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Buenos Aires' Ezeiza international airport is the only one in Latin America that has seen passenger numbers fall since 2010, local daily Clarín reported, citing Center for Aviation (CAPA) figures.
Argentina's former "main" gateway handled 8.53mn travelers in 2013, a 2.9% drop compared with 2010.
But its counterpart Aeroparque, also located in the city, experienced a 26.4% traffic boost over the three-year period, totaling 9.5mn passengers in 2013 and claiming the crown as the busiest airport in Argentina.
Poor infrastructure makes Ezeiza an expensive terminal for operators, resulting in a reduction in the frequency of flights, aviation expert Franco Rinaldi told the paper.
Regionally, Brazil's Guarulhos airport, in São Paulo, saw the biggest traffic increase, totaling 36mn passengers in 2013, up 33.9% compared with 2010.
Colombia followed closely with a 32% traffic boost at El Dorado airport in Bogotá, totaling 25mn passengers in 2013.
Latin America will invest billions of dollars next year to upgrade, expand and build new airports in the region, which is among the fastest growing in the world in terms of airport traffic, according to BNamericas' latest Intelligence Series report Outlook: Big Promises for 2015.