Case C-379/18: Judgment of the Court (Fourth Chamber) of 21 November 2019 (request for a preliminary ruling from the Bundesverwaltungsgericht — Germany) — Deutsche Lufthansa AG v Land Berlin (Reference for a preliminary ruling — Air transport — Directive 2009/12/EC — Articles 3 and 6 — Article 11(1) and (7) — Airport charges — Protection of airport users’ rights — Whether it is possible for the airport managing body to agree charges lower than those approved by the independent supervisory authority — Remedies available to an airport user — Collateral challenge before a civil court giving judgment on the basis of equitable criteria)