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A box cutter found by a passenger on a United Airlines plane delayed a flight from Denver to Dallas for nearly two hours.

Federal officials met the plane on the tarmac, re-screened all the passengers and searched the aircraft. Flight 490 was taxiing toward a runway at about 12:30 p.m. Tuesday when the passenger found the cutting tool.

Terrorists used box cutters as weapons to hijack planes on September 11, 2001.

Transportation Security Administration officials say there are more layers of security now than in 2001, including armed pilots and armed federal marshals.

United Airlines spokeswoman Megan McCarthy declined to speculate about how the box cutter ended up on the airplane.