Hihifo Airport carries the IATA code WLS — the three letters printed on boarding passes and baggage tags — and the ICAO code NLWW, used in flight plans and by air traffic control. It serves Wallis Island, Wallis and Futuna.
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.