air traffic control

The pilot asked air-traffic control for permission to climb from 32,000 to 38,000 feet to avoid the bad weather.

The pilot had earlier called air-traffic control reporting heavy clouds and asked to move up to 38,000 feet from 32,000 feet.

The flight path remained close to the Indonesian archipelago, well within what is the normal reach of air traffic control radar.

The signal, standard on all aircraft, set off a series of alarms at air traffic control towers in the area.

That means almost all the air-traffic-control towers, the meat inspectors, the food pantries, and the research grants.