The controller clears the command-ready bit once everything is over, it clears error bit to show successful operation and reset busy bit (0).

The second controller, who had responsibility for the airspace in question, had cleared the United plane to the same altitude.

The controller then cleared them to switch to the airport's frequency, which was acknowledged by the first officer.

According to the BBC, the controller cleared the A-10 to enter the area, saying that no allied forces were within two miles.

Currently, if a controller clears a plane to taxi a runway, the pilot is allowed to cross all runways in between.

Despite all this confusion, the controller again cleared MetroJet 2998 for take off on Runway 5R.

The crew was cleared for a visual approach to Runway 19R while the controller had cleared another flight to take off from 19R.

At that time, the controller cleared the flight to use the localizer back course approach for runway 25, to circle to runway 3, or to land straight in.

The local controller then cleared US1493 to land on 24L, with SkyWest 5569 still holding in takeoff position on the runway.

Before controllers cleared the Boeing 727 to take off on Runway 3C-21C, they asked the DC-9 where it was.