Turkey has a large and very important airspace (982,286 km2), located among the three continents (Europe, Asia and Africa). Due to its special geographical location, Turkish airspace includes crossroads of north-south and east-west traffic flows between Europe, Asia and the Middle East. İstanbul FIR is bordered by four ECAC and one Non-ECAC FIRs, while Ankara FIR is bordered by three ECAC and six Non-ECAC FIRs.

DHMİ (Devlet Hava Meydanları İsletmesi - General Directorate of State Airports Authority), Air Navigation Department is the unique Civil Air Navigation Service Provider for Turkey.
DHMİ provides air navigation services by means of its approach control units and aerodrome control towers at 34 Turkish airports, and en-route air navigation services throughout Turkish airspace from two separate Area Control Centers, located in Ankara and İstanbul. Menderes (İzmir) Approach Control Unit also provides area
control service for the south-eastern part of İstanbul FIR. These Area Control Centers have taken the responsibility of some transition tasks in the area and arranging air traffic flow to/from Europe. DHMİ takes all measures to provide high quality services in a safe ATM environment.

DHMİ, Air Navigation Department is responsible for the following tasks:

- Air Traffic Management:
- Air Space Management
- Air Traffic Services (Air Traffic Control, ensured by different types of units according to the airspace characteristics - Area Control Center, Approach Control Unit , Aerodrome Control Tower, Flight Information Services, Alerting Services)
- Safety Management (ATM occurrence investigation)
- Direct participation in EUROCONTROL and ICAO activities,
- Airspace design (Designing instrument approach, departure and landing procedures, ATS routes, sectorisation)

- Aeronautical Communications Management

- Aeronautical Information Management (Collecting and distributing aeronautical data, such as publishing, editing and amending the Turkish AIP; publishing Aeronautical Information Circulars and Pre-flight bulletins; producing aeronautical charts; receiving, issuing and distributing NOTAMs)

- Flight Inspection Services (two Citation 5 aircraft and two AS 355 F2 helicopters serve for the approval of instrument procedures and calibration of facilities)

- System Project Development and Assessment Management.

DHMİ is also responsible for training of all ANS staff and regulation of their license and rating procedures as well as manpower planning.