What is it about airports?

Recent events brought me to question myself why is it that i insist on dropping people off and picking people up at airports. I mean, you can see the planes taking off and landing, which was the initial charm of airports and at some point in my life it was my family's favorite pastime.
But I started thinking about it more and it wasn't until I recently went to one that I realized what it was: It goes way beyond the fact that you can watch the planes and that I wanted to be a pilot when I was a kid. It's all about the people.
I love, LOVE to observe people. I sit on benches in park just to do that. I love to eavesdrop and hear the conversations they have. I love to watch their face expressions, the way they talk, their gestures, etc.... I especially love to pick people up at the airport because you can observe people waiting for their loved ones, or their friends, or their customers, etc. I observe people when they are waiting, some bring their newspapers and books and read, other bring their families and friends and engage in different type of activities: playing with the baggage carts, buying food or balloons, talk loudly about all kinds of subjects; there are some that start to run out of patience and begin to sigh, and walk from one place to the other, and there are others who play or talk with and on their cellphones.

But the height of the moment is when the expected person finally arrives: their faces light up and they smile and run towards them and they hug or shake their hands. It's a happy moment. it's always a happy moment, either because you are having a close encounter with somebody you care about or because your wait is over.