11.   After the second plane hit the center, trading was canceled for the day by both the Big Board and Nasdaq.

12.   After the second plane hit, he and his colleagues raced for the stairs.

13.   Bush then recounted that Andrew Card Jr., his chief of staff, told him that a second plane had hit the other tower.

14.   But then the second plane hit, and a Port Authority official he knew told him that it was too dangerous and he should leave.

15.   By the time the second plane hit, Wynn had seized the helm.

16.   By the time they all got there, the second plane was approaching the south tower, and cell phones had gone dead.

17.   Fifteen minutes after the attack on the north tower, the second plane hit the south tower.

18.   From her office building, she watched the second plane hit.

19.   Glancing over, she saw the second plane slice into the World Trade Center.

20.   He called his wife to say he was OK, but he was apparently hit by debris from the impact of the second plane.