As one of two major airlines in South Korea, Asiana Airlines (IATA: OZ; ICAO: AAR) operates flights to four continents. The airline, which is based in Seoul, flies to destinations within Korea and across Asia, as well as Oceania, Europe and North America. Asiana has a domestic operations hub at Seoul's Gimpo International Airport (GMP) and an international hub at Incheon International Airport (ICN). It has five classes of passenger service—First Suite Class, First Class, Business Smartium Class, Business Class and Travel Class. Aircraft configuration varies from route to route. Asiana is part of the Star Alliance.