Papua New Guinea's Civil Aviation Authority says it needs to spend about 500 million US dollars on upgrades to airports or the aviation industry will be adversely affected.
The Authority's boss, Joseph Kintau, has listed nine airports across PNG that urgently need upgrading.
Mr Kintau says most of PNG's airports are ill-equipped to handle Fokker F100s jets after Fokker F28 planes were phased out in 2007.
He has placed advertisements for upgrade contract work in both of PNG's national newspapers, saying government funding had been allocated but not yet delivered.
