Commission Decision (EU) 2015/1584 of 1 October 2014 on State aid SA.23098 (C 37/07) (ex NN 36/07) implemented by Italy in favour of Società di Gestione dell'Aeroporto di Alghero So.Ge.A.AL S.p.A. and various air carriers operating at Alghero airport (notified under document C(2014) 6838)