Do you know what never ceases to amaze me? Baggage claim. All of those bags sitting there! And you can just take one! And nobody checks which one you take! Or if you take the right number! Or if you were even on a flight!
I don’t know about other big airports, but I flew and and out of Atlanta many times over the 14+ years I lived there, and even before 9/11 changed everything, I had to demonstrate that the bags I was leaving with were mine before I could exit baggage claim.