Judgment of the Court of First Instance (Seventh Chamber) of 4 March 2009 - Tirrenia di Navigazione and Others v Commission (Joined Cases T-265/04, T-292/04 and T-504/04) State aid - Maritime transport - Subsidies paid by the Italian authorities to regional undertakings - Decision declaring the aid in part compatible and in part incompatible with the common market - Action for annulment - Admissibility - Legal interest in bringing proceedings - New or existing aid - Duty to state reasons - Article 4(3) of Regulation (EEC) No 3577/92 1. Actions for annulment - Interest in bringing proceedings - Action by the recipient of State aid against a Commission decision declaring it compatible with the common market (Arts 230 EC, fourth para., and 233 EC) (see paras 63-72) 2. Acts of the institutions - Statement of reasons - Obligation - Scope - Commission decision on State aid (Arts 87 EC and 253 EC) (see paras 98-99, 101-103) 3. Commission - Principle of collegiality - Scope (Art. 253 EC) (see paras 107-108) 4. State aid - Existing aid and new aid - Definition (Art. 88(3) EC) (see paras 123-124, 126-127) 5. State aid - Existing aid and new aid - Payments in favour of shipping companies providing, in the context of public service contracts, regular services to and from islands (Art. 88(1) and (3) EC; Council Regulation No 3577/92, Art. 4(3)) (see paras 143-144) 6. Actions for annulment - Judgment annulling a measure - Scope - Absolute authority of res judicata (see paras 159-160) Re: APPLICATIONS for annulment in part of Commission Decision 2005/163/EC of 16 March 2004 on the State aid paid by Italy to the Adriatica, Caremar, Siremar, Saremar and Toremar shipping companies (Tirrenia Group) (OJ 2005 L 53, p. 29). Operative part The Court: 1. In Cases T-265/04 and T-292/04, annuls Commission Decision 2005/163/EC of 16 March 2004 on the State aid paid by Italy to the Adriatica, Caremar, Siremar, Saremar and Toremar shipping companies (Tirrenia Group); 2. In Case T-504/04, declares that the action has become devoid of purpose; 3. In Case T-265/04, orders the Commission to bear its own costs and to pay those of Tirrenia di Navigazione SpA; 4. In Case T-292/04, orders the Commission to bear its own costs and to pay those of Caremar SpA, Siremar SpA, Saremar SpA and Toremar SpA; 5. In Case T-504/04, orders the Commission to bear its own costs and to pay those of Navigazione Libera del Golfo SpA; 6. In Case T-504/04, orders the Italian Republic and Caremar to bear their own costs.