President of the same will fall to the Secretary of State for Infrastructure, Transport and Housing. Subsidiaries Aena ENAIRE owns 51% of Aena (Aeropuertos Españoles y Navegación Aérea), a network of 46 airports in Spain and abroad. Aena operates all the airports of public interest in Spain and some air bases on a mixed basis with the Armed Forces of Spain. Also worth noting are Ceuta Heliport and Algeciras Heliport, the only heliports of the network. Ineco As of this writing ENAIRE holds 45.85% of public shares in INECO ("Transport Engineering and Economics") with the remainder of the shares distributed between Renfe Operadora (12.78%) and Adif (41.37%). INECO specializes in conducting 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 many others internationally. Crida With the legal personality of an Economic Interest Grouping, ENAIRE (66.66%), Ineco (16.67%) and the Polytechnic University of Madrid (16.67%), have constituted the "ATM Research, Development and Innovation Reference Centre" (Crida) to engage in R&D+I activities in the area of ATM aimed at improving performance (in particular safety, capacity and economic and environmental efficiency) of the Spanish air navigation system, as an integral part of a global system. In addition, ENAIRE holds stakes in: EMGRISA (0.08%), Grupo Navegación por Satélite Sistemas y Servicios S.L. (19.3%), GroupEAD (36%) and Barcelona Regional (11.76%). See also Aeronautical Information Service Aviation safety Civil Air Navigation Services Organization Eurocontrol List of airports in Spain References External links Official website of ENAIRE Official website of Aena Agencia Estatal de Seguridad Aérea Ministerio de Fomento website Flight information in Spain ENAIRE Annual Report Airport operators Transport companies of Spain Government-owned companies of Spain Air navigation service providers IBEX 35