What is "aviogenex"

Aviogenex (literary Serbian: Aviogeneks / Авиогенекс) was a Serbian charter airline based at Belgrade Nikola Tesla Airport. It operated regular and ad hoc charter flights as well as wet-lease services. Prior to the break-up of Yugoslavia, Aviogenex was the busiest charter airline in the country, handling over half a million passengers per year in the late 1980s.