About Us ⇒ What We Do

CATS is committed to providing services to commercial and general aviation from its facilities throughout Cambodia. For the services it is providing, safety is the top priority.

These services include:


Air Traffic Control

Air traffic controllers help pilots keep aircraft safely separated from other aircraft or obstacles while in flight or on the ground, ensuring safe, orderly and efficient traffic flow. Controllers maintain vertical, lateral or time separation according to strictly defined criteria.

Air traffic control services are provided in the areas where pilots fly by instruments (under instrument flight rules – IFR). Air traffic controllers work in Area Control Centres (ACC), Approach Control Units (APP) and Aerodrome Control Towers (TWR), where they are supported by an array of sophisticated systems and technology.

Area air traffic controllers coordinate the safe, efficient and orderly flow of air traffic across Cambodian airspace, called Flight Information Region (FIR), from Phnom Penh Area Control Centre (PNH ACC). Controllers track flights within their control, give pilots en-route instructions and coordinate with adjacent Air Traffic Service (ATS) units for handover of the flights.

Approach controllers handle the progress of arriving and departing aircraft with surveillance system within 30 nautical miles of the three international airports, i.e. Phnom Penh, Siem Reap and Sihanouk. Controllers align arriving aircraft down from en-route to standard instrument arrival (STAR) and then to the approach for landing, while at the same time clear departing aircraft to climb via standard instrument departure (SID) to the prospective route of flight.

CATS operates air traffic control towers at six airports, three international and three domestic. Tower controllers provide pilots approaching and departing the airports with clearances and instructions to help them maintain separation from other aircraft. They also guide and maintain separation between aircraft moving in and out on the ground.

Aeronautical Information

CATS provides airline operators with essential aeronautical information necessary for safety, regularity and efficiency of international air navigation.

The ATS Reporting Offices provide aircraft operators services associated with the submission of flight plans and the distribution and reception of messages of air traffic services.

Pre-Flight Information Services, which provide pilots with current Notice to Airman (NOTAM) containing information of operational significance prepared prior to flight, are also available at the Reporting Offices.

Airspace Management and Instrument Flight Procedure Design

CATS coordinates with stakeholders to facilitate the development of Cambodian airspace for the safety, efficiency and flexibility in accordance with the needs of airspace users. This also includes the facilitation and coordination of military operations to ensure that military and civil aircraft are safely operated. The development of ATS routes, both domestic and international, is prioritized in order to increase flight handling capacity and enhance safety.

CATS handles the design and maintenance of instrument flight procedures such as Instrument Approach Procedure (IAP), Standard Instrument Arrival (STAR) and Standard Instrument Departure (SID) and ensures that they are published with standard obstacle clearances, the needs of the users and environmental protection.