• Authorities have been unable to explain why the plane crashed just four minutes after take-off.
• Some analysts have opined that bad weather, pilot error, poor maintenance and mechanical failure were among possible factors.
• At least five other victims have since been identified, as forensic examiners sort through mangled human remains.

Sobbing friends and relatives filed into a Jakarta cemetery Thursday to bury the remains of a flight attendant from the crashed Indonesian passenger jet, as divers restarted their hunt for its second black box.

Okky Bisma, 29, was the first confirmed victim of Saturday's disaster after fingerprints from his retrieved hand were matched to those on a government identity database.

There were 62 crew and passengers, including 10 children, on the Sriwijaya Air Boeing 737-500 when it plunged about 10 000 feet (3 000 metres) in less than a minute before slamming into the Java Sea just after take-off from Jakarta.

At least five other victims have since been identified, as forensic examiners sort through mangled human remains retrieved from the wreckage-littered seabed in the hope of matching DNA with relatives.

READ HERE | Sriwijaya Air crash places Indonesia's aviation safety under fresh spotlight

At the cemetery, Bisma's wife Aldha Refa clutched a portrait of her husband and sprinkled flower petals on a mound of dirt where his coffin was buried.

"Rest in peace up there darling and wait for me... in heaven," Refa, also a flight attendant, wrote in a tribute posted on social media this week.

"Thank you for being the perfect husband when you were on earth."

Funeral traditions in Indonesia, the world's biggest Muslim-majority nation, call for a quick burial of the dead.

But the identification process could take weeks or more, prolonging the agony for some distraught families.

READ | Grim procession: Indonesia crash victim families give blood for DNA matching

Bisma's family gave up hope of recovering more remains and decided instead to bury what divers had retrieved, said his father Supeno Hendy Kiswanto.

"Today we're still mourning, but we surrender to Allah for what has happened," Kiswanto told the ceremony.

"Death is in the hands of God... Let's pray Allah grants him a place in heaven."

Fresh hunt

Nearly 270 divers were on hand Thursday as authorities restarted the underwater hunt, which was called off a day earlier due to bad weather and rough seas.

"The main focus (today) will be the diving," Rasman MS, the search-and-rescue agency's operations director, said earlier Thursday.

"We're not just looking for one thing - victims, the cockpit voice recorder and debris are all priorities."

Investigators said they had extracted and cleaned a memory module from a retrieved flight data recorder and hope to be able to read critical details on the device soon, with the focus now on finding the plane's cockpit voice recorder.

Black box data includes the speed, altitude and direction of the plane as well as flight crew conversations, and helps explain nearly 90 percent of all crashes, according to aviation experts.

So far authorities have been unable to explain why the 26-year-old plane crashed just four minutes after take-off, bound for Pontianak city on Borneo island, a 90-minute flight away.

ALSO READ | Indonesia divers search for crashed plane's second black box

It had experienced pilots at the controls, and preliminary evidence showed that the crew did not declare an emergency or report technical problems as it sharply deviated from its planned course just before the crash, authorities said.

Bad weather, pilot error, poor maintenance and mechanical failure were among possible factors, aviation analysts said.

As the global pandemic hammered demand for air travel, the jet - previously flown by US-based Continental Airlines and United Airlines - had been parked in a hangar for about nine months before it was put back into service in December after being declared airworthy, according to the transport ministry.

Since then, it had flown more than 130 times before the accident, flight tracking data showed.

The crash probe was likely to take months, but a preliminary report was expected in 30 days.

Source: News24