Judgment of the Court (Fourth Chamber) of 14 September 2023.#Land Rheinland-Pfalz v Deutsche Lufthansa AG.#Appeal – State aid – Aviation sector – Operational aid granted by the Federal Republic of Germany to Frankfurt-Hahn airport – Article 108 TFEU – Decision not to open the formal investigation procedure – Action for annulment – Status as an interested party – Safeguard of procedural rights.#Case C-466/21 P.