Difference from Long-Term Average metric

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Term Difference from Long-Term Average metric
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Mandatory for


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Abbreviation

DLTA

Definition

[a metric] designed to measure relative change in time-based performance (e.g. flight time) normalised by selected criteria (origin, destination, aircraft type, etc.) for which sufficient data are available. The analysis compares actual performance for each flight of a given city pair with the long term average (i.e. average between 2003 and 2009) for that city pair.

Definition Source

EUROCONTROL (2012), Performance Review Report 2011

Note