A masterpiece in modern cinema. Paul Greengrass directs such a realistic account of 9/11 told in almost real time. The last 30 minutes are so frustrating as even though we know the outcome you can't help but will the passengers on to take back control of the aircraft. It never fails to bring a tear to my eye as those poor souls on board faced true terror. What is interesting is that although the terrorists are of course bad, their portrayal is given a layer of humanity. It's almost as if they had no choice but to conduct some heinous acts which changed the course of the modern world. The editing is also very good.