"Extraordinary circumstances" is the phrase you will encounter more than any other when an airline rejects your compensation claim. It is the primary legal defence available to carriers under EC261, and it is invoked far more often than it legitimately applies. Understanding what this term actually means (as defined by courts, not by airline customer service departments) is essential to evaluating whether a rejection is valid or whether it is worth challenging.
Key takeaways
What counts and what doesn't
- Severe weather, ATC strikes, security threats, and airspace closures are genuinely extraordinary
- Technical faults, crew issues, and airline staff strikes are NOT extraordinary — courts have ruled repeatedly
- The airline must prove both the cause AND that it took all reasonable measures
- If the airline's explanation is vague, challenge it — most rejections on these grounds don't hold up
The legal standard
For an event to qualify as extraordinary circumstances under EC261, it must meet two cumulative conditions. First, the event must not be inherent to the normal exercise of the airline's activities. Second, it must be beyond the airline's actual control. Both conditions must be met. An event that is within the airline's normal operations, even if inconvenient or expensive, does not qualify. And an event that might be unusual but could have been mitigated by reasonable measures may not qualify either.
Recital 14 — Extraordinary circumstances defined
"Such circumstances may, in particular, occur in cases of political instability, meteorological conditions incompatible with the operation of the flight concerned, security risks, unexpected flight safety shortcomings and strikes that affect the operation of an operating air carrier." — Regulation (EC) No 261/2004, Recital 14
Crucially, the airline bears the burden of proof. It is not enough to simply claim extraordinary circumstances; the airline must demonstrate specifically what happened and why it could not have been avoided.
What is genuinely extraordinary
The following are generally accepted by courts and enforcement bodies as legitimate extraordinary circumstances:
- Severe weather that makes flying genuinely unsafe (storms, heavy snow, dense fog, volcanic ash)
- Air traffic control restrictions or strikes by ATC staff
- Political instability, war, or civil unrest affecting airspace or airports
- Security threats including bomb scares and airport evacuations
- Government-imposed flight bans or airspace closures
The common thread is that these are events no airline could prevent or mitigate, regardless of how well-managed it is. A volcanic ash cloud does not discriminate between carriers. An air traffic control strike affects all flights equally.
What courts have ruled is NOT extraordinary
This is where the real value lies for passengers, because airlines frequently invoke extraordinary circumstances for events that European courts have explicitly ruled do not qualify.
- Technical or mechanical faults — aircraft maintenance is core airline business
- Crew illness or scheduling problems — airlines should have standby arrangements
- Staff strikes by the airline's own employees — an inherent risk of running a business
- Late arrival of inbound aircraft (knock-on delays) — an operational matter
- Overbooking — a deliberate commercial decision
- Minor weather within operating limits — light rain, moderate wind
- Operational decisions like merging flights or swapping aircraft
Technical faults are the most commonly contested category. Airlines argue that a mechanical failure is unforeseeable and beyond their control. Courts have consistently disagreed. Maintaining aircraft is a core part of running an airline. Technical problems arise from the normal operation of the fleet and are therefore inherent to the activity, not extraordinary. The only exception might be a defect attributable to a manufacturing fault that was undetectable through normal maintenance, a very high bar to clear.
Crew issues receive similar treatment. An airline is expected to have contingency plans for crew illness, including standby crews at major bases. A single crew member calling in sick is not extraordinary; it is a routine staffing event that a well-run airline should be able to manage.
The "all reasonable measures" test
Even when an event genuinely qualifies as extraordinary, the airline is not automatically off the hook. It must also demonstrate that it took "all reasonable measures" to avoid or minimise the disruption. If a flight was cancelled due to a snowstorm but the airline failed to rebook passengers on available flights with other carriers, or failed to arrange hotel accommodation when it was available, the extraordinary circumstances defence may still fail.
This second limb of the test is often overlooked. An airline might prove that the original cause was extraordinary, but if it then handled the aftermath poorly (failing to rebook passengers promptly, not offering care, or not communicating updates), this can undermine the defence.
Two-part test
Airlines must prove both (1) that the disruption was caused by extraordinary circumstances and (2) that they took all reasonable measures to avoid or minimise the impact. Failing on either point means compensation is owed.
What to do if an airline claims extraordinary circumstances
Not sure if extraordinary circumstances apply?
Enter your flight details. We'll check the airline's explanation against independent data.
DEPARTURES
If your claim is rejected on extraordinary circumstances grounds, do not accept it at face value. Ask the airline to provide specific evidence of what happened. If the explanation is unsatisfactory, challenge the rejection. Ask for not just a general statement, but details of the actual event, when it occurred, and how it specifically affected your flight. If the explanation is vague, generic, or does not match independently verifiable information (weather data, air traffic control records), you have grounds to challenge it.