Jaynes, a Micronesian journalist, was aboard a plane set to land on Weno, the tiny Pacific island that is part of the Federated States of Micronesia. It said it was in touch with embassies, passenger representatives, stakeholders and families of the crew.
The airline did not immediately offer any other details about the passenger, such as his age or nationality.
The cause of the crash remains unclear. "And I thought, well, this is not the way it's supposed to happen". "One would think they might be afraid of approaching the plane that's just crashed".
Within minutes, local fishermen were on the scene with a flotilla of small motor boats to rescue people.
However the company is now stating that it was unable to account for one male passenger, following the incident on Friday which saw the plane take a splash landing in the Pacific lagoon.
Jaynes said he had to wade through waist-deep water to get to the emergency exit.
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It's the national airline of Papua New Guinea, a nation that makes up the western half of the giant island of New Guinea known for remote jungle-clad mountains and tribes that rarely make contact with the outside world.
Footage has emerged of U.S. navy sailors embarking on a rescue mission in the aftermath of the plane crash - using an inflatable boat to shuttle people ashore before the plane sank in about 100ft (30m) of water. The operator blamed the incident on poor weather and that heavy rains had reduced visibility. Its capital is Palikir and it trades with the US dollar.
He said he has yet to see a passenger manifest, but typical passengers would include businesspeople from Micronesia, Papua New Guinea and Australia, as well as some tourists.
The 13-year-old aircraft's wing was reportedly damaged in May, when another aircraft that was taxiing at Jacksons International Airport in Port Moresby hit it while it was parked and unoccupied.
'I'm alive. That's an extremely good thing, ' said Jaynes.