The U.S. Embassy in Micronesia said it was working to confirm the identities and the health and safety of any American passengers onboard the flight.
Papua New Guinea's national carrier says a search continues in Micronesia for a passenger missing after last Friday's crash landing of an Air Niugini flight.
A special Air Niugini flight departed Port Moresby early this morning as planned, and a support team is now on the ground in Chuuk assessing the condition and immediate needs of the passengers and crew.
Minutes after the plane crashed into the Pacific lagoon, local people and mini boats quickly showed up to rescue the passengers.
While the airline did not provide details of the cause of the crash, it said it had received information that "the weather was very poor with heavy rain and reduced visibility at the time of incident".
Air Niugini is yet to release the manifest but it is understood that there was at least one Fijian, nine Filipinos and some Indonesians, and Micronesians on board.
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A spokesman for Papua New Guinea's Accident Investigation Commission said investigators would fly to the scene as soon as possible to piece together what happened.
Long after the locals with boats had gone to the rescue of crew and passengers then U.S. Navy Sailors joined to assist local authorities. The airline identified the flight as PX 073 with the registration number P2-PXE.
The fleet includes Boeing 767 and 737 jets for global routes, according to the airline, as well as Fokker F-100 aircraft, Q400 and Dash 8 aircraft for challenging local terrain. Its capital is Palikir and it trades with the USA dollar. The country is located north of Australia and east of the Philippines. Pilots Chesley Sullenberger and Jeffrey Skiles safely landed their powerless plane on the Hudson River and passengers and crew walked on the wings to be rescued.
Bill Jaynes, managing editor of a Micronesia-based newspaper, was on the plane when it hit the water.
Micronesia is a constitutional government in free association with the United States; achieved independence in 1986. "That's an extremely good thing".