Originally Posted by
philbky
Preon, as late as 1987 the mechanical departure boards at Washington Dulles had BOAC light blue tags which could be seen when the boards flipped over and sometimes were used for BA flights.
The vestiges of the 1974 BEA/BOAC merger to form BA were visible within the company for many years after that, if you knew where to look.
In fact some are arguably still present today, for example if you board a BA flight numbered below BA300, you're flying what would have been a BOAC route, and if your flight number is odd then you're outbound from LHR. Conversely, you're on a route in BEA's empire if it's BA300 and upwards, and outbounds are even numbered.