"united 93" by paul greengrass is filmed in a documentary style and greengrass has done an outstanding job. the intense movie tells in real time the events that happened on the doomed united flight 93. "united 93" is haunting, not only because it showed in retrospect a traumatizing event that has shocked a nation and the world, but because the viewer knows that after 9/11 the world as we knowed it changed completely and irrevocably.