Just to annoy you lot.
When we flew around the northern isles we used "Speedbird".
At some time there used to be a callsign "Bealine".
For a while "Albion" was used by domestics.
We always used "Speedbird" in BOAC.
As I recall, may have been wound up, when BEA and BOAC amalgamated a comittee was formed to come up with a new callsign.
It was decided that Khartoum, and other places, could probably not cope with a new callsign for what had always been "Speedbird" and it was best left that way.