The Legal Definition: Two Conditions Must Both Be Met
EU Regulation 261/2004 (Recital 14 and Article 5(3)) states that an airline is not obliged to pay compensation if it can prove that the cancellation or delay was caused by extraordinary circumstances which could not have been avoided even if all reasonable measures had been taken.
This is a two-part test. Both conditions must be satisfied:
The event was extraordinary
The event was outside the airline's normal activity and beyond its actual control — it could not be expected to form part of ordinary airline operations.
The delay could not have been avoided
Even with all reasonable measures — including re-routing, substituting aircraft, rescheduling crew — the disruption still could not have been avoided.
The burden of proof lies entirely with the airline. It must provide documented evidence — official weather reports, ATC communications, airport authority notices — to support its claim. A generic statement that "the flight was delayed due to extraordinary circumstances" is legally insufficient.
What Counts as Extraordinary Circumstances — and What Does Not
The regulation gives examples but does not provide an exhaustive list. European courts — particularly the Court of Justice of the EU (CJEU) — have shaped the definition through key rulings over the past 15 years.
Typically qualifies
Severe weather
Storms, hurricanes, extreme snow/ice, lightning — genuinely severe and unforeseeable for that airport/season
Air traffic control (ATC) strikes
Industrial action by ATC staff is outside airline control. Airline strikes are NOT extraordinary.
Airport security incidents
Terminal evacuations, bomb threats, runway incursions by third parties
Political instability / airspace closure
Government-ordered airspace closures, military conflicts affecting routes
Hidden manufacturing defect
A manufacturing defect discovered for the first time, not previously known to exist — very narrow exception
Collision with birds or foreign object
Bird strike damaging engine or windshield — case by case, depends on whether damage was truly unforeseeable
Does NOT qualify
Technical faults (standard)
CJEU ruling in Wallentin-Hermann (2008): technical problems inherent in normal aircraft operations are not extraordinary.
Airline staff strikes
Industrial action by the airline's own pilots or cabin crew is the airline's internal matter — not extraordinary.
Crew scheduling failures
Running out of pilots due to planning errors, crew fatigue limits reached due to earlier delays
Mild or common weather
Light rain, standard seasonal fog, moderate winds that are typical for the airport or time of year
Previous flight late (rotation delay)
The 'late arriving aircraft' excuse is often rejected unless the original cause was truly extraordinary and no spare aircraft was available.
Overbooking / commercial decisions
Any delay caused by the airline's own commercial choices is fully within its control.
Key Court Rulings That Shaped the Definition
Wallentin-Hermann v Alitalia (CJEU, 2008)
Ruling: Technical problems discovered during pre-flight checks are NOT extraordinary circumstances — they are inherent in the normal operation of an aircraft.
Impact: Airlines can no longer use routine mechanical faults as a blanket excuse. This ruling is still the leading precedent on technical issues.
Sturgeon v Condor / Böck v Air France (CJEU, 2009)
Ruling: Passengers whose flight is delayed 3+ hours at arrival have the same right to compensation as passengers of cancelled flights.
Impact: Confirmed that arrival delay (not departure delay) is the trigger for EU261 compensation.
Van der Lans v KLM (CJEU, 2015)
Ruling: An unexpected technical problem that emerged shortly before departure does not constitute an extraordinary circumstance — it is part of normal operational risk.
Impact: Narrowed the 'surprise technical fault' defence further. Airlines cannot claim extraordinary circumstances just because a fault was unexpected.
Pešková / Pešek v Travel Service (CJEU, 2017)
Ruling: A bird strike can constitute an extraordinary circumstance — but only if the airline demonstrates it took all reasonable measures to avoid the delay once the damage was discovered.
Impact: Introduced a proportionality test for rare events: even genuine extraordinary circumstances require the airline to act diligently.
Extraordinary Circumstances Don't Cancel Your Care Rights
Even when extraordinary circumstances exempt the airline from paying compensation, you retain the right to care at the departure airport. These are unconditional and do not depend on the cause of the disruption:
Meals & refreshments
Free food and drinks proportionate to the waiting time, from 2 hours departure delay (short/medium haul) or 4 hours (long haul).
Hotel accommodation
If you must stay overnight due to the disruption — hotel plus transport to and from the hotel, at the airline's expense.
Refund or re-routing
If the delay exceeds 5 hours and you decide not to travel, you are entitled to a full refund of your ticket and a return flight home if needed.
How to Challenge a Wrongful Extraordinary Circumstances Claim
Airlines routinely over-invoke this exemption. If you receive a rejection citing extraordinary circumstances, do not accept it automatically. Here is how to push back:
Request documented evidence
Ask the airline in writing for the specific evidence supporting its claim — weather reports, ATC communications, official airport authority statements. If it cannot produce these, the claim is weak.
Check the real reason via FlightAware or Flightradar24
Look up your flight number on a flight tracking service. The departure and arrival data, as well as the stated reason for delay, are often publicly available. A 'weather' delay that shows no adverse conditions on the day is challengeable.
Submit to the national enforcement body (NEB)
If the airline rejects your claim, escalate to your country's NEB: CAA (UK), ULC (PL), LBA (DE), DGAC (FR), IAA (IE). These bodies can compel the airline to pay or explain its decision.
Use a claim company or go to court
Specialist claim companies like ClaimWinger assess claims professionally and handle legal escalation if needed. They work on a no-win no-fee basis (30% commission on success, + VAT for Polish residents). Alternatively, the European Small Claims Procedure allows you to sue in court online.
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Frequently Asked Questions
What are extraordinary circumstances under EU261?
Extraordinary circumstances are events outside the airline's control that could not have been avoided even with all reasonable measures — severe weather, ATC strikes, security incidents, political airspace closures. When proven, they exempt the airline from paying compensation, though care rights still apply.
Is a technical fault an extraordinary circumstance?
Almost never. The CJEU ruled in Wallentin-Hermann v Alitalia (2008) that technical problems inherent in normal aircraft operations are not extraordinary. The only narrow exception is a manufacturing defect discovered for the first time, or damage caused by a third party.
Does bad weather always exempt the airline from paying?
No. Only severe, genuinely unforeseeable weather qualifies. Common seasonal conditions — fog at certain airports, moderate rain, standard winter weather — do not. The airline must also prove it took all reasonable measures to avoid or minimise the disruption.
What if the previous aircraft rotation was delayed by extraordinary circumstances?
This is often disputed. Courts accept cascade delays only if the original cause was truly extraordinary and no replacement aircraft was available with reasonable effort. Airlines frequently misuse this argument — it is always worth challenging.
Who has to prove extraordinary circumstances?
The airline. It must provide documented evidence — weather reports, ATC communications, official notices — showing both that the circumstances were extraordinary and that all reasonable measures were taken. A vague or undocumented claim does not meet the legal standard.
Don't Let an Unfair Rejection Stand
Airlines deny legitimate claims every day by citing extraordinary circumstances. ClaimWinger's legal team challenges invalid refusals — no win, no fee. 30% commission on success (+ VAT for Polish residents).
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