Joined Cases C-331/20 P and C-343/20 P: Judgment of the Court (Second Chamber) of 17 November 2022 — Volotea SA (C-331/20 P), easyJet Airline Co. Ltd (C-343/20 P) v European Commission (Appeal — State aid — Article 107(1) TFEU — European Commission decision on compensation to Sardinian airports for public service obligations — Existence of unlawful State aid incompatible with the internal market, granted by the Italian Republic to airlines through airport operators — Concept of ‘State aid’ — Proof of the existence of an advantage — Determination of the amount — Market economy operator principle — Applicability and application — Test of the private acquirer of goods or services — Conditions — Burden of proof)