ANN ARBOR, MICH. -- First came an alarming popping sound, followed by silence, and then the unmistakable smell of smoke. Passengers began to shout and scream on Northwest Airlines Flight 253 from Amsterdam.

"People were just running, and they were scared," said Veena Saigal, who turned from her seat on the Christmas Day flight and saw the fire's glow six rows back. "They were running toward the center of the plane, running to get away from the flames."

Jasper Schuringa, an Amsterdam resident, lunged toward the fire in Row 19, jumping from one side of the plane to the other and over several other passengers. He burned his fingers as he grabbed a piece of melting plastic held by Umar Farouk Abdulmutallab, the Nigerian man accused Saturday of trying to...