25In that connection, it is apparent from the case-law of the Court relating to the concept of ‘extraordinary circumstances’ within the meaning of Article 5(3) of Regulation No 261/2004 that events whose origin is ‘internal’ must be distinguished from those whose origin is ‘external’ to the operating air carrier (judgment of 23 March 2021, Airhelp, C‑28/20, EU:C:2021:226, paragraph 39). That concept thus encompasses, by way of the occurrence of such ‘external’ events, those which result from the activity of the air carrier and from external circumstances which are more or less frequent in practice but which the air carrier does not control because they arise from a natural event or an act of a third party, such as another air carrier or a public or private operator interfering with flight or airport activity (see, to that effect, judgment of 23 March 2021, Airhelp, C‑28/20, EU:C:2021:226, paragraphs 40 and 41).
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