Case C-160/19 P: Judgment of the Court (Second Chamber) of 10 December 2020 — Comune di Milano v European Commission (Appeal — State aid — Air transport sector — Groundhandling services at Milan-Linate (Italy) and Milan-Malpensa (Italy) airports — Capital injections made by the operator of those airports into its wholly owned subsidiary providing those services — Public shareholding of the operator — Decision declaring those State aid measures unlawful and incompatible with the internal market — Article 107(1) TFEU — Concepts of ‘State resources’, ‘measure imputable to the State’ and ‘economic advantage’ — Private operator principle — Private investor test — Burden of proof — Complex financial assessments — Intensity of judicial review — Distortion of the evidence)