44It should, however, be borne in mind, in the second place, that, according to the settled case-law of the Court, the concept of ‘State aid’ does not cover measures that differentiate between undertakings which, in the light of the objective pursued by the legal regime concerned, are in a comparable factual and legal situation, and are, therefore, a priori selective, where the Member State concerned is able to demonstrate that that differentiation is justified since it flows from the nature or general structure of the system of which the measures form part (see judgment of 21 December 2016, Commission v World Duty Free Group and Others, C‑20/15 P and C‑21/15 P, EU:C:2016:981, paragraph 58 and the case-law cited).
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