the aircraft moving around Spanish airspace obtain the utmost security, fluidity, efficiency and punctuality. The preparation and approval of different kinds of projects, as well as the implementation and management of investment control. Evaluation of the needs and proposals for new infrastructure, as well as possible modifications to the structure of the airspace. Participation in specific aeronautical training, subject to the concession of official licenses. ENAIRE provides air navigation services using the following equipment and installations: 5 control centres (Barcelona, Canary Islands, Madrid, Palma de Mallorca and Seville). 21 control towers (Adolfo Suárez-Madrid Barajas, Almería, Asturias, Barcelona-El Prat, Bilbao, Girona-Costa Brava, Gran Canaria, Federico García Lorca Granada-Jaén, Palma de Mallorca, Málaga-Costa del Sol, Melilla, Menorca, Reus, San Sebastián, Santiago de Compostela, Seve Ballesteros-Santander, Tenerife Norte, Tenerife Sur and Vitoria). 136 radio aids supporting navigation en route. 50 radio aids providing airport guidance. 49 en route surveillance systems, in airport proximities and on the ground at airfields. 18 communications centres to cover Ground/Ground and Ground/Air communications. 83 communications nodes for data transmission. ENAIRE performs the national and international operational coordination of the Spanish air traffic management network through efficient airspace management, taking into account respect for the environment and the needs of users. These services are provided from the five regional directorates of ENAIRE: Centre-North, East, South, Canary Islands and Balearic Islands, whose headquarters lie respectively in the control centres (ACC) of Madrid, Barcelona, Seville, Gran Canaria and Palma de Mallorca. History In 1958, under the Act of 26 December 1958, the National Airports Executive was created as a corporation of public law of an autonomous nature, attached to the Air Ministry, which, as a consequence of the Act of 26 December 1958, on the Juridical Regime for Autonomous State Entities, became the Autonomous National Airport Authority (OAAN). As a consequence of the Air Navigation Act, the Autonomous National Airport Authority (OAAN) was created, attached to the Air Ministry and dependent on the Subsecretariat for Civil aviation. In 1963 the Subsecretariat for Civil aviation was created within the Air Ministry (still a military authority), to which the OAAN (Autonomous National Airport Authority) was attached. Spain signed an agreement with Eurocontrol as an associate state in 1972. The Autonomous National Airport Authority, dependent upon the Air Ministry, signed a convention with Eurocontrol in consideration for the use of the Air Navigation Facilities Network. In 1977, the creation of the Ministry for Transport