One of my best friends was flying on 9/11. The passengers were loaded, the door was closed and they were waiting for the runway and got the call to go back to the gate. The flight was almost empty and my friend, who was lead flight attendant, went to each person and explained that the runway was closed and they were going back to the gate but didn’t know why. There were two muslims, sitting far apart from each other and when she told each one of them, they had the exact same reaction : they both glared at her with hatred and slowly turned and looked out the window. They at no time acted like they knew each other and their reaction has stayed with her for 15 years.
I am sure she realizes that there is a good chance she is alive today because of it.