In addition to police help and helicopters, the British controller can call on a network or volunteer mountain rescue teams in the region at any time.

Any controller may call for an abort if the circumstances require it.

At that moment, the controller called.

A few minutes later, when they were less than twenty miles from the DMZ, the controller called, "Linear."

A mouse-related controller called the SpaceBall has a ball placed above the work surface that can easily be gripped.

The on-board controllers were calling for help.

In case one refuses to show documents controllers can call the police to wait on the nearest stop in order to verify one's identity.

This is tricky because controllers sometimes call on planes in flight to change their transponder settings.

When the controller called KZA1907 again, he received no reply.

The controllers have called a couple of senior instructors into the tower to coach her down.