Joined Cases T-415/05, T-416/05 and T-423/05: Judgment of the General Court of 13 September 2010 — Greece and Others v Commission (State aid — Aviation Sector — Aid linked to the restructuring and privatisation of the Greek national airline — Decision declaring the aid incompatible with the common market and requiring its recovery — Financial continuity between two companies — Identification of the effective recipient of aid for the purposes of its recovery — Criterion of the private operator — Compatibility of the aid with the common market — Obligation to state reasons for the decision)