{ "name": "FlightDelayHQ Airport Delay Cancellation Series", "title": "Airport Delay Cancellation Series", "url": "https://flightdelayhq.com/datasets/airport-delay-cancellation-series/", "csv": "https://flightdelayhq.com/datasets/airport-delay-cancellation-series.csv", "markdown": "https://flightdelayhq.com/datasets/airport-delay-cancellation-series/index.md", "computed_at": "2026-10-18", "license": "https://flightdelayhq.com/terms", "headline": "The median published figure in the Airport Delay Cancellation Series is 2.50 percent across 2 sources' own pages (range 1.71 to 3.30 percent), read 12 October 2026.", "quotes": [ "The median published figure in the Airport Delay Cancellation Series is 2.50 percent across 2 sources' own pages (range 1.71 to 3.30 percent), read 12 October 2026.", "2 of the 14 named sources read in full publish a figure; 12 publish none, read 12 October 2026.", "Airport Delay Cancellation Series, jurisdiction US: median 2.50 percent across 2 sources, read 12 October 2026.", "The median is unchanged since 26 September 2026 (was 2.50 percent across 2)." ], "citation": "\"FlightDelayHQ Airport Delay Cancellation Series\", updated 2026-10-18, https://flightdelayhq.com/datasets/airport-delay-cancellation-series/.", "changed_since": { "since": "2026-09-26", "previous_median": 2.505, "delta": 0, "direction": "unchanged", "sentence": "The median is unchanged since 26 September 2026 (was 2.50 percent across 2)." }, "national": { "unit": "%", "n": 2, "median": 2.505, "min": 1.71, "max": 3.3, "p25": null, "p75": null, "mean": 2.505, "units": { "%": 2 }, "published_sources": 2, "named_sources": 14, "read_sources": 14, "not_published": 12, "published_share": 0.143 }, "by_axis": { "jurisdiction": { "US": { "%": { "n": 2, "median": 2.505, "min": 1.71, "max": 3.3, "p25": null, "p75": null, "mean": 2.505 } } } }, "rows": [ { "source": "BTS TranStats on-time delay cause", "url": "https://www.transtats.bts.gov/OT_Delay/OT_DelayCause1.asp", "figure": "1.71%", "value": 1.71, "unit": "%", "vat": null, "axis": { "jurisdiction": "US" }, "retrieved_at": "2026-10-12", "quote": "Cancelled: 1.71%", "source_class": "primary-government", "text_sha256": "" }, { "source": "BTS Air Travel Consumer Report monthly numbers", "url": "https://www.bts.gov/newsroom/airline-bumping-continues-decline-and-mishandled-baggage-rate-lowest-decades", "figure": "3.3 percent", "value": 3.3, "unit": "%", "vat": null, "axis": { "jurisdiction": "US" }, "retrieved_at": "2026-10-12", "quote": "The reporting carriers canceled 3.3 percent of their scheduled domestic flights, up from both the 0.3 percent cancellation rate posted in September 2016 and the 2.2 percent rate in August 2017.", "source_class": "primary-government", "text_sha256": "42769cc12c141aaeaa30007706854829602fce1f196251a860c5e0d54a6fe56a" } ], "not_published": [ { "source": "BTS airline on-time performance and causes of flight delays", "url": "https://www.bts.gov/explore-topics-and-geography/topics/airline-time-performance-and-causes-flight-delays", "retrieved_at": "2026-09-12", "reason": "every candidate on the page was refused" }, { "source": "BTS TranStats on-time departures by airport", "url": "https://www.transtats.bts.gov/ONTIME/Departures.aspx", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "BTS understanding the reporting of causes of flight delays and cancellations", "url": "https://www.bts.gov/topics/airlines-and-airports/understanding-reporting-causes-flight-delays-and-cancellations", "retrieved_at": "2026-09-12", "reason": "every candidate on the page was refused" }, { "source": "BTS performance data story", "url": "https://data.bts.gov/stories/s/Performance/939q-bf5e", "retrieved_at": "2026-09-12", "reason": "every candidate on the page was refused" }, { "source": "FAA National Airspace System status", "url": "https://nasstatus.faa.gov/list", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "FAA OPSNET", "url": "https://aspm.faa.gov/opsnet/sys/main.asp", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "FAA OPSNET documentation", "url": "https://www.aspm.faa.gov/aspmhelp/index/Operations_Network_(OPSNET).html", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "CAA UK flight punctuality statistics 2025", "url": "https://www.caa.co.uk/data-and-analysis/uk-aviation-market/flight-punctuality/uk-flight-punctuality-statistics/2025/", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "CAA flight punctuality statistics guide", "url": "https://www.caa.co.uk/data-and-analysis/uk-aviation-market/flight-punctuality/statistics-guide/", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "CAA UK flight punctuality statistics notes", "url": "https://www.caa.co.uk/data-and-analysis/uk-aviation-market/flight-punctuality/notes/", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "CAA latest quarterly airport statistics", "url": "https://www.caa.co.uk/data-and-analysis/uk-aviation-market/airports/uk-airport-data/latest-quarterly-statistics/", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "FAA Air Traffic Control System Command Center delay map", "url": "https://www.fly.faa.gov/flyfaa/usmap.jsp", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" } ], "sources": [ { "url": "https://www.bts.gov/explore-topics-and-geography/topics/airline-time-performance-and-causes-flight-delays", "label": "BTS airline on-time performance and causes of flight delays", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.transtats.bts.gov/OT_Delay/OT_DelayCause1.asp", "label": "BTS TranStats on-time delay cause", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.transtats.bts.gov/ONTIME/Departures.aspx", "label": "BTS TranStats on-time departures by airport", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.bts.gov/topics/airlines-and-airports/understanding-reporting-causes-flight-delays-and-cancellations", "label": "BTS understanding the reporting of causes of flight delays and cancellations", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://data.bts.gov/stories/s/Performance/939q-bf5e", "label": "BTS performance data story", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.bts.gov/newsroom/airline-bumping-continues-decline-and-mishandled-baggage-rate-lowest-decades", "label": "BTS Air Travel Consumer Report monthly numbers", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://nasstatus.faa.gov/list", "label": "FAA National Airspace System status", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://aspm.faa.gov/opsnet/sys/main.asp", "label": "FAA OPSNET", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.aspm.faa.gov/aspmhelp/index/Operations_Network_(OPSNET).html", "label": "FAA OPSNET documentation", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.caa.co.uk/data-and-analysis/uk-aviation-market/flight-punctuality/uk-flight-punctuality-statistics/2025/", "label": "CAA UK flight punctuality statistics 2025", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.caa.co.uk/data-and-analysis/uk-aviation-market/flight-punctuality/statistics-guide/", "label": "CAA flight punctuality statistics guide", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.caa.co.uk/data-and-analysis/uk-aviation-market/flight-punctuality/notes/", "label": "CAA UK flight punctuality statistics notes", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.caa.co.uk/data-and-analysis/uk-aviation-market/airports/uk-airport-data/latest-quarterly-statistics/", "label": "CAA latest quarterly airport statistics", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.fly.faa.gov/flyfaa/usmap.jsp", "label": "FAA Air Traffic Control System Command Center delay map", "license": "the publisher's own terms; quoted for reporting and comment" } ], "methodology": "Every row is a verbatim sentence read from the named source's own page through our fetch service on the date shown, hash-pinned to the stored read (the sha of the page's visible text; the raw page is mirrored to R2). 2 of the 14 named sources that could be read published a usable figure; 12 published none and are recorded as not published, never filled in; 0 could not be read (blocked, dead or unreachable) and count nowhere. The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source in % (a source's median where its page yielded several accepted sentences), so N counts sources, never sentences; 35 candidate sentence(s) were refused by a reviewer with the reason recorded. The fuller derivation this dataset is chartered to grow into (not yet what the figures above are; they are each source's own published figure as read): the delay and cancellation rate per airport per carrier per month, computed from the reporting carriers' own filed on-time records and set against the same airport's ten-year median for that month - so today's number is read as normal or abnormal rather than as a bare figure; the cause split (carrier, weather, national aviation system, late aircraft, security) per airport, which is the answer to 'cancelled due to weather'; the gap between a live FAA airspace event and the month's realised rate, which nobody publishes because the live feed and the statistical file are never joined; the GB counterpart from CAA punctuality, so a UK and a US airport can be compared on one axis", "embed": "

2.50 percent

median published figure, Airport Delay Cancellation Series, across 2 sources, read 12 October 2026

Source: FlightDelayHQ Airport Delay Cancellation Series
" }