Controlador, you must be joking. English is the official aviation language all around the world. I've never had any difficulties with understanding the controllers (or controllers me) when flying for example in Scandinavia or German speaking countries, the Netherlands etc. Of course the accents vary but I've always got the job done - and sometimes even with some nice extra
It's always fun to chat with a controller if the traffic level is low and the frequency is quiet.
Maybe they just teach English language better in some countries. Who knows. Anyway, I'm not a controller and I know nothing about their requirements but I would like to know what kind of an English test do the Spanish/Italian/French controllers have? And why are the language problems there where they are?
jtor