Originally Posted by
MARK9263
The 'B-line' call-sign was replaced in late-October 1978, along with 'Shuttle' when all British Airways flights were standardised by the 'Speedbird' call-sign.
This might have been when the flight numbers were standardised as well on 1-299 for long haul and 300-up for short haul, as mentioned above. I seem to recall on the Los Angeles flight it was BA598/599 in early 1978, and BA 282/283 a few months later.