Messer waren auch bei anderen Flugzeugen unter den Sitzen festgeklebt,
Woher die unter die Sitze geklebten Messer in den anderen Flugzeugen stammen ist nicht geklärt.
Es deutet aber auf Helfer hin, falls man den Terroristen ihre Messer weggenommen hätte..
Es deutet auch auf Backup-Flugzeuge hin, für den Fall, dass die ursprünglich geplanten Flüge keinen Erfolg gehabt hätten.
Guardian reported, that knives of the same type used in the successful hijackings were found taped to the backs of fold-down trays on a Continental Airlines flight from Newark.
Knives and box cutters were found on two separate canceled Delta Airlines planes later that day, one leaving Atlanta for Brussels and the other leaving from Boston. (Time, 9/22/01, Independent, 9/25/01)
On September 14, two knives were found on an Air Canada flight that would have flown to New York on 9/11 if not for the air ban. (CNN, 10/15/01)
According to Chicago Tribune, another "box cutter knife was found" under a seat cushion on American Airlines Flight 160, a 767 that would have flown from San Diego to New York.
There was indeed a Flight 160, but once again, no wheels-off time.
The plane was scheduled to depart at 8:05 AM.
http://inn.globalfreepress.com/modules/news/article.php?storyid=1074
Knives and box cutters were found on two separate canceled Delta Airlines planes later that day, one leaving Atlanta for Brussels and the other leaving from Boston. [Time, 9/22/2001; Independent, 9/25/2001]
bullet On September 14, two knives were found on an Air Canada flight that would have flown to New York on 9/11 if not for the air ban. [CNN, 10/15/2001]
http://www.cooperativeresearch.org/context.jsp?item=a900dispatcherwarning