It is several years since I was a Pax on Onur (MD88)- LH seat outbound was ex Turkish Air Force, honed on Phantoms, good English, lots of military hours, not much transport jet time. RH seat was quite different - Eastern European (Ukranian or Belarus, can't remember) also ex military, and NO English. Was chatting on the company freq. to someone else, presumably in Russian.
Return leg two fairly newbies, 27 y.o. captain - both Turkish. Don't know if this reflects their current staffing.