Each of these is a refusal this regime lets a counterparty attempt, paired with the answer to it. Reading them before you write is worth more than any amount of polish on the letter itself.
"Extraordinary circumstances"
high likelihoodThe airline asserts extraordinary circumstances without identifying them or evidencing them.
What answers it
Article 5(3) exonerates the carrier only "if it can prove" the extraordinary circumstance. The burden lies on the airline, not on you. You do not have to establish why your flight was disrupted in order to be paid. Even where an extraordinary circumstance is made out, the carrier is only excused if it also proves the disruption could not have been avoided even if all reasonable measures had been taken — which includes deploying reserve aircraft or crew, and re-routing the passenger on another airline where that was open to it. Asserting the circumstance without addressing this second limb is not a defence. Ask in writing for the specific event, its date and time, the aircraft registration, and the evidence relied on. An ADR adjudicator will expect the airline to produce it.
Regulation (EC) No 261/2004 (assimilated, UK), Art. 5 — Art. 5
"It was a technical fault"
high likelihoodThe airline treats an unserviceable aircraft as automatically extraordinary.
What answers it
A technical problem is not, as such, an extraordinary circumstance (Wallentin-Hermann, C-549/07), and nor is a spontaneous component failure on a correctly maintained aircraft (van der Lans, C-257/14). Both remain assimilated case law in the UK. Only a hidden manufacturing defect revealed by the manufacturer or a competent authority, or sabotage, will do.
Wallentin-Hermann v Alitalia, C-549/07
"It was the weather"
high likelihoodThe airline cites weather generically, often on a day when most flights operated.
What answers it
Recital 14 requires conditions "incompatible with the operation of the flight concerned". Ask for the METAR and TAF for the airport and time window, and for an explanation of why other flights operated when yours did not.
Regulation (EC) No 261/2004 (assimilated, UK), Art. 5 — Art. 5
"We have offered you a voucher"
high likelihoodThe airline offers vouchers and treats acceptance as settling the claim.
What answers it
Article 7(3) requires cash, bank transfer, bank order or cheque. Vouchers are permitted only with the signed agreement of the passenger. You have signed nothing and you decline.
Regulation (EC) No 261/2004 (assimilated, UK), Art. 7 — Art. 7
"But we re-routed you"
high likelihoodThe airline says re-routing removes the compensation entirely.
What answers it
Article 7(2) provides a 50% REDUCTION, and only where the re-routed arrival was within two, three or four hours of the original by band. Re-routing discharges the Article 8 obligation; it is not an answer to Article 7.
Regulation (EC) No 261/2004 (assimilated, UK), Art. 7 — Art. 7
"The delay was under three hours"
high likelihoodThe airline measures departure delay, or measures arrival to touchdown or on-blocks.
What answers it
The delay that counts is the one at your final destination, measured to the moment a door opened: Germanwings v Henning (C-452/13). Please state the door-open time.
Germanwings GmbH v Ronny Henning, C-452/13
"That was our partner airline, not us"
medium likelihoodThe marketing and operating carriers point at each other.
What answers it
Article 2(b) defines the operating air carrier as the one that performs the flight, and every obligation falls on it. If you operated the flight you owe the compensation, whatever code was on the ticket.
Regulation (EC) No 261/2004 (assimilated, UK), Art. 2 — Art. 2
"The CAA has closed your case"
medium likelihoodThe airline points to the CAA having taken no action, as though that were a determination that nothing is owed.
What answers it
The CAA supervises compliance; it does not adjudicate individual claims and has no power to order payment. Its closing a case decides nothing about your entitlement. The bodies that can decide are the approved ADR scheme and the court.
CAA — how the CAA can help