Joined Cases C-174/19 P and C-175/19 P: Judgment of the Court (First Chamber) of 6 October 2021 — Scandlines Danmark ApS, Scandlines Deutschland GmbH v European Commission, Kingdom of Denmark, Föreningen Svensk Sjöfart, Naturschutzbund Deutschland (NABU) eV (C-174/19 P), Stena Line Scandinavia AB v European Commission, Kingdom of Denmark, Föreningen Svensk Sjöfart (C-175/19 P) (Appeal — Action for annulment — State aid — Public financing of the Fehmarn Belt fixed rail-road link — Individual aid — Notified aid declared compatible with the internal market — Execution of an important project of common European interest — Decision not to raise any objections — Monopoly — Distortion of competition and effect on trade)