Ther's no better way to kill time in an airport than watching and eavesdropping. Americans are fascinating.
First, Americans are chatty. They are not the least shy about sharing personal information.
Do you want to know their family background, job, relationship with loved ones, medical details, or their opinions on just about anything? They'll tell you, unafraid to divulge virtually you want to know. The concept of reserve around strangers seems to be unknown.
I've heard it said that you can tell an American by their free and easy walk. That may be true, but even more characteristic is the engaging informality that melts the barriers between strangers.