'We didn't shoot it down because we didn't want to kill everyone on board plus those down below and we didn't think it was likely it was another 9/11 so the crash into central London which killed several thousand people rather then the 300 if we'd shot it down was unfortunate.....'
Load Toad - i get where you're coming from but it's a damned if you do, damned if you don't situation - before 9/11 it might have seemed impossible, sadly now that's no longer the case.