WE all understand - it's you outsiders who don't
That's not even said tongue-in-cheek is it? "Outsiders" for Gods sake? This isn't some farmers market.
Like EKKL I often don't understand either. There are thousands of codes - it'd make life a lot easier if the places were spelt out. Perhaps an encyclopaedic knowledge of airport abbreviations should be de rigeur for professional pilots eh?