Case C-570/19: Judgment of the Court (Fourth Chamber) of 2 September 2021 (request for a preliminary ruling from the High Court (Ireland) — Ireland) — 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)