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 Changsha Huanghua Intl Airport flight would often be abbreviated as a CSX flight.
Changsha Huanghua Intl (CSX), located 24.4 km from the city centre, is the airport you fly into when you book flights to Changsha.
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