Korean Air Lines Co., Ltd., operating as Korean Air, is both the flag carrier and the largest airline of South Korea, with global headquarters located in Seoul. Korean Air's international passenger division and related subsidiary cargo division together serve 130 cities in 45 countries, while its domestic division serves 20 destinations. It is among the top 20 airlines in the world in terms of passengers carried and is also the top-ranked international cargo airline. Incheon International Airport serves as Korean Air's international hub. Korean Air also maintains a satellite headquarters campus at Incheon. Korean Air's main global headquarters campus, the Korean Air Operations Center , is located in Gonghang-dong, Gangseo-gu in Seoul. Korean Air also maintains a domestic office campus at Gimpo International Airport in Seoul. Korean Air's lesser domestic hubs are based at Jeju International Airport, Jeju and Gimhae International Airport, Busan. The maintenance facilities are located in Gimhae International Airport.