There are ever more checkpoints, ever more requests for documents as you make your way from the airport entrance to the airplane. Passengers adapt to the new changes as they come. But my latest flight to Mexico, originating in Atlanta, presented all passengers with something I had never seen before.

We had already been through boarding pass checks, passport checks, scanners, and pat downs. At the gate, each passenger had already had their tickets scanned and we were all walking on the jet bridge to board. It's at this point that most people assume that it is all done: finally we can enjoy some sense of normalcy.