People are evacuated from an Air Niugini plane crashed in the waters in Weno, Chuuk, Micronesia, September 28, 2018 in this picture obtained from social media.
The airline did not immediately offer any other details about the passenger, such as his age or nationality.
What caused the crash and the exact sequence of events remains unclear. "I thought "this is not the way it's supposed to happen". Some witnesses thought the plane overshot the runway.
Survivors of the incident have praised the swift rescue efforts of locals on small boats, as well as some United States Navy divers who were close to the scene.
The men compared headcounts of passengers and crew originally on the plane, and the number who boarded a host of small boats that also raced to the rescue. The airline said the plane landed short of the runway.
Jaynes said he and others managed to wade through waist-deep water to the emergency exits on the sinking plane and added that the flight attendants were panicking and yelling, and that he suffered a minor head injury.
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The group was on its way to the Philippines for a vacation when the Boeing 737-800 aircraft crashed into the lagoon as it attempted to land at an airport in Chuuk Island on Friday, the DFA said in a statement. The operator blamed the incident on poor weather and that heavy rains had reduced visibility.
Air Niugini is Papua New Guinea's national carrier.
Chuuk Lagoon is a popular diving destination and the site of sunken Japanese ships that were bombed by the USA military during World War II.
According to data from the Aviation Safety Network, 111 people have died in crashes of Papua New Guinea-registered airlines in the past two decades, though none involved Air Niugini.
Jaynes, meanwhile, reflecting on his experience, said, "I'm alive, and that's an extremely good thing".
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.