Inform pilots about nearby planes or potentially hazardous conditions, such as weather, speed and direction of wind, or visibility problems.

Issue landing and take-off authorizations or instructions.

Transfer control of departing flights to traffic control centers and accept control of arriving flights.

Provide flight path changes or directions to emergency landing fields for pilots traveling in bad weather or in emergency situations.

Alert airport emergency services in cases of emergency or when aircraft are experiencing difficulties.

Monitor or direct the movement of aircraft within an assigned air space or on the ground at airports to minimize delays and maximize safety.

Direct pilots to runways when space is available or direct them to maintain a traffic pattern until there is space for them to land.

Monitor aircraft within a specific airspace, using radar, computer equipment, or visual references.

Direct ground traffic, including taxiing aircraft, maintenance or baggage vehicles, or airport workers.

Contact pilots by radio to provide meteorological, navigational, or other information.