We have to remember these days British Airways are only a subsidiary of an airline group. That Spanish company IAG has at least five EU AOCs, Iberia, Vueling, Aer Lingus, Level & Openskies and two UK AOCs BA & Cityflier. I believe that’s why they haven’t needed to change. Now the question is do the companies need to fly G-reg aircraft from the UK or can they wetlease an EU reg in if required? What about TUI (they have EU AOC as are German company but still have Thomson’s UK AOC) can they just sub in a German or Skandi plane when needed? Thomas Cook as a German company (Condor) they have both AOCs but move their fleet around. I’m not sure Flybe still do charters in Finland or Loganair in the Rep of Ireland but I presume they won’t register for an EU AOC. Though do BMI still do charter work for Airbus, will Loganair/BMI need to obtain an EU AOC or will it make the routes not worth it. Anyway we can’t even deal with Eire/Northern Ireland Border so I don’t think this will be solved soon.