Air Niugini says it's reviewing safety measures for all airports it operates in after the fatal crash in the Federated States of Micronesia last month.
On Friday the carrier released its preliminary report into the crash at the Chuuk International Airport, in which one person died and six were injured.
The report said last week Air Niugini tightened its safety measures for landing at the airport and nearby Pohnpei airport.
It said other airports in Air Niugini's network are being reviewed and may also be re-categorised.
The report's findings have been reserved for the release of the final report.