What Are “Extraordinary Circumstances” Under EU261?

What does “extraordinary circumstances” mean in EU261?

EU Regulation 261/2004 entitles passengers to compensation of €250–€600 for delays of 3+ hours — unless the delay was caused by “extraordinary circumstances which could not have been avoided even if all reasonable measures had been taken.”

The label alone does not settle a claim. The specific event, whether it was inherent in normal airline activity, and the reasonable measures taken all matter. EU court decisions provide guidance on particular fact patterns.

✅ What genuinely counts as extraordinary circumstances

These are situations outside the airline's operational control that cannot reasonably be mitigated:

• Extreme and unusual weather — A once-in-a-decade blizzard closing an airport qualifies. Routine fog, rain, or winter weather that airlines should plan for does NOT.
• Air Traffic Control strikes — Third-party ATC industrial action (e.g. French ATC strike grounding European traffic). Note: the airline's own staff striking is a separate issue.
• Airport security incidents — A bomb threat causing airport evacuation and closure that is entirely outside the airline's knowledge or control.
• Political instability / airspace closure — A sudden conflict-related closure of a country's airspace (e.g. Belarus airspace closure in 2021).
• Bird strikes causing structural damage — A bird strike that genuinely disables the aircraft goes beyond routine maintenance.

❌ Grounds EU case law has treated as within the airline's control

Where a claim is refused on one of the grounds below, the European Court of Justice has issued rulings that are directly relevant:

• Technical / mechanical faults — The ECJ ruled in Wallentin-Hermann v Alitalia (C-549/07) that technical problems are inherent in airline operations. Unless caused by a hidden manufacturing defect, aircraft faults are NOT extraordinary.
• Crew shortages and scheduling — Running out of available crew or breaching crew duty time limits is an operational management issue within the airline's control.
• Late arriving aircraft — If the aircraft was late on the previous sector, that rotational delay is the airline's operational responsibility.
• The airline's own staff strikes — The ECJ ruled in Airhelp v Scandinavian Airlines (C-28/20) that a strike by the airline's own pilots — even a wildcat strike — does NOT automatically constitute extraordinary circumstances.
• IT system failures — Software outages affecting check-in or operations are within the airline's organisational sphere.
• Routine winter weather — Standard snow or fog that airports and airlines regularly prepare for and mitigate is not extraordinary, even if inconvenient.

The “all reasonable measures” test

Even where extraordinary circumstances genuinely apply, the airline must also prove it took all reasonable measures to avoid the delay. For example:

• • Did the airline try to reroute passengers?
• • Did the airline have spare aircraft available?
• • Could the airline have used a different crew?

Airlines that fail to take reasonable mitigation steps lose their extraordinary circumstances defence, even if the underlying event was genuinely unusual.

Key European Court of Justice rulings

• Wallentin-Hermann v Alitalia (C-549/07, 2008) — Technical faults are not extraordinary circumstances. Airlines must demonstrate the fault was caused by events outside normal airline operations.
• Germanwings GmbH v Henning (C-452/13, 2014) — Defines when a flight counts as having arrived for EU261 purposes: the arrival time is the moment at least one aircraft door opens and passengers are permitted to leave, not touchdown or arrival on stand. This is what fixes the length of your delay.
• Airhelp v Scandinavian Airlines (C-28/20, 2021) — A wildcat pilot strike called in response to airline restructuring is an inherent part of the airline's business and not extraordinary.

What to do if your claim is refused citing extraordinary circumstances

1. Ask the airline in writing to provide the specific extraordinary circumstance and evidence for it.
2. Check flight tracking data (e.g. FlightAware, Flightradar24) to see the actual delay cause recorded.
3. Check the relevant National Enforcement Body or dispute-resolution guidance; remedies and procedures vary.
4. Consider independent legal advice if the evidence or applicable rules are disputed.