But I still can't let you bob around on the end of a helicopter.

He looked up through the side window at the sound of a helicopter.

Now the people could hear the sound of the helicopter in the night sky.

What if one of our helicopters saw them doing it?

One of the helicopters was on a straight line to them.

She saw one of the helicopters, and it gave her an idea.

About 5,000 of the helicopters were built for commercial and military use.

This involved two weeks' full work, including the use of a helicopter.

She followed the road, hearing a change in the sound of the helicopter.

It was the third loss of an American helicopter in about a month.