I don't know much about the 9/11 incident, but I only know that the World Trade Center was hit by a plane. I thought the movie was also about this incident, but it wasn't.
The main line is not clear, and the background of the story is not clear. Before the hijacking of Flight 93, the plot was quite messy, I was at a loss when I watched it, and the main line of the movie was gradually clear only halfway through the movie. It was really touching that the passengers came together to fight the terrorists after the hijacking, but unfortunately the plane didn't land safely in the end. It is only after experiencing turmoil that we know how precious peace is.
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