Case C-28/19: Judgment of the Court (Seventh Chamber) of 23 April 2020 (request for a preliminary ruling from the Consiglio di Stato — Italy) — Ryanair Ltd, Autorità Garante della Concorrenza e del Mercato — Antitrust v Autorità Garante della Concorrenza e del Mercato — Antitrust, Ryanair Ltd, Ryanair DAC (Reference for a preliminary ruling — Transport — Air services — Regulation (EC) No 1008/2008 — Article 23(1) — Indication of the final price to be paid — Online passenger check-in fees — VAT — Administrative fees for purchases made by means of a credit card other than that approved by the air carrier — Unavoidable and foreseeable elements of the final price to be paid — Optional price supplements — Concept)