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.
Trivia: The FAA National Operations Manager, Ben Sliney, was played by himself. September 11/2001 was also his first day on the job.
Answer: Muslims are supposed to remove their pubic and armpit hair at least every 40 days. It is part of being clean and they would want to be as clean as possible while committing an act on behalf of their religion.
Myridon