gee,
geeup you would know this how?? define a private op and than tell me it is not privately operated and is operating illegally. If it was an illegal operation than why has the plane not been confiscated or refused entry? maybe because it has appoval and cleares customs upon every entry and does so on a regular basis.
Upon a little research (not hard these days with the internet) one would find that this aeroplane is operated in and out of png by a mining consulting agency ( gee an aeroplane operated by a mining consulting agency flying to a mine, sounds dodgy to me
)