The controller had not made visual contact with the airplane, but he saw the explosion and fire that resulted from the crash.

Beginning at 8:52, the controller made repeated attempts to reach the crew of United 175.

The controller reads both potentiometers and makes sure that their signals are equal.

And the controller makes sure that the aircraft does not crash.

In this case, the controller would make no further requests and immediately inform the appropriate authorities.

A controller there was monitoring every move Flight Misha made.

Most controllers, as they themselves acknowledge, do not make good supervisors.

I just don't see the argument that a controller can make for a better experience.

He added that controllers had made numerous complaints to their superiors since September, when the new radar was first put into service.