What level of airline employee chooses registrations?
Such a small matter, but someone in BA thought that G-ZZZ_ and G-VII_ were good for their 777s, and G-EU__ for small Airbuses but G-XL__ for XL Airbuses. And to put G-RAES on a 777 for the RAeS I'd have thought quite a high-level decision.
Someone in Virgin must have decided that G-VBUG was good and not prone to mockery.
So I wonder how senior a person gets to decide these tiny questions? A clerk in the purchasing department, or the director of marketing?