This movie does not disrespect 9-11 in any way. I am actually of the opposite opinion in that it reinforces the "never forget" mantra that every patriotic citizen should keep at the forefront of their mind until we are truly secure. And most experts agree that we are not truly secure yet. Ok, ... now a little about the movie.
First, it does a fantastic job of combining documentary and speculative elements into a movie of extreme intensity. From a technical perspective it highlights the huge holes in our information sharing. For those of us who struggled (and still struggle) to get information sharing off the ground ... beware, that you may leave the movie theater pissed off.
This movie does everything right. You are left drained after it. The second half of the movie is heart-pounding and gut-wrenching. You truly believe you are on that flight... I will definitely be buying this one.