Noi Bai International Airport

Noi Bai International Airport carries the IATA code HAN — the three letters printed on boarding passes and baggage tags — and the ICAO code VVNB, used in flight plans and by air traffic control. It serves Hanoi (Soc Son), Vietnam.

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.