En-route IFR Flights and ATFM Delays (AUA)
Updated monthly Daily data Latest release October 14, 2026
Data and Resources
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En-route ATFM delay (AUA) (API table).csvCSV
Consolidated from the source files in this dataset. Formats are normalised...
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En-Route_ATFM_Delay_AUA.xlsxXLSX
Covers 2011-01-01 to 2026-09-30. Released 2026-10-14.
19 yearly files
- ert_dly_ansp_2026.csv.bz2 93.2 KiB
- ert_dly_ansp_2025.csv.bz2 112.5 KiB
- ert_dly_ansp_2024.csv.bz2 118.5 KiB
- ert_dly_ansp_2023.csv.bz2 111.8 KiB
- ert_dly_ansp_2022.csv.bz2 106.8 KiB
- ert_dly_ansp_2021.csv.bz2 73.7 KiB
- ert_dly_ansp_2020.csv.bz2 67.4 KiB
- ert_dly_ansp_2019.csv.bz2 114 KiB
- ert_dly_ansp_2018.csv.bz2 112.2 KiB
- ert_dly_ansp_2017.csv.bz2 100.2 KiB
- ert_dly_ansp_2016.csv.bz2 96.9 KiB
- ert_dly_ansp_2015.csv.bz2 94 KiB
- ert_dly_ansp_2014.csv.bz2 93.8 KiB
- ert_dly_ansp_2013.csv.bz2 93.1 KiB
- ert_dly_ansp_2012.csv.bz2 94.6 KiB
- ert_dly_ansp_2011.csv.bz2 91.7 KiB
- ert_dly_ansp_2010.csv.bz2 97.9 KiB
- ert_dly_ansp_2009.csv.bz2 91.1 KiB
- ert_dly_ansp_2008.csv.bz2 101.8 KiB
API
API name: en-route-atfm-delay-aua
First 5 rows · Download all rows: CSV · TSV · JSON · XML
Code examples
curl
curl 'https://polaris.goens.dev/api/3/action/datastore_search?resource_id=en-route-atfm-delay-aua&limit=5'Python
import pandas as pd
df = pd.read_csv('https://polaris.goens.dev/datastore/dump/en-route-atfm-delay-aua?format=csv')R
df <- read.csv('https://polaris.goens.dev/datastore/dump/en-route-atfm-delay-aua?format=csv')API documentation and rate limits
Cite this data
Source: EUROCONTROL Aviation Intelligence Unit. En-route IFR Flights and ATFM Delays (AUA). https://polaris.goens.dev/dataset/en-route-atfm-delay-aua
May be copied in whole or in part, provided that EUROCONTROL is mentioned as the source and it is not used for commercial purposes. Full disclaimer
About this data
Please note that software release 20.0 of the Network Manager on 04 April 2016 introduced a change to improve the accuracy of the ATFM delay calculation for operational purposes. For more information on the change in methodology click here .
The en-route ATFM delay provides an indication of ATFM delays on the ground due to constraints en-route.
In Europe, when traffic demand is anticipated to exceed the available capacity in en route centres or at airports, Air Traffic Control ( ATC ) units may request the local Flow Management Position ( FMP ) to instigate an Air Traffic Flow Management (ATFM) measure, or regulation . Aircraft expected to arrive during a period of congestion are given ATFM delay at their departure airport, under the authority of the Network Manager, in order to regulate the flow of traffic into the constrained downstream en route sector or airport, thus ensuring safety.
The calculation of En-route ATFM delay is based on a well established and commonly accepted algorithm and has been in use as a commonly agreed proxy for en-route capacity shortfalls since 1999.
The ATFM delays are calculated as the difference between the estimated take-off time calculated from the filed flight plan including updates and the calculated take-off time allocated by the central unit of ATFM.
The reason for the regulation is indicated by the responsible Flow Management Position (FMP).
The delay is attributed to the most constraining ATC unit.
Data sources
- Published by
- EUROCONTROL - Performance Review Unit (PRU)
- Underlying data
- Network Manager; Performance Review Unit
- Contact
- PRU-Support@eurocontrol.int
The table view shows where each column comes from, under Data Dictionary.
Recent changes at the source
- 2016-10-01: LF: add LFDSNA TVS delay from July 2016
- 2016-11-17: All, from 04 April 2016: ATFM delay calculation based on Version 2 (see web page for more information)
- 2017-07-14: All, 2017-05-26: The day has been reloaded to correct an issue that has been detected.
- 2018-06-17: All, 11-13-March 2018: Data of March have been updated (partial data in 11-13 March 2018 due to a technical issue)
- 2018-09-01: All, 2018-04-03: traffic data of April 2018 have been updated (partial data on 3rd April 2018 due to a technical issue)
- 2018-10-01: All, May-Sep 2018: Traffic count needed slight revision to ensure continuity to data series before May 2018
- 2021-04-12: ANS Finland, 2011-2021: Name of “ANS Finland” changed to “Fintraffic ANS”
- 2026-01-01: Nav Portugal, 2019: 1928 flights for "NAV Portugal" on 14 May 2019 added
Additional Info
| Field | Value |
|---|---|
| Update frequency | Monthly |
| Time resolution | Daily |
| Data from | 2008-01-01 |
| Data to | 2026-09-30 |
| Data description | https://ansperformance.eu/reference/dataset/en-route-atfm-delay-aua/ |
| Methodology | https://ansperformance.eu/definition/atfm-delay/ |
| Source page | https://ansperformance.eu/data/ |