Case C-532/18: Judgment of the Court (Fourth Chamber) of 19 December 2019 (request for a preliminary ruling from the Oberster Gerichtshof — Austria) — GN, represented for legal purposes by HM v ZU, acting as administrator in the insolvency of Niki 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’ — Aircraft in flight — Spillage of a cup of coffee placed on the tray table of a seat — Bodily injuries caused to the passenger)