This is just an IATA (International Air Transport Association) code. IATA codes are used in aviation to identify and differentiate airports. That’s why a Busan Gimhae Airport flight would often be abbreviated as a PUS flight.
For a flight to Busan, you will be flying into Gimhae. Busan Gimhae (PUS) is just 11.6 km from the centre of the city.
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