As he watched, a plane slammed into the other tower.

He followed others down the stairs and reached the 60th floor when the second plane slammed into the south tower above them.

Witnesses said the engines were sputtering before the plane slammed into the building on Friday.

The plane rolled to the right, nose down and slammed into the ground.

One, a 23-month-old boy, died after his mother lost her grip on him as the plane slammed into the runway.

All he could do was watch as the plane slammed directly into the restaurant and set the summit ablaze.

A split second later, the plane slammed into the British military command post and the entrance to their living quarters.

The plane slammed into the north face of 1 World Trade Center.

Whoa," he added, as the plane slammed through an air pocket.

The plane slammed into the side of the mountain, killing all the passengers instantly.