Which airline's radio callsign is “Speedbird,” a name inherited from Imperial Airways?

British Airways uses the radio callsign “Speedbird,” inherited from Imperial Airways.

Imperial Airways adopted the Speedbird emblem in the 1930s, and the name became associated with the airline's aircraft and radio operations. British Airways inherited the callsign when it was created in 1974 through the merger of British Overseas Airways Corporation and British European Airways.

In aviation communications, a callsign is the spoken identifier used by pilots and air traffic controllers. It is different from an airline's IATA designator, ICAO designator, or flight number. British Airways commonly uses the ICAO designator “BAW” in flight operations, while “Speedbird” is the spoken telephony designator.

The Speedbird name remains a visible link between modern British Airways and Britain's earlier state-owned airline history. The airline's IATA code is BA, and its main hub is London Heathrow Airport.