These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Osaka Kansai Intl Airport to Coimbatore Peelamedu Airport flight would often be abbreviated as a KIX to CJB flight. Fukuoka Airport (FUK), Tokyo Narita Airport (NRT), Sapporo Chitose Airport (CTS), Tokyo Haneda Airport (HND), Okinawa Naha Airport (OKA) are other airports near this flight route and their unique identifiers/IATA codes. Find deals