Questions about the figures, answered

Tomo Flight Claim reads the departure boards of the airports in the index several times a day. 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.

One week at a time, Monday to Sunday. The dates are shown at the top of the disruption index. A week appears once it has ended.

The European airports whose departure boards we read, and every airline departing from them. Airports and airlines with fewer than 50 observed departures in a week are left out of the tables; the number left out is shown below each table, so nothing disappears silently.

Definitions differ. Many sources count arrival delays, use a 15-minute threshold or cover other airports and periods. We count cancelled departures and departures that left three hours or more late, and we publish how much of each board we actually saw.

Yes, when we find a better way to count. Every change gets a new methodology version, so you can tell which figures were counted the same way. Current version: rollup-v1.

A departure the board marks as cancelled. We don't guess: a flight that simply disappears from the board is not counted as cancelled.

A departure that left three hours or more after its scheduled time. Three hours is the EU261 threshold for compensation, although EU261 measures the delay on arrival rather than departure.

They are shown separately on each airport page, but they don't count towards the rank. The rank is about the disruptions that hurt travellers most: cancellations and delays of three hours or more.

Cancellations plus departures delayed three hours or more, divided by the number of departures we observed. The highest share comes first. Only rows with enough coverage and enough observed departures get a place.

The share of scheduled departures we actually observed. A percentage without its coverage says little, which is why every percentage on this site sits next to it.

The settled share is the share of departures 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.

Because we observed too little that week. A row is ranked only with at least 60% coverage and 50 observed departures; below that a percentage is noise, so we show the row without a place.

It depends on how often a departure board is read. Each airport page says how often we read that board, and so within how many hours a disruption appears there.

No. EU261 compensation depends on the cause: bad weather or air-traffic-control strikes usually count as extraordinary circumstances. The figures here only show that a flight was cancelled or left three hours late.

No. A cancellation caused by a storm and one caused by a staff shortage count the same here. Judging the cause takes the details of the individual flight, which a weekly total doesn't have.

If your flight arrived three hours or more late or was cancelled at short notice, you may be owed compensation under EU261, depending on the cause. Tomo Flight Claim checks that for free and only charges a fee when the airline pays.

Yes. Mention "Tomo Flight Data" as the source and link to this site. From the week of 12 October 2026 the figures are CC BY 4.0; earlier weeks are CC BY-NC 4.0 (non-commercial).

Mention "Tomo Flight Data" as the source and link to tomoflightdata.com. That is all CC BY 4.0 asks.

Yes. Our flight data API, with actual runway times, confirmed cancellations and a live update stream, is in early access and free during that phase. The homepage tells you how to request access.

Email support@tomoclaim.com with the airport or airline and the week. We check every report and correct the figures if we made a mistake.

The company behind Tomo Flight Claim, an EU261 compensation service. We read departure boards to check claims anyway, and publish the totals because they are useful to travellers, journalists and researchers.

We earn money when passengers claim compensation, so we have an interest in disruptions being visible. That is exactly why every figure comes with its coverage and why the method is public: you can check how we count.