Base Aérea de Morón Curiosity · Morón de la Frontera, Campiña de Marchena y Morón, Seville The air base, built from 1940 onward and expanded until 1960, came to host the United States Air Force under the 1953 Madrid Pacts, and remains operational as a joint Spanish-American base. 1940 (inicio de la construcción); 1953 (Convenios de Madrid) Photo: Gons (CC BY-SA 4.0) What to see and do in Morón de la Frontera