BA currently operates a combination of “just-in-time”, [..] management philosophies. Unfortunately the rest of the world got rid of these flawed US techniques of 10 years ago.
No they have not, JIT at least is still alive well and delivering the goods in most successful manufacturing companies and some others. BUT it’s not appropriate when switching on a major facility and arguably not in a time & service critical service industry.
At a time like this you plan for the worst case, over train (if that’s possible) and flood the place with staff, trainers, management, engineers, IT people (who can at least help people use the systems) and anyone else who might be able to help. Oh yes, and you work out your media plan in case of disaster in advance.