CHC and GVA are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. CHC to GVA refers to a flight route from Christchurch Airport to Geneva Geneve-Cointrin Airport. While you’re still figuring out your travel plans, it’s not a bad idea to learn the names and codes of other airports around these areas: Belp Airport (BRN), Lugano Airport (LUG).