Case C-70/20: Judgment of the Court (Fourth Chamber) of 12 May 2021 (request for a preliminary ruling from the Oberster Gerichtshof — Austria) — YL v Altenrhein Luftfahrt GmbH (Reference for a preliminary ruling — Air transport — Montreal Convention — Article 17(1) — Air carrier liability in the event of accidents — Concept of ‘accident’ — Hard landing made within the normal operating range of an aircraft — Bodily injury allegedly sustained by a passenger during such a landing — No accident)