0X
Copenhagen Express
Denmark
IATA
0X
Zero X-ray
ICAO
CX0
Radio Callsign
Copex
Example: "Copex One Two Three" for 0X123
About the "Copex" Callsign
When Copenhagen Express pilots communicate with air traffic control, they identify themselves using the radio callsign "Copex" followed by the flight number spoken in aviation pronunciation. For example, flight 456 would be "Copex Four Five Six." Radio callsigns are assigned by ICAO and are distinct from the airline's marketing name.