Case C-27/13: Order of the Court of 4 April 2014 (request for a preliminary ruling from the Schleswig-Holsteinisches Oberlandesgericht (Germany)) — Flughafen Lübeck GmbH v Air Berlin plc & Co. Luftverkehrs KG (Article 99 of the Rules of Procedure — State aid — Articles 107 TFEU and 108 TFEU — Advantages granted by a public undertaking operating an airport to a low-cost airline — Decision to open the formal investigation procedure — Obligation of the courts of the Member States to follow the Commission’s assessment in that decision as regards the existence of aid)