Port Moresby to Tari - options?

I'm intersted in flying from Port Moreseby to Tari. However the internet site for Air Niugini won't allow me to make the reservation (although the flight shows on their website, and I get a price quote). Very frustrating. Does anyone know another airline that flies this route (one way), and contact information? Thank you! Swanlaw

I haven't got a clue who else flies that route these days, but as no one else could tell you that either, I'd just like to note that Air Niugini flights always seemed to be possible to book once in PNG.
So perhaps you could just wait till you get there - or try and book through a travel agent in your home country if you really think you have to.