Turkey has a large airspace (982,286 km2), with a total length of controlled ATS routes of 44.569 km, placed among the three continents (Europe, Asia and Africa). Due to this special geographical location, Turkish airspace includes crossroads with 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.
Turkish Area Control Centres have taken the responsibility of some transition tasks in the area and in the arrangement of air traffic flow to and from Europe.

The DHMİ, the Air Navigation Service Provider of Turkey, provides high quality services in a safe ATM environment.
The DHMİ provides air navigation services with approach control units and aerodrome control towers at 34 Turkish airports, and en-route air navigation services over Turkish airspace by means of two Area Control Centres, located in Ankara and İstanbul. The İzmir (Menderes) Approach Control Unit also provides area control service for the south-eastern portion of the İstanbul FIR.
The scope of services covered by the DHMİ is all GAT and OAT in Controlled Airspace.
The DHMİ 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 Centre, Approach Control Unit and 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 Check Services (Two aircraft [Citation 5] and two helicopters (AS 355 F2) serve for the approval of instrument procedures and calibration of facilities)

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

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