Next came a drone plane, to be set in motion above the Citadel.

"But if you're using unmanned drone planes, how do you expect to map the deposits?"

Then he watched the little drone plane take off from the airfield.

The same enemy had engineered the theft of both the old book and the drone plane.

Several small drone planes were circling in the blue.

After that the bomb run would be made by a drone plane.

A drone plane had been flown to the lake with a television camera transmitting back everything its lens saw.

I'm taking a drone plane along on our trip for a test run.

They followed him to the trailer on which the drone plane rested.

"I'm sure that there won't be any trouble setting the other drone planes in flight when they arrive."