Let say that Nationalguard F-16s had been able to engage American Airlines Flight 11, and had fired upon it over down town New York preventing it from hitting WTC, but having it insteed hitting a busy New York street, settings shops, car on fire.
Meanwhile the passengers and crew of Flight 93 are able to regain control of their plane over the skys of Pensylvania and are able to land it, but the third a final plane still hits the Pentagon in DC.
What kind of 911 would that have given us? And what about the aftermath?
/Fred