FSX/Prepar3D Scenery--Managua Photoreal. Augusto Cesar Sandino International Airport (Spanish: Aeropuerto Internacional Augusto Cesar Sandino) (IATA: MGA, ICAO: MNMG) is the main airport in Managua, Nicaragua. Inaugurated as Las Mercedes Airport in 1968 it was later renamed Augusto Cesar Sandino International Airport during the Sandinista regime in 1980s and again in 2001 to Managua International Airport by then president Arnoldo AlemAin. Its name was changed once more in February 2007 to its current name by President Daniel Ortega in honor of Nicaragua's national hero, Augusto Cesar Sandino. By Fernando Angel Gonzalez.