These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Queenstown Intl Airport to Victoria Intl Airport flight would often be abbreviated as a ZQN to YYJ flight. 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: Comox Airport (YQQ), Nanaimo Arpt Airport (YCD), Victoria Inner Harbour Seaplane Base Airport (YWH), Campbell River Airport (YBL), Tofino Long Beach Airport (YAZ).