Airport Collaborative Decision Making (A-CDM)

Airport CDM (A-CDM) aims at improving the overall efficiency of airport operations by optimising the use of resources and improving the predictability of events. It focuses especially on aircraft turn-round and pre-departure sequencing processes.

Increased predictability can be of significant benefit for all major airport and network operations; it raises both productivity and cost-efficiency.

Benefits to Airports

For the Airport Operator, improved use of stands/gates leads to fewer late stand changes. More stable traffic flows and reduced taxi times make for fewer queues on runways and less congestion on the apron or taxiways.

As an Aircraft Operator, you will have enhanced awareness of the status and location of your aircraft, as you will receive more accurate aircraft arrival times as well as improved departure sequence information. Fuel burn due to queues at the runway threshold will be reduced; this naturally has both economic and environmental benefits.

In addition, aircraft operators could further optimize their flight operations by opting for the Estimated Off-Block Time (EOBT) update service for A-CDM departures, which can be activated per A-CDM airport on request. Once activated, NMOC automatically files a DLA message using the TOBT values in the DPI messages.

Air Traffic Control will benefit from improved runway and capacity planning. More accurate take-off time predictions will help the Network Manager make more precise calculations of network demand. This enhanced flow and capacity management will result in better ATFM slot allocation, improved compliance and a reduced number of missed slots.

The Ground Handler will benefit from having more accurate in-block times for arrivals, as well as from knowing the exact time departing aircraft have been given start-up clearance. This makes for more accurate planning and a more efficient use of resources. Passengers will benefit from reduction in delays and fewer missed connections. After disruptions, recovery will be faster. Also for arrivals, more accurate information can be delivered to Flight Information Display Systems and service desks.

Along with this increased predictability, Airport CDM brings myriad other benefits for airports, such as environmental impact reduction and enhanced planning of the turn-around, to name but two.

Benefits to the Network

The growing number of airports adopting A-CDM benefits the ATM network as a whole by improving en-route and sectoral planning. This is achieved by the Network Manager’s receiving more accurate Target Take-Off Times from the airport, via Departure Planning Information (DPI) messages.


A-CDM is fully implemented in 28 airports accross Europe, including: Amsterdam, Barcelona, Berlin Schönefeld, Brussels, Copenhagen, Düsseldorf, Frankfurt, Geneva, Hamburg, Helsinki, Lisbon, London Gatwick (*DPI message exchange between Gatwick Airport and NMOC is temporarily suspended), London Heathrow, Lyon-Saint Exupéry, Madrid, Milan Malpensa, Milan Linate, Munich, Naples, Paris CDG, Paris Orly, Oslo, Palma de Mallorca, Prague, Rome Fiumicino, Stockholm Arlanda, Stuttgart, Venice, Zurich.


There are five distinct and fundamental phases from the moment it is decided Airport CDM may be of interest for your airport:

  1. Information Phase - many organisational decisions, based on A-CDM’s benefits, need to be taken in order to gain support from all partners.
  2. Analysis Phase - more investigations can be carried out by having a Gap Analysis done by EUROCONTROL or independent consultants.
  3. Cost-benefit analysis (CBA) - this provides a better understanding of the expected benefits and investments.
  4. Implementation Phase – a bottom-up process to implement the elements that constitute the Airport CDM operational concept is run in this phase.
  5. Validation and operation of CDM elements – this is a pre-requisite to qualify for operational evaluation tests by Network Operations, connection with NMOC (Network Manager Operations Centre) and live operations with DPI transmission so as to become a fully implemented CDM airport.


So as to ensure the harmonious and standardised implementation of Airport CDM, EUROCONTROL - in conjunction with its stakeholders - has produced an Implementation Manual and continues to update it with guidance material and valuable lessons learned.

The document guides users, decision makers, as well as technical and operational experts, through all the steps required for successful implementation and operation. It is derived from the Airport CDM Operational Concept Document, the Airport CDM Functional Requirements Document and forms the basis of the EUROCAE interfacing documentation. An Airport CDM checklist is also featured in the manual.


Support Service

The EUROCONTROL Airport CDM Team actively supports local Stakeholders at airports in successfully implementing Airport CDM. EUROCONTROL provides a three-day “Introduction to Airport CDM” course at its Training Institute in Luxembourg twice yearly; online training is also available. On-site training can be provided on request.


This project is supported by the European Commission's Trans-European Transport Network programme (TEN-T).


The documents below have been prepared and are provided to further assist in the implementation of Airport CDM.

Airport Collaborative Decision Making (Airport CDM) is now embedded in the ATM operational concept as an important enabler that will improve...

Publication date: 
7 April 2017

Airport Collaborative Decision Making ...

Publication date: 
13 December 2017

The impact assessment of the EUROCONTROL Airport Collaborative Decision Making (A-CDM) concept presents an up-to-date evaluation of the impact of...

Publication date: 
18 April 2016

This document presents Safety Case Guidance Material for the EUROCONTROL Airport Collaborative Decision Making (A-CDM) Project. The relevant A-CDM...

Publication date: 
1 February 2016

Aircraft operators (AOs) can now delegate the filing of delay (DLA) messages for departures from designated Collaborative Decision Making (CDM)...

Publication date: 
23 January 2018

This document presents a safety assessment of the EUROCONTROL Airport Collaborative Decision Making (A-CDM) Project. The relevant A-CDM milestones...

Publication date: 
1 February 2016

The Airport Collaborative Decision Making (A-CDM) concept was developed with a view to enhancing the quality of both airport and network...

Publication date: 
5 February 2014

A-CDM team

Contact us for more information about A-CDM.

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