http://www.911inplanesite.com/
^ Has the best material Ive seen on the subject, Ive got the DVD and it's incredible. I don't 'buy' into every claim, nor am I a conspiracy believer by default but one specific issue, ie plane hitting Pentagon is compulsive viewing. Even the most "anti-conspiracy" minded person watching that part of the DVD surely cannot possibly believe that a 747 hit the Pentagon.
If the theatrical film is done in a documentary style, using all known facts and they don't go down the route of depicting the passengers as being Rambo's and having a typical patriotic finale then it could hit the mark, although I think they should just do a tv/discovery channel type version as I expect it may become a Hollywood "we have to make it into an appealing 2hrs for the popcorn munching public"
As for Black Hawk Down, that is a good example of a film being factually correct, It was also made approx 10 years after the event itself. I don't believe it was rushed out either, I think Ridley Scott deserves a bit more credit than that. He even used Mark Bowden as a consultant, he was the writer that wrote the official account of what happened