11.   That put an end to speculation whether the first crash had been an accident or terrorism.

12.   The first major crash of the year has proven particularly embarrassing for the agency.

13.   The first crash was attributed to pilot error.

14.   The first crash involving the D model came less than three years after the Boeing memo.

15.   Then, less than three years after the Boeing memo, came the first crash involving a D model.

16.   They had called their co-workers to tell them they were escaping to the roof after they realized the extent of the fire caused by the first plane crash.

17.   Twenty minutes later, he heard on the car radio about the first plane crash and got to Manhattan to see the second tower being hit.

18.   With TV cameras still focused on the first crash, a second plane crashed into the tower.

19.   A U.N. engineering team was to go to the site of the first plane crash on Tuesday to excavate it, U.N. spokesman Fred Eckhard said in New York.

20.   Company officials said it was the first crash involving this type of plane.