It's always a strange place to draw the line. Like you're admitting that you think that the powers that be are evil enough to plot, plan, facilitate, and/or allow through inaction two skyscrapers coming down in the middle of the country's largest city for the sake of broader global agitation goals, but using real planes full of Real Americans to achieve this is a step too far and Too Evil for the Proud American Empire, so it must have been drones or CGI or a missile with wings.