The helicopters fly for only a few hours at a time, often more than once during each day of light.

Both helicopters fly for 10 hours a day, 7 days a week.

It is not clear, thus, whether the American helicopters will fly again.

Two other people were also flown by helicopter to the hospital.

The helicopters fly out and shoot at anyone they see.

The authorities said the helicopters were not flying too low.

Do I have to get nervous when helicopters fly over?

Other shots were taken from helicopters flying over the city.

The helicopter was flying east, into the glare of low morning sun.

Three helicopters came into view and flew in formation toward their position.