20Since the provisions of that convention have been an integral part of the European Union legal order from the date on which the convention entered into force, the Court has jurisdiction to give a preliminary ruling concerning its interpretation (see, by analogy, Case 181/73 Haegeman [1974] ECR 449, paragraphs 2, 4 and 5, and, in relation to the Montreal Convention, Case C-344/04 IATA and ELFAA [2006] ECR I-403, paragraph 36, and Case C-549/07 Wallentin-Hermann [2008] ECR I-11061, paragraph 28).
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