Callsign CSN is China Southern
WHAT AIRLINE IS CSN?
CSN is the ICAO three-letter callsign prefix for China Southern. When a radio scanner, flight tracker or radar scope shows a flight like CSN123 or CSN45XY overhead, that's a China Southern aircraft talking to air traffic control.
Spot one yourself: open the live scope, enter your postcode, and tap any blip whose callsign starts with CSN for its type, registration, route and photo.