Continuity mistake: At the end, during the fight scenes in the first class cabin, the number of overhead compartment doors that are open changes.

United 93 (2006)
Plot summary
Directed by: Paul Greengrass
Starring: Olivia Thirlby, David Alan Basche, Gary Commock, J.J. Johnson, Liza Colon-Zayas, Opal Alladin, Polly Adams
On September 11, 2001, four young Arabians prepared themselves for hijacking United Flight 93. The same day, America witnessed three attacks, as one plane destroyed the Pentagon and two others, destroyed both towers of the World Trade Center. The FAA and Military are unprepared for this and battle to deal with the situation. A delay of United 93 allows the passengers to learn of the attacks, which leads them to believe that they too are part of a hijacking and must stop the terrorists, in order to saves thousands of lives.
jezzy t
Honor Elizabeth Wainio: Hi, Mom, it's me. I'm on the plane that's been hijacked. I'm just calling to tell you that I love you, and goodbye. This really kind woman handed me the phone and she said to call you.
Trivia: Families of the 40 passengers and crew members killed on United Flight 93 cooperated in the production, offering Greengrass detailed background about their loved ones, down to the clothes they wore, what reading materials or music they had with them and what sort of candy they might have snacked on aboard the plane.
Question: How come the terrorists' knives were not noticed? Airports have metal detectors designed to detect knives.
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Answer: At the time of the 9/11 incident, certain type utility or pocket knives like the ones the terrorists brought on board were not illegal. Airport screeners had more leeway then about what type of knives, tools, or other gadgets they allowed passengers to carry on board. Since then, the restrictions are far more stringent.
raywest ★
I can attest to this as my father traveled on aircraft with his pocket knife multiple times before 9/11. As long as it was under a few inches; it was more viewed as a tool than a threat to the aircraft.