BA Shuttle call sign - why bother?
BA still uses a call sign of Shuttle for domestic flights (as opposed to Speedbird for the rest of the schedule), a leftover call sign from their 80s turn-up-and-go operation 'super shuttle'
It is not unusual for airlines to have different call signs for different legal entities, though this puzzles me too. For example EZY Switzerland is prefixed EZS and its call sign is Topswiss.
But when operated by the same aircraft and same crew why go to the bother of changing call signs. Pilot doing NCL-LHR announces himself as Shuttle xx and an hour later doing LHR-AMS calls himself Speedbird xxx.
Why do they bother and why not rationalising this?