Xining Caojiabao International Airport

Xining Caojiabao International Airport carries the IATA code XNN — the three letters printed on boarding passes and baggage tags — and the ICAO code ZLXN, used in flight plans and by air traffic control. It serves Haidong (Huzhu Tu Autonomous County), China.

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.