Re: Tail fin
It's a PR stunt and really obvious why when you visit the factory. Def. not CGI unless they have some way of CGIing four planes in an assembly line when you are looking at them 'in real life'. See my reply above for more details.
There are often logos of other 'partner' companies on the planes, as well as country flags. I'm not sure if these are actually painted on, they could be vinyl.