Two pilots, a loadmaster and a flight attendant were escorted to Mt Hagen by security personnel.
Kaumu said this was their priority as a company concerned for the safety of its staff.
Meantime, a source inside Air Niugini said commercial flights into the highlands region are to two ports – Goroka and Mt Hagen; the rest have been suspended, and that includes Mendi, Tari airport in Hela and Wapenamanda Airport in Enga Province.
