29That air carrier must establish that, even if it had deployed all its resources in terms of staff or equipment and the financial means at its disposal, it would clearly not have been able, unless it had made intolerable sacrifices in the light of the capacities of its undertaking at the relevant time, to prevent the extraordinary circumstances with which it was confronted from leading to the cancellation of the flight or its delay equal to or in excess of three hours in arrival (see, to that effect, judgments of 19 November 2009, Sturgeon and Others, C‑402/07 and C‑432/07, EU:C:2009:716, paragraph 61, and of 12 May 2011, Eglītis and Ratnieks, C‑294/10, EU:C:2011:303, paragraph 25).