Silly me, I always understood PNG international designated airports were declared on the whim of the minister at some press conference on EMTV or other.
If the following quote is infact correct then I submit that the PNG authorities have been operating contrary to international law and convention. I'm sure that would come as no surprise to many of us.
ICAO approval or not has nothing to do with whether a company can fly to a place internationally, the regulatory authorities in PNG decide what are designated International ports.
tipsy