Samui International Airport

Samui International Airport carries the IATA code USM — the three letters printed on boarding passes and baggage tags — and the ICAO code VTSM, used in flight plans and by air traffic control. It serves Na Thon (Ko Samui Island), Thailand.

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.