Demand data repository

Get the most accurate picture of pan-European air traffic demand.

Log in Access conditions
Release 1.0.0 of DDR2-API beginning of 2024

The DDR2-API will provide download access to PREDICT files, Historical files, environment files, and his counters, from computer to computer. This DDR2-API will allow the user to generate forecast and filtered traffic (only if the DDR2 user is allowed to launch such operation). Only users with a DDR2 account will be able to use and request access to the DDR2-API.

Release 2.9.9

New release of DDR2 V2.9.9 was deployed in 08/12/2021. This version updated internal components (Java 7 to 11, Tomcat 7 to 9), Airlines have access to DCT usage report published each AIRAC for each FAB, Airline can download selected flights in Airline Trajectories, Non-airlines users can download more directly their exp2, so6, ALLFT+ files from Historical Traffic, Filtered traffic offers KEV file download, and some cosmetic text were changed in the menu and interface. New occupancy files are created for NEST.

EUROCONTROL, as the Network Manager (NM), provides operational stakeholders with the most accurate picture of past and future pan-European air traffic demand from several years ahead until the day before operations. This also includes environment data, analysis reports and tools (SAAM and NEST).
All this information is managed by and can be accessed via the Demand Data Repository (DDR). Access to the DDR is restricted (see access conditions below).


We forecast future traffic trends thanks to the knowledge of past traffic flows and several thousands of flight intentions which airlines and airports have shared with us. We collect, store, analyse and process these data on a daily basis to support strategic, seasonal and pre-tactical planning, and special events or major air traffic management (ATM) evolution projects.
We also provide a refined analysis of past demand in order to facilitate post-operation analysis and to identify best practices for future operations.


More precisely, the DDR gives access to the following:

  • Past traffic data –These focus on traffic demand, and most recently filed flight plan traffic trajectories and actual trajectories from August 2012 to the present date, which can be used for past analysis;
  • Past and pre-ops environment data – These contain all the information required to analyse and process sector loads, capacity bottlenecks, re-routeing options, etc. Users and EUROCONTROL’s experts use them to process future traffic trajectories;
  • Strategic traffic forecasts – These cover the planning phase, from 18 months to 7 days before operations. They are used for medium- to-short-term capacity planning and seasonal planning. Users can themselves generate and download this type of forecast, with several 4D trajectory processing options;
  • Pre-tactical traffic forecasts – These focus on the planning phase, from 6 days to 1 day before operations. Network pre-tactical planning is supported by the NM ETFMS PREDICT system;
  • NEST and SAAM tools – These analyse and process a great deal of information for the purpose of facilitating airspace design and capacity planning in Europe. They are compatible with DDR data and can be downloaded directly from the portal;
  • DCT use – For each AIRAC cycle, we prepare a dedicated report (Excel file sheet with a pivot table) fed with all European DCTs (direct routeings) and flight plan use and misuse by airlines;
  • DCT mapping – This is a separate application, hosted by DDR2, which provides a way to display and filter on a map a great deal of environmental information – airports, sectors, DCTs, routes, etc. The next release of DCT mapping will provide information concerning free route areas and free route entry and exit points.


The DDR addresses the needs of a wide range of users such as:

  • air navigation service providers (ANSPs), who use it to prepare and optimise their capacity plans;
  • airlines, who rely on it to detect flight efficiency improvement opportunities by visualising and anonymously comparing flight plan trajectories for any period of time in the past;
  • airspace management actors, for airspace management and coordination of the available airspace;
  • airports, with the aim of integrating their local plans with the Network Operations Plan;
  • the NM, at central/FAB/local level.

Note for users

Downloads and generation operations are subject to counters, which limits the number of weekly operations per user. Access to the tool and downloaded data cannot be shared.

COVID-19-related measures

A certain number of measures had to be taken urgently to allow DDR2 to adapt to the new traffic flows and network situation. These included the following:

  • Revision of a large number of processes in order to adapt and reduce thresholds (daily number of flights and file size) so that the DDR did not fail owing to the fall in traffic;
  • Temporary suspension of a functionality allowing the detection of flight intention on the basis of past traffic trends. Current forecast processing is complementing this. Forecasts provide a more reasonable number of flights in the short term (April/May/June 2020);
  • Putting-in-place of some provisional rules to delete flights which we know will not take place.

Access conditions

Access to the DDR portal is restricted to air navigation service providers (ANSPs) and airline operators (AOs) within Europe, on the basis of approval of a licence agreement and formal acceptance by EUROCONTROL. Airlines are allowed to download (historical or forecast) traffic data for their own fleets only.

As of June 2019, we no longer provide access to the DDR portal to students. To be granted access we require a business email (email addresses such as gmail, hotmail, yahoo and alike will not be accepted).

Request access

To access the portal:

  1. Register to OneSky Online
    You can register to OneSky Online in a few minutes and this will allow you to access this and many other EUROCONTROL tools.
  2. Subscribe to the tool
    Once you have registered, log in, and click on the 'Manage' button at the bottom right-hand side of your screen. The page which comes up will allow you to manage the tools you are subscribed to. Find the database in the list, click on it, provide a business justification for requesting access and click on 'Subscribe'.
  3. Confirmation
    Your request will be vetted and you will receive confirmation that you can now access the tool. The time this takes depends on the team in charge and the process applied. Once you have received confirmation, log in to OneSky Online, click on the tool which is in your list and enjoy.

Register to OneSky Online


If you experience problems accessing or using the tool, please contact us by using the contact form on the bottom right hand-side of this page.

DDR2 Privacy Statement

EUROCONTROL protects your personal data in accordance with EUROCONTROL Regulation on Personal Data Protection - Download our DDR2 Privacy Statement to learn more.