Antonio B. Won Pat International Airport

Antonio B. Won Pat International Airport carries the IATA code GUM — the three letters printed on boarding passes and baggage tags — and the ICAO code PGUM, used in flight plans and by air traffic control. It serves Hagåtña, Guam.

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.