Callsign SWR is Swiss
WHAT AIRLINE IS SWR?
SWR is the ICAO three-letter callsign prefix for Swiss. When a radio scanner, flight tracker or radar scope shows a flight like SWR123 or SWR45XY overhead, that's a Swiss aircraft talking to air traffic control.
Spot one yourself: open the live scope, enter your postcode, and tap any blip whose callsign starts with SWR for its type, registration, route and photo.