ATFM Slot Adherence ATFM departure slots are allocated centrally by the European Network Manager upon the request of the local Flow Management Position (FMP), when an imbalance between demand and
ATFM Slot Adherence
ATFM departure slots are allocated centrally by the European Network Manager upon the request of the local Flow Management Position (FMP), when an imbalance between demand and capacity is foreseen at airports and/or en-route. The purpose of such regulation is to hold aircraft on the ground.
An ATFM slot tolerance window is available to ATC to sequence departures. The standard slot tolerance window is [-5 minutes, +10 minutes]. ATC at the departure airport has a joint responsibility with aircraft operators to ensure that flights departure within the allocated ATFM slot tolerance window in order to optimise traffic flow. ATFM departure slot adherence, simply named ATFM slot adherence hereafter, measures the share of take-offs inside the slot tolerance window of [-5 minutes, +10 minutes].
ATFM slot adherence monitoring is a pre-requisite to fine tune traffic predictions at the departure, en-route airspace and at the destination airports. The higher the number of regulated departing aircraft inside the assigned ATFM standard window, the more accurate the predicted traffic and associated down-stream ATFM measures.
ATFM slot adherence monitoring is required by SES legislation. The ATS units are required to provide the information regarding non-compliance to slot adherence for these airports where non-adherence equals or exceeds 20% of the regulated departures, as well as their action plans to mitigate such a non-compliance.
The Network Manager monitors ATFM slot adherence on a monthly basis.
The legislation also requires ATFM slot adherence to be monitored at local level, i.e. at national level with a breakdown at airport level.
Classification system
ATFM slot adherence is classified per Member State, with a breakdown for each airport subject to the SES performance scheme.
Sector coverage
The measures pertain to the Air Transport and Air Traffic Management Sector of the economy.
Statistical concepts and definitions
ATFM slot adherence is defined as the percentage of departures inside an ATFM slot tolerance window of [-5 minutes, +10 minutes].
Statistical unit
The statistical unit is the airport. Airport level data is also aggregated to States.
Statistical population
The statistical population is the set of ‘SES airports’ included in the SES performance scheme.
Reference area
- The first reference period (RP1) covers the calendar years 2012 to 2014 inclusive.
- The second reference period (RP2) covers the calendar years 2015 to 2019 inclusive.
- The third reference period (RP3) covers the calendar years 2020 to 2024 inclusive.
- The fourth reference period (RP4) covers the calendar years 2025 to 2029 inclusive.
Unless decided otherwise, the following reference periods shall be of five calendar years.
Time coverage
The Network manager has monitored slot adherence to ATFM since 2011, but in the scope of the Performance Scheme, 2015 is the first year for which data is presented.
Base period
Unit of Measure
The ATC pre-departure delay is measured in minutes per outbound IFR flight [min/departure].
Reference period
- The first reference period (RP1) covers the calendar years 2012 to 2014 inclusive.
- The second reference period (RP2) covers the calendar years 2015 to 2019 inclusive.
- The third reference period (RP3) covers the calendar years 2020 to 2024 inclusive.
- The fourth reference period (RP4) covers the calendar years 2025 to 2029 inclusive.
Unless decided otherwise, the following reference periods shall be of five calendar years.
Institutional Mandate
Confidentiality
The information is disseminated in accordance with the relevant SES legislation.
Release policy
Release calendar
ATFM slot adherence is released monthly with yearly aggregates.
Release calendar access
User access
Information is disseminated to the general public via the SES Data Portal.
Frequency of dissemination
Data is published monthly with the annual performance aggregate being available in January of the following year.
Dissemination format
Information is disseminated to the general public via the SES Data Portal.
Accessibility of documentation
Documentation on methodology
As per the pertaining regulations (see Institutional Mandate).
For technical questions not addressed in Statistical processing please contact: [email protected] .
Additional definitions of the terms used in the frame of the this KPI are available in the Metadata page.
Quality documentation
There is no specific documentation on procedures applied for quality management and quality assessment.
Quality Management
As per SES legislation,
The data providers shall take the necessary measures to ensure the quality, validation and timely transmission of the data, including providing evidence of their quality checks and validation processes, explanations in response to specific requests from the Commission regarding the quality of the data and, where necessary, action plans to improve data quality. The data shall be provided free of charge, in electronic form where applicable, using the format specified by the Commission.
Quality assurance
Data validation is performed by the Network manager.
Quality assessment
Quality assessment is under the responsibility of the Network manager.
Completeness
The data is collected for all airports subject to SES legislation.
Relevance
The information is published for performance monitoring purposes in accordance with the relevant SES legislation.
Accuracy and reliability
Overall accuracy
The information is published for performance monitoring purposes in accordance with the relevant SES legislation.
Sampling error
There is no sampling and therefore no sampling error.
Timeliness and punctuality
Timeliness
The information is published each month by the Network Manager in their “NM Monthly Adherence to ATFCM Slots” bulletin.
Punctuality
The internal databases are updated daily. The statistical processing is performed once per month.
Comparability
Comparability — geographical
The data is collected centrally by the Network Manager. The data is transmitted to the EUROCONTROL Performance Review Unit and computed consistently for all airports subject to SES legislation.
Comparability over time
Comparisons over time are valid.
https://www.sesperformance.eu/dataportal/metadata/atfm-slot-adherence/
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