The film United 93 presents a difficult viewing experience, yet it serves as a tribute to the remarkable events surrounding United 93 on September 11. It recounts the actions of the passengers who bravely attempted to regain control of the flight on that day in 2001. Director Paul Greengrass effectively portrayed the disarray and fear present on September 11, showing how the military, government agencies, airlines, and the FAA reacted to the unfolding terrorist attacks. The movie requires a little patience before the intense action begins, but once it does, the suspense remains constant until its conclusion. This is not intended as an uplifting or comforting film; instead, it realistically shows the terror felt by those on board and highlights their courage in such exceptional circumstances. It’s important to witness and comprehend that day from the viewpoints of individuals striving to safeguard others.

Source on TMDB