Extraordinary circumstances: the excuse, and its limits

Extraordinary circumstances is the phrase an airline reaches for when it would rather not pay you. In law it is a narrow test, not a general excuse. The cause has to sit outside the airline's control, and no reasonable step could have saved the flight. The airline must prove both halves. Most refusal letters prove neither.

What the regulation actually says

Regulation 261/2004 fixes a payment of €250 to €600 for a cancellation, a long delay or a denied boarding. Article 5(3) gives the airline one way out of it. The airline escapes the payment when extraordinary circumstances caused the disruption and no reasonable measure could have avoided it.

That sentence carries two tests, not one:

• The cause sat outside the airline's control. A storm, closed airspace, a security alert, a bird strike.
• Nothing reasonable would have saved the flight. A spare aircraft, a standby crew, a seat bought on another carrier.

An airline that passes the first test and fails the second still pays. The second half is where most refusals fall apart, and almost no rejection letter mentions it.

What counts as extraordinary circumstances, and what does not

Courts across Europe have spent twenty years drawing this line. The pattern is clearer than airlines let on.

Usually extraordinary:

• Severe weather at the departure or the arrival airport
• Air-traffic control restrictions and closed airspace
• Political instability, terrorism alerts and security incidents
• A strike by people who do not work for the airline, such as airport security or controllers
• A bird strike, which the Court of Justice placed outside the carrier's control

Usually not extraordinary:

• A technical fault found during maintenance or before departure
• A crew shortage, including sickness and rosters that ran out of hours
• A knock-on delay from the same aircraft's earlier flight
• A strike by the airline's own pilots or cabin crew
• Overbooking

Why "the plane broke" is not enough

Technical fault compensation claims are the ones airlines refuse most often and lose most often. This is the refusal passengers meet most, and it is the weakest one. In Wallentin-Hermann the Court of Justice held that a technical problem found in maintenance is part of running an airline. Machines wear out. Planning for that is the carrier's job, not the passenger's risk.

One exception exists and it is narrow. A hidden manufacturing defect announced by the maker, or an act of sabotage, can qualify. An engine part that failed on a Tuesday does not. If your letter says "unexpected technical issue" and stops there, it has not met the test.

Our case law summary sets out the judgments in full, and the delay compensation guide explains how the money works once the excuse falls away.

Does a weather delay ever pay?

Sometimes, and the reason surprises people. Weather itself sits outside the airline's control. What the airline does next often does not.

Say fog closes an airport for two hours in the morning. Every carrier there meets the same fog. One recovers by lunchtime and another cancels your evening flight, because the aircraft is now in the wrong city and the crew has run out of hours. The fog was extraordinary. The thin recovery plan was a choice.

That is the argument worth making. Ask which flights the airline did operate that day, and how yours differed.

What the airline owes you either way

Here is the part airlines rarely volunteer. Even when the excuse holds and no compensation is due, the duty of care survives untouched.

From two hours of waiting the airline must give you food and drink in proportion to the delay. It must give you two phone calls or emails. If it holds you overnight it must give you a hotel and the transport to reach it. A genuine storm removes the compensation and changes none of this.

If the airline hands you nothing, buy what you reasonably need, keep every receipt, and claim the money back. Our stranded guide covers what counts as reasonable.

How to answer a refusal letter

If an airline refused compensation in a single short paragraph, it has almost certainly skipped the second test. You do not need a lawyer to push back. You need to make the airline do the work that the law puts on it.

1. Ask for the specific cause. Not "operational reasons" — the actual thing that happened, in writing.
2. Ask what it did about it. Which aircraft were free, which crews, and whether it looked for a seat on another airline.
3. Point at the second test. Say plainly that an extraordinary cause alone does not settle the claim, and that you want its evidence on reasonable measures.
4. Give a deadline. Fourteen days is fair, and it is what most regulators expect.
5. Escalate. The national enforcement body of the country you flew from reviews refusals for free.

Airlines answer differently when a letter shows that the passenger knows both halves of the test.

The burden sits with the airline

The most useful fact in this whole area is about who proves what. You never have to show the cause was ordinary. The airline has to show it was extraordinary, and that it took every reasonable step anyway. A sentence naming a cause is an assertion, not proof.

That is why so many refused claims succeed on a second attempt. Nothing about the flight changed. The passenger simply asked the airline to meet a standard it had skipped.

To check a flight against its record rather than against a letter, our free flight check reads the times, the distance and the notice period in about two minutes.