Callsign SXS is SunExpress
WHAT AIRLINE IS SXS?
SXS is the ICAO three-letter callsign prefix for SunExpress. When a radio scanner, flight tracker or radar scope shows a flight like SXS123 or SXS45XY overhead, that's a SunExpress aircraft talking to air traffic control.
Spot one yourself: open the live scope, enter your postcode, and tap any blip whose callsign starts with SXS for its type, registration, route and photo.