Whenever I travel I always love to people watch. It’s fun to try and guess what nationality people are from. I’m sure I scream American when people look at me. The large bearded man with an Atlanta Braves hat may be the dead giveaway.
If someone was people watching you at the airport what would they be able to infer? Are you the typical “loud American”? Could they tell if you are traveling for business or pleasure? Are you acting the way that best represents your family, your country even? Get out there. Go travel. People watch. But remember people are probably watching you too.