Judgment of the Court (Fourth Chamber) of 2 September 2021.#Irish Ferries Ltd v National Transport Authority.#Reference for a preliminary ruling – Maritime transport – Rights of passengers when travelling by sea and inland waterway – Regulation (EU) No 1177/2010 – Articles 18 and 19, Article 20(4), and Articles 24 and 25 – Cancellation of passenger services – Late delivery of a vessel to the carrier – Notice given prior to the originally scheduled date of departure – Consequences – Right to re-routing – Procedures – Payment of the additional costs – Right to compensation – Calculation – Concept of ticket price – National body responsible for the enforcement of Regulation No 1177/2010 – Competence – Concept of a complaint – Assessment of validity – Articles 16, 17, 20 and 47 of the Charter of Fundamental Rights of the European Union – Principles of proportionality, legal certainty and equal treatment.#Case C-570/19.