Great question - YOW to KOA just means Ottawa Airport to Kona Intl Airport. Now you’ll know what these unique codes when you look for flights! Hilo Intl Airport (ITO), Waimea (Kamuela) Waimea Kohala Airport (MUE), Hawi Upolu Point Airport (UPP), Waikoloa Village Airport (WKL) are other airports near this flight route and their unique identifiers/IATA codes.