And that's of all races, ethnicity.
The difference between folks who travel via air versus train and bus are night and day.

If you've traveled by bus and/or train often (or even occasionally) you'll immediately notice that you're in a strikingly foreign, different element with different clientele that bears little resemblance to bus and train clientele.
All told, you wanna make your airport experience as easy as possible. Just getting on the plane is an ordeal in and of itself.
Other posters have already provided the basics for you.
Oh, and on international flights & flights outside the continental U.S., be especially vigilant and alert as you always should.
So how did it go?