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In those circumstances, the Supremo Tribunal Administrativo (Supreme Administrative Court) decided to stay the proceedings and to refer the following questions to the Court of Justice for a preliminary ruling: ‘(1) Does EU law, in particular Articles 49 and 54 TFEU and the principles set out in those articles, in a procedure relating to the process for the indirect reprivatisation of the share capital in a publicly owned company engaged in the activity of air transport, permit the documents establishing that procedure to include the requirement to keep the headquarters and effective management of that company in the Member State where it was incorporated as a criterion for selecting the purchases proposed by the potential investors and for choosing the successful offers? (2) Does EU law, in particular Articles 56 and 57 TFEU and the principles set out in those articles, and the principles of non-discrimination, proportionality and necessity, in a procedure relating to the process for the indirect reprivatisation of the share capital in that company, permit the documents establishing that procedure to include the requirement to comply with the public service obligations on the part of the purchasing entity as a criterion for selecting the purchases proposed by the potential investors and for choosing the successful offers? (3) Does EU law, in particular Articles 56 and 57 TFEU and the principles set out in those articles, in a procedure relating to the process for the indirect reprivatisation of the share capital in that company, permit the documents establishing that procedure to include the requirement to maintain and develop the current national hub on the part of the purchasing entity as a criterion for selecting the purchases proposed by the potential investors and for choosing the successful offers? (4) As regards the activity carried on by that company whose share capital is being disposed of under the reprivatisation procedure, must it be regarded as a service in the internal market subject to the provisions of Directive [2006/123] due to the presence of the exception laid down in Article 2(2)(d) of that directive relating to services in the field of transport, and consequently, does that procedure also have to be shown to be subject to that directive? (5) If the answer to [the fourth] question is in the affirmative, do the provisions of Articles 16 and 17 of that directive, in a procedure relating to the process for the indirect reprivatisation of the share capital in that company, permit the documents establishing that procedure to include the requirement to comply with the public service obligations on the part of the purchasing entity as a criterion for selecting the purchases proposed by the potential investors and for choosing the successful offers? (6) If the answer to [the fourth] question is in the affirmative, do the provisions of Articles 16 and 17 of that directive, in a procedure relating to the process for the indirect reprivatisation of the share capital in that company, permit the documents establishing that procedure to include the requirement to maintain and develop the current national hub on the part of the purchasing entity as a criterion for selecting the purchases proposed by the potential investors and for choosing the successful offers?’