Seoul Gimpo International Airport

Seoul Gimpo International Airport carries the IATA code GMP — the three letters printed on boarding passes and baggage tags — and the ICAO code RKSS, used in flight plans and by air traffic control. It serves Seoul, South Korea.

IATA codes are assigned by the International Air Transport Association for passenger-facing use; the four-letter ICAO code encodes region and country and belongs to the operational side of aviation.