(from my travel agent):
There were at least FOUR. This morning, an Aer Lingus flight on its JFK-Shannon-Dublin run was stopped in Shannon due to a phoned-in bomb threat against the plane. Passengers were evacuated and those headed to Dublin were eventually reaccommodated. American Airlines Flight 55 from Manchester, England, to Chicago/O'Hare was diverted to Bangor, Maine. There was a threat against the plane, according to the Transportation Security Administration. Passengers say a man was led away from the plane in handcuffs. A US Airways flight from Phoenix to Charlotte was diverted to Oklahoma City after an air marshal subdued a passenger. And, finally, and most bizarrely, a passenger on a Continental Airlines from Buenos Aires checked a bag with dynamite in it. The dynamite was discovered when the flight landed in Houston. The passenger claimed it was a "souvenir" from a Bolivian mine. The passenger--and the dynamite--were detained and the plane continued to Newark, where it was swept again for explosives.