The best part is this does zero. We all know that.
Things come in with the "service" people, baggage handlers, the people that refuel and inspect the plane. The folk that bring the food. All of these folk are real easy to bring something in. It has happened several times with baggage handlers getting nailed for shipping guns here there and yon. All the while you must take off your shoes. Total bullshit that really does nothing at fucking all.