Just to add a little to the Masling side of things, the main aircraft was the Queenair (4) a DC3 (MWQ) Twin Bonanza (SKY) Twin Otter 200 and then commencing in June, 1978 E110 (P2s)(4).
MWQ was originally used by the US marines in PNG then went to WA as (MMA) and later returned to PNG as P2-ANS and eventually to Masling as MWQ and had in excess of 66,000 hours when on sold to Air North. It was a great aircraft and gave fantastic service with no engine probs whatsoever after one chuffy cylinder was changed. It even serviced Lord Howe Island by delivering freight and the furniture and belongings of the met observers on changeover.
All the aircraft operated were great for their time.
The first E110 arrived in Aust on the 30th June, 1978 after a ferry across the South Pacific via Easter Island.