Not sure about MCM and MCP but I do know that MCT ended up in Perth with Maroomba, last time I was there I saw it awaiting an Aussie paint job.
MCM and MCP were pretty old if I remember rightly but were sold to a leasing company and then leased back as airlines of PNG raised cash before it moved to ATRs
PNG Air seem to be struggling now as are all the airlines around the world. Looks as though the inevitable will happen and they will be absorbed into Air Niugini. Really this is the only way that a sustainable air service can be sustained in a bankrupt, (in many more than one ways than one), country.
Good luck Wantoks.
and where are Bruce and Andy?