Methodology
How we count
Short version: we only count what we saw on a departure board, and we tell you how much we saw.
Where the figures come from
Tomo Flight Claim reads the departure boards of the airports listed here several times a day through a commercial flight-data provider. Every departure we see is stored with its scheduled time, its actual time and its status. The figures on this site are weekly totals of those observations.
What counts as a disruption
A cancellation is a departure the board marks as cancelled. A long delay is a departure that left three hours or more after its scheduled time: the threshold above which passengers can be owed EU261 compensation. Delays of one to three hours are shown separately and do not count towards the rank.
Coverage and settled share
Coverage is the share of scheduled departures we actually observed. Settled share is the share we saw again after departure, so we know how the flight ended. A board read only once a day can miss cancellations announced late; when the settled share is below 70%, the row gets a footnote.
When a row gets a rank
An airport or airline is ranked only with at least 60% coverage and 50 observed departures in the week. Below that a percentage is noise, so we show the row without a place in the ranking.
What these figures do not say
We do not judge the cause. A cancellation caused by a storm and one caused by a staff shortage count the same here, while only the second usually gives a right to compensation. Methodology version: rollup-v1.
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