A plane ticket was never a security credential. Anyone could buy a cheap refundable fare, walk to the gate, and cancel it from the food court. What the ticket requirement actually did for 25 years was ration checkpoint capacity. TSA just confirmed it. The new Gateside program lets people with no flight clear security to eat, shop, and meet arrivals at 13 airports. Visitors go through the exact same screening as passengers. The threat model didn't change at all. What changed is where it…