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ENAIRE also holds shares in the company INECO (an acronym for "Transport Engineering and Economics") (45.85%). The remainder of the shares are distributed between Renfe Operadora (12.78%) and Adif (41.37%). INECO is specialized in carrying out studies and projects linked to the transport and telecommunications sector. Created more than forty years ago, it has participated in all the major infrastructure projects for airports, railways and roads undertaken in Spain, and in many others internationally.