From an updated AP article:
"...Television station KSTP in Minneapolis, where Northwest Airlines is based, quoted an unnamed source as saying the men were "shaving themselves clean." A source speaking on condition of anonymity told The Associated Press that people aboard the airplane gave early-arriving investigators similar accounts.
After last year's terror attacks, documents taken from the luggage of attack leader Mohamed Atta gave what appeared to be instructions for the suicide hijackers: "The previous night, shave the extra hair from the body (and) pray."
The plane's pilots opted themselves to land at Fort Smith rather than continue the flight..."
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Hmmm, wonder if they will claim they thought they were going on the LAS Hajj?