Now i'm making my new airline named "Aeroflot" that's based on Moscow. And i'm going to do the only russian planes challenge. Going to update my new airline soon
Interesting idea, although I have tried it and it does not work. But remember, even if you do, at one point the Aeroflot fleet included 737-400s and still include various 777s, A330s and A350s, as well as newest 737s and A320s. Almost no Aeroflot airplanes anymore are Russian/Soviet.