>Now, there is only one thing that the F-16s could have done in this situation. Either they do nothing, or they shoot down the plane.<p>Utter BS. Before it comes to killing, the escort fighters usually show to the plane being escorted where to go. They do it using radio, visually (pilot's hands, overall fighter maneuvering and rolling), and if it comes to it - using tracer rounds. After the escorted plane refuse to follow the commands ... and continue flying toward DC ... in the post 9/11 world the kill would seem like a publicly acceptable outcome.