After United 93, air travelers react to threats

FILE -This Dec. 25, 2009 file photo shows Northwest Airlines Flight 253 on the runway after arriving at Detroit Metropolitan Airport from Amsterdam. Officials say a passenger aboard the plane was trying to ignite an explosive device Friday. (AP Photo/J.P. Karas, File)

December 26, 2009 4:02:27 PM PST
They heard a pop that sounded like fireworks. They saw a glow of flame followed by a rush of smoke. And that was enough for passengers on Northwest Airlines Flight 253 to pounce.