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PORTLAND -- Oregon Air National Guard fighter jets were called up Thursday night to escort an Alaska Airlines flight into Sea-Tac after a telephone hijack threat.

Flight 819 originated in Kona, Hawaii. The Honolulu FBI office received a tip a passenger on board the plane was planning to hijack the flight.

NORAD scrambled fighter jets from the Portland Air Base. They flew alongside the aircraft until it landed in Seattle about 7 p.m.

FBI agents and the Port of Seattle police escorted a man off the plane without incident and detained him for questioning for two hours, said agency spokeswoman Ayn Dietrich. He was cooperative during the questioning and Dietrich said the FBI was not anticipating an arrest.

I can tell you any threats or tips we receive we take seriously in case they're a credible threat, she said. We certainly get a number of calls that turn out to be not credible.

According to NBC sources, the man had slept through most of the flight and the crew on board said nothing out of the ordinary happened during the flight and they were never in any danger.

Some passengers said they didn't know anything was happening until the plane stopped before the terminal to let police and FBI officials on board.

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