IO
Indonesian Airlines
Indonesia
IATA
IO
India Oscar
ICAO
IAA
Radio Callsign
INDO LINES
Example: "INDO LINES One Two Three" for IO123
About the "INDO LINES" Callsign
When Indonesian Airlines pilots communicate with air traffic control, they identify themselves using the radio callsign "INDO LINES" followed by the flight number spoken in aviation pronunciation. For example, flight 456 would be "INDO LINES Four Five Six." Radio callsigns are assigned by ICAO and are distinct from the airline's marketing name.