43Furthermore, the obligation on the operating air carrier to offer passengers whose flight has been cancelled the various options referred to in Article 8(1) of that regulation presupposes that it provides those passengers with all the information concerning the rights deriving from that provision so that they can effectively exercise their rights in the event of cancellation (see, to that effect, judgments of 29 July 2019, Rusu, C‑354/18, EU:C:2019:637, paragraphs 53 and 54, and of 21 December 2021, Azurair and Others, C‑146/20, C‑188/20, C‑196/20 and C‑270/20, EU:C:2021:1038, paragraphs 99 and 100).
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