108In the main proceedings, those principles of customary international law are relied upon, in essence, in order for the Court to determine whether the European Union had competence, in the light thereof, to adopt Directive 2008/101 in that it extends the application of Directive 2003/87 to aircraft operators of third States whose flights which arrive at and depart from an aerodrome situated in the territory of a Member State of the European Union are carried out in part over the high seas and over the third States’ territory.
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