This was just reported on FOX News:
Jet halted at LAX; two men are removed by police
September 28, 2009 | 11:19 am
A plane was stopped from taking off from Los Angeles International Airport, and two men on board were taken into custody, according to the Los Angeles Police Department.
LAPD Lt. John Romero said the men, who appeared to be of Middle Eastern descent, were acting suspiciously.
A law enforcement source said at least one of the men ran into a restroom on the plane and appeared to hide while the New York-bound jet was taxiing on the runway, according to the source, who spoke on the condition of anonymity because the case was ongoing.
http://latimesblogs.latimes.com/lanow/2009/09/authorities-halted-a-plane-from-taking-off-from-los-angeles-international-airport-and-arrested-two-men-on-board-after-they-be.html
With this being Yom Kippur and the earlier terrorist plots broken up, this is not the best time for those of middle eastern descent to act up.