Ilopango International Airport — San Salvador, El Salvador

ILS refers to Ilopango International Airport, located just east of San Salvador and historically El Salvador's principal airport before commercial traffic shifted to the newer Comalapa International Airport (SAL) in 1980. Since then, Ilopango has transitioned to a role supporting general aviation, flight schools, military operations, and government aircraft, alongside a Salvadoran Air Force base on its grounds. During the Salvadoran civil war it held strategic military importance. Today ILS sees light aircraft, helicopters, and occasional cargo or charter flights rather than scheduled airline service. Its proximity to the capital keeps it relevant for private aviation and pilot training despite losing its status as the country's main international gateway decades ago.