Judgment of the Court (Third Chamber) of 6 July 2023.#DB v Austrian Airlines AG.#Request for a preliminary ruling from the Oberster Gerichtshof.#Reference for a preliminary ruling – Air transport – Montreal Convention – Article 17(1) – Liability of air carriers for death or injury sustained by passengers – Concept of ‘accident’ – Bodily injuries aggravated by first aid administered following an accident that took place on board an aircraft.#Case C-510/21.