“…Such information is important in assessing uncertainties and risks of future investments in airport infrastructure in the country. Attention should also be paid here to the specific concentration and dispersal mechanisms behind traffic development in multi-airport regions (De Neufville, 1995;Derudder et al, 2010), such as the multi-airport system in Catalonia (Barcelona, Girona, Reus, Lleida 15 ), in Galicia (Santiago de Compostela, Vigo, A Coruña), in the Basque Country (Bilbo, Donostia-San Sebastián, Vitoria-Gasteiz), in Valencia and Murcia (Valencia, Alicante, Murcia), and in Andalucía (Sevilla, Málaga, Jerez de la Frontera, Granada, Almería).…”