PER and CUN 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. PER to CUN refers to a flight route from Perth Airport to Cancun 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: Tulum Intl Airport (TQO), Cozumel Airport (CZM).