Back when I was a lad there was an Australian magazine which compiled an industry directory each year.
It was available in newsagencies when I was in High School (1980s) and by subscription in the 1990s, but I haven't seen it (or its parent publication) for many years.
"Aircraft & Aerospace" Annual I think it was, it used to list the operators, their Chief Pilots, aircraft fleet etc.
*sigh* things were better in them days.