The article referfenced in Lucky Lukes post appears to be trying re write history.
The MA60 wasn't procured because Air Chathams pulled out. Air Chathams pulled out because the MA60 had been introduced and was going to make the Air Chathams operation unviable.
The Tongan government was going into competition with Air Chathams using what was essentially a donated aircraft. Another example of a we can do it better without actually realising how good the deal from Air Chathams was to start with.