Air traffic controllers direct air traffic within assigned airspace, and control moving aircraft and service vehicles at airports. Flight service specialists provide pilots with flight information essential to aviation safety. Flight dispatchers authorize airline flights over assigned routes.

• Air traffic controllers
  
• Control flow of air traffic within assigned airspace using radar monitors, radio and other communication equipment and visual references
  
• Issue aircraft takeoff and landing instructions to pilots and relay meteorological, navigational and other information to pilots in flight
  
• Maintain radio and telephone contact with adjacent control towers, terminal control units and other area control centres, and co-ordinate movement of aircraft into adjoining areas
  
• Alert airport emergency services when aircraft are experiencing difficulties and report missing aircraft to search and rescue services
  
• Direct activities of all moving aircraft and service vehicles on or near airport runways.
  
• Flight service specialists
  
• Provide pre-flight information concerning current and forecast weather conditions, radio frequencies, terrain, airports and related data to assist pilots in preparation of flight plans
  
• Check flight plans for completeness and accuracy and forward flight plans to air traffic services facility
  
• Respond to radio calls from aircraft preparing for takeoff or landing and supply information such as weather conditions, wind speed and direction and presence of local air traffic
  
• Support air traffic control operations by relaying radio requests for flight clearances, arrival and departure information and position reports
  
• Alert airport emergency services of aircraft experiencing difficulties and initiate communication searches when aircraft become overdue
  
• Observe, record and report weather conditions at airports.
  
• Flight dispatchers
  
• Analyze environmental conditions and assess aircraft for load and fuel capacity and other factors to determine flight routes
  
• Brief flight crew before takeoff on weather conditions, status of navigational facilities and airports en route
  
• Co-sign flight authorization with aircraft captain
  
• Monitor progress of flight and communicate as required with aircraft during flight
  
• Delay or cancel flights if conditions warrant
  
• Prepare and maintain flight plans, flight logs and other reports.
  

Air Traffic Control Chief
Air Traffic Controller
Flight Dispatcher
Flight Service Specialist
Tower Controller, Air Traffic