Managua's previous airport, Xolotlan Airport, which was located about 2 mi (3.2 km) east of Managua, built in 1915, and it quickly became too small for Managua's airline service growth. In 1942, the Nicaraguan Government and Pan American Airways signed a contract to construct an airport by Las Mercedes Country Estate. Las Mercedes was further upgraded, re-designed to handle Boeing 707 aircraft, and re-inaugurated in July 1968 by Anastasio Somoza Debayle. In the early 1970s, Las Mercedes was expanded to more modern standards; this included four health inspectors, eight immigration officers, and ten customs inspectors. It was considered fully equipped, having air conditioning, background music, loudspeakers, and conveyor belts for baggage handling. It also had a restaurant on its upper floor where visitors and travelers could see airport movement. The expanded airport could serve three aircraft at once. By 1975, LANICA, Pan Am, KLM, TACA Airlines, Sahsa, Avianca, Iberia, SAM, TAN, Varig, and other carriers flew into Las Mercedes. When the Sandinistas took power, the airport was named after Augusto César Sandino, a Nicaraguan revolutionary and guerrilla leader, after whom the Sandinista movement is named. The Sandinistas, however, did not maintain the airport, and it began to deteriorate until it was expanded and remodeled in 1996, which installed two new boarding bridges. The airport was renamed "Managua International Airport" in 2001 by then President Arnoldo Alemán and renamed again in 2007 to its current name by President Daniel Ortega. In mid-2007, President Daniel Ortega renamed the airport in honor of Sandino. Nicaraguan artist Róger Pérez de la Rocha has created two large portraits of Augusto César Sandino and Rubén Darío; both of them lie in the lobby. Las Mercedes served as a hub for many of Nicaragua's flag carriers, such as LANICA (until 1978), Aeronica (1981–1992), and NICA (1992–2004). When NICA became a member of Grupo TACA during the 1990s, the number of important connections to the rest of Latin America from which ACS grew considerably. According to EAAI (Empresa Administradora de Aeropuertos Internacionales), ACS is the most modern airport in Central America and the 4th safest in the world. It is located just 11 km (7 mi) from Managua's downtown, has a runway that measures 8,015 ft (2,443 m) in length, and is at an elevation of 194 ft (59 m).