United 93

What does this film, which portrays the events of 9/11/2001 tell us about the responsibilities, training and level of professionalism of the air-traffic controllers involved? How does the film portray uncertainty and lack of information and its effect on the involved people? How does it show the difficulty involved in overcoming assumptions people bring with them as they come to terms with unique events unfolding in real time? How did knowledge of the history of airline hijackings prevent people from realizing these were going to be suicide attacks? What reaction to national tragedy do films such as this typify, and how do they contrast to other darker conspiratorial reactions? How does the portrayal of courage in the face of death play out in terms of the passengers and hijackers? How does this film compare with other films and documentaries that involve the events of 9/11?