He has frequently attacked formations of hostile aircraft and driven them down.

"It would have been irresponsible of him to come back, pounding his chest, when hostile aircraft may be headed our way," the official said.

Quickly, he checked the sky around his Tomcat, but it was empty of hostile aircraft.

I understood that to mean protecting them from hostile aircraft.

He has previously done fine work against hostile aircraft.

This was the result of the missile design flaw in identifying hostile aircraft.

In addition, he has three hostile aircraft and one balloon to his credit.

It was my job to convey the order from the vice president to shoot down hostile aircraft.

At 10:51, the conclusion was reached that the plane was a hostile aircraft.

On the morning of the 11 April 1917, while escorting our bombing machines, he brought down three hostile aircraft.