British Airways extraordinary circumstances: what the airline must prove
Reviewed on 10 August 2026. British Airways can avoid fixed delay or cancellation compensation only by proving that an extraordinary circumstance caused the disruption and that the event could not have been avoided even if all reasonable measures had been taken. The passenger does not have to disprove a vague label. Refund, rerouting and care usually remain available even when the defence succeeds.
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The assessment is flight-specific. A genuine external event somewhere in BA's network does not exempt every later rotation without a demonstrated causal chain.
The two-part defence
| Part | Question for British Airways |
|---|---|
| Extraordinary event | Was the cause outside events inherent in normal airline activity and beyond actual control? |
| Reasonable measures | What practical steps could BA take without intolerable sacrifice, and what did it do? |
Both elements are required. Evidence that Heathrow restricted a runway may establish an external event, but BA should still explain how it protected the particular service, allocated resources and offered rerouting.
Events that may qualify
Weather incompatible with safe operation, a binding air-traffic-management decision, political instability, a security risk, sabotage, airport closure and a manufacturer-announced hidden aircraft defect can fall within the defence. The facts must meet the test; inclusion in a list does not decide an individual flight.
A bird strike can be extraordinary, but subsequent delay may still include ordinary repair or resource time. Damage from mobile boarding stairs was treated differently in European case law because such equipment is regularly involved in airline activity. The origin and control of the event matter.
External industrial action by air traffic controllers or airport security staff can qualify. A strike by the airline's own workforce may be inherent in its operations, especially where it concerns employment negotiations. Identify the employer rather than relying on the word "strike".
Events that are ordinarily internal
Routine technical problems, ordinary wear and tear, foreseeable maintenance, aircraft rotation, commercial cancellation and standard crew planning generally sit within airline operations. An event can happen unexpectedly without becoming extraordinary.
The UK Supreme Court addressed BA CityFlyer directly in Lipton. A captain became ill off duty shortly before a Milan-London service. The Court held that managing staff illness is inherent in airline activity and that BA CityFlyer had not proved extraordinary circumstances. It emphasised consumer protection and the carrier's burden.
Airline-controlled computer systems deserve the same structured inquiry. BA should identify whether the failure was its own platform, a supplier, airport infrastructure or an external cyber event. Calling every outage "outside control" skips the inherency and mitigation tests.
Causation must reach the claimed flight
BA often operates aircraft and crews across a sequence of services. An external event can delay an earlier sector and continue affecting later flights, but the carrier should set out that rotation. Ask for:
- the event location and time;
- the aircraft or crew sequence;
- restrictions applying to the disputed service;
- delay minutes attributed to each cause;
- recovery options considered;
- the reason replacement resources were unavailable.
The further the disruption is removed from the initial event, the more important mitigation becomes. A full day of knock-on delay should not be accepted from a one-hour morning restriction without explanation.
Mixed causes require division. If weather contributes 80 minutes and a later routine defect contributes another three hours, the ordinary component can leave a compensable final delay after extraordinary time is excluded.
Reasonable measures do not require the impossible
The law does not require BA to make an intolerable sacrifice, but a large network carrier should show realistic planning. Relevant possibilities can include spare crew, another aircraft, protected connection seats, partner rerouting, changing rotation and communicating early enough to reduce care costs.
The question is not whether one imaginable measure existed in hindsight. It is whether measures appropriate to the event and resources were reasonably available. Ask what BA actually considered, when and why it rejected alternatives.
For cancellation, reasonable rerouting remains a passenger right even if the cause itself was extraordinary. The compensation defence should not be used to limit Article 8 transport options.
Evidence a passenger can collect
Save BA's exact explanation, airport notices, METAR or official weather data where relevant, NOTAM or air-traffic information, and records of comparable services. Use official material cautiously: another flight may have different aircraft, runway, crew or slot conditions.
Record final arrival, original and replacement itinerary, operating carrier and all offers. Photographs and staff comments support context but should not be exaggerated into technical conclusions.
In the claim, ask BA to provide event-specific records. A concise request for cause, causal link and reasonable measures is more useful than insisting an event was "the airline's fault" without evidence.
Compensation and care must be separated
An accepted defence removes fixed payment for delay or cancellation under Article 5(3). It does not normally remove the choice of refund or rerouting after cancellation. It also does not erase meals, hotel accommodation and transport while the passenger waits for covered replacement travel.
Submit receipts as a separate schedule. If BA rejects both compensation and care with the same weather explanation, ask it to decide the care request under the correct provision. The BA right-to-care article explains this distinction.
Denied boarding and downgrade use different structures. An airline cannot usually invoke extraordinary circumstances to avoid involuntary denied-boarding compensation where it simply lacks seats. Downgrade reimbursement depends on carriage in a lower cabin, not airline fault.
Responding to a refusal
Quote BA's stated event and identify the missing part. For "ATC restrictions", ask for the decision, time window and effect on the flight. For "technical issue", ask whether it was a routine defect or an external hidden manufacturing problem. For crew absence, cite the facts of Lipton where comparable.
British Airways participates in CEDR. After a final response or eight weeks without resolution, an eligible passenger can present the evidence and disputed reasoning to the approved ADR provider. The BA rejected-claim guide shows how to organise that file.
This page uses the law current on 10 August 2026. The adopted EU revision will later clarify parts of the extraordinary-circumstances framework, but it is not yet applicable and does not automatically amend UK261.
FAQ
Is "operational reasons" an extraordinary circumstance?
Not by itself. It does not identify an event, show that it was outside normal operations or explain the measures BA took.
Can pilot illness excuse a BA CityFlyer cancellation?
The UK Supreme Court held in Lipton that the captain's illness in that case was inherent in airline activity and was not extraordinary.
Does an ATC restriction remove every right?
No. It may defeat fixed compensation if causation and mitigation are proved, while rerouting and care can remain due.
Must BA disclose how an earlier disruption reached my flight?
The carrier bears the defence burden. A rotation chronology and mitigation evidence are appropriate where it relies on a knock-on event.
Can extraordinary and ordinary causes exist together?
Yes. The relevant external minutes can be separated; compensation may survive if the remaining carrier-related arrival delay still reaches the threshold.