ADB-B receiver + cheap drones with simple homing software = total shutdown of US air traffic. I think $20,000 is probably an overestimation of what it would take. There&#x27;s a lot of asymmetric situations starting to &quot;mature&quot; and defense side is way behind since they&#x27;re using them to exploit the populace. It&#x27;s not just a &quot;cyber&quot; problem.