I use add on linker and categorise liveries for Europe and the USA where I normally fly
So at LEIB you have only European airlines and at KLAX it’s only US/Canada airlines
I only do this with the A320 liveries
Advantage: you don’t get easyJet at KLAX
And you don’t get JetBlue at LEIB
Disadvantage:You have to add continental flights to both folders for true realism but this would mean adding another file with liveries like BA, Lufthansa, Air France but it all depends on your departure or arrival airports
It can get a bit confusing 