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Air traffic management (ATM) aims at ensuring the safe and efficient flow of air traffic. It encompasses three types of services:

  • air traffic services (ATS) including air traffic control (ATC), air traffic advisory services, flight information services and alerting services,
  • airspace management (ASM), the purpose of which is to allocate air routes, zones, flight levels to different airspace users and the airspace structure, and
  • air traffic flow and capacity management (ATFCM) (or air traffic flow management, ATFM) consisting in regulating the flow of aircraft as efficiently as possible in order to avoid congestion in airspace and airports.

The Chicago Convention 1944 (52 signatory states) required each state to provide air navigation services for their own state and early air navigation service providers (ANSPs) were state-controlled monopolies.

In the UK ATM legislation is provided under the Air Traffic Management and Unmanned Aircraft Act 2021.

In Europe, the organisation of ATM is highly fragmented, with each member state having its own ANSPs operating airport towers and centres under various ownership models. The 37 European ANSPs operate 60 control centres in 10.8 million km<sup>2</sup>. Apart from five largest ANSPs (DFS in Germany, DSNA in France, ENAIRE in Spain, ENAV in Italy and NATS in the UK) bearing 60% of total European gate-to-gate service provision costs and operating 54% of European traffic, the remaining 40% of gate-to-gate traffic (airport towers and approach services) costs are borne by 32 smaller ANSPs.

Performance-based navigation and digital integration

Modern air traffic management incorporates performance-based navigation (PBN) and digital communication systems to enhance safety and capacity. These systems rely on satellite-based navigation and controller–pilot data link communications (CPDLC) to reduce voice congestion and increase precision in procedural airspace. Implementation of these concepts by service providers such as Hughes Aerospace and government agencies has enabled advanced route optimization and noise mitigation procedures in complex airspace environments.

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