All 126 passengers on the Alaska Airlines flight are fine; they were taken off the plane and had to be re-screened.
Investigators did not find a bomb. The FBI says the threat was not credible.
The scare began after a clerk at a bookstore at San Francisco International Airport found a letter about a bomb threat involving the flight from Seattle to Oakland.
"Policemen came aboard and took two suspects off the flight and from that point they took us to re-screen, and I will say Alaska handled it very well," said passenger Tracy Schei.
The plane is now back in service. The FBI is still trying to figure out who wrote that note.
