Case T-447/18: Judgment of the General Court of 29 September 2021 — TUIfly v Commission (State aid — Agreements concluded by Kärntner Flughafen Betriebsgesellschaft with airlines Hapag Lloyd Express and TUIfly — Airport services — Marketing services — Decision declaring the aid incompatible with the internal market and ordering its recovery — Advantage — Private investor test — Article 41 of the Charter of Fundamental Rights — Right of access to the file — Right to be heard)