This requires very skilled pilots and good communication between them.

It is a high-risk job that requires very skilled pilots.

At the time of the crash, there were no Federal rules requiring pilots to take any drug or alcohol tests.

Still, the Canadian route requires expensive airplanes and experienced pilots.

Any flight restriction requiring pilots to fly higher would mean the approach to the airport would have to be changed.

The officials said the flights would require pilots to sweep at low altitude over northern Iraq looking for groups of refugees.

All robots in the show are sentient and do not require pilots.

Its recommendations included requiring pilots to make themselves more conspicuous when using an active runway by turning on all their lights.

Federal air regulations require pilots who stray off course to promptly notify air-traffic controllers.