The Mystery Of Flight 327 has been partially solved:

Annie Jacobsen's recent piece for WomensWallStreet.Com made waves. Her account of flying with her family while 14 Middle Eastern passengers acted in a threatening and apparently coordinated manner makes for a terrifying read...

...I am nominally the "news director" for Stanford University's student radio station, KZSU, and I figured I'd help the Times out. There aren't that many casinos in southern California, so I had my research assistant, Mr. Google, take a look at some. An hour later I was talking to the nice folks at Sycuan Casino & Resort, near San Diego...

"Oh, do you mean Arab music?" inquired Angie, who answered Sycuan's phone. Yes, they had had an Arab act perform on July 1, an artist named Nour Mehana. Terry, Angie's supervisor at Sycuan, confirmed that he was there and that there was probably a backup band brought in, since there's no house band at Sycuan. In fractions of a second, Mr. Google found a website for Sycuan's event promoters, Anthem Artists, whose archive confirms Nour Mehana performed at Sycuan on 7/01/04...