9/11: In Plane Site is a documentary made in 2004 which promotes several 9/11 conspiracy theories and attempt to justify them in depth using photos and footage, mostly amateur footage, to provide evidence that the public were not presented with all the facts about the attacks by the United States government. A lot of the focus of this film is on the Pentagon attack and the images and footage presented by the media on the day.
Some of theories in the documentary have been criticized by fellow conspiracy theorists from the 9/11 truth movement (even anti-US government ones who have their own 9/11 theories). Some conspiracy theorists believe that the lack of credibility of this film undermines their own messages. The film has however been well received by much of the viewing public so approach it with an open mind.