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 Surabaya Juanda Airport flight would often be abbreviated as a SUB flight.
Most people fly into Surabaya Juanda (SUB) if they book a flight to Surabaya. Juanda is conveniently located just 15.0 km from Surabaya’s city centre.
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