It is not too soon for "United 93," because it is not a film that knows any time has passed since 9/11. The entire story, every detail, is told in the present tense. We know what they know when they know it, and nothing else. Nothing about Al Qaeda, nothing about Osama bin Laden, nothing about Afghanistan or Iraq, only events as they unfold. This is a masterful and heartbreaking film, and it does honor to the memory of the victims. The director, Paul Greengrass, makes a deliberate effort to stay away from recognizable actors, and there is no attempt...