Heavy seas stopped divers reaching the possible wreck of an AirAsia Indonesia jet off Borneo yesterday and an aviation official said it could be a week before the black box flight recorders are found.

Nine bodies have so far been recovered from the Airbus A320-200, which crashed on Sunday en route to Singapore from the Indonesian city of Surabaya with 162 people on board.

The bodies were brought in numbered coffins to Surabaya where relatives have gathered for identification.

AirAsia Indonesia’s CEO Sunu Widyatmoko was seen weeping when authorities handed over the body of the first victim, Hayati Luthfiah Hamid, to family members at a Surabaya hospital.

Hamid, 49, was buried yesterday before sundown in the suburb of Desa Sawotratap, a few kilometres from the city, at an Islamic ceremony attended by relatives and neighbours. Three members of her family were also on board the plane.

Searches yesterday spanned an area of 13,500 square kilometres involving 19 ships, four helicopters and five planes, said Fransiskus Bambang Soelistyo, head of Indonesia’s Search and Rescue Agency.

So far, as well as bodies, a suitcase, an emergency slide and a life jacket have been recovered

A search and rescue pilot has spotted a large shadow in the sea, which rescuers believe may be the wreckage, but they have made clear the sighting is not yet confirmed.

“Until now, there hasn’t been a confirmed finding or sonar image of the plane body under water,” Soelistyo said.

Forty-seven divers are on standby to investigate.

“I am hoping that the latest information is correct and aircraft has been found,” airline boss Tony Fernandes tweeted yesterday.

Toos Sanitiyoso, an air safety investigator with the National Committee for Transportation Safety, said it could take a week to find the black box.

Committee head Tatang Kurniadi said the focus of the search, once the waters had calmed as expected in five days, was around the shadow.

“We are backtracking from where the wreckage was found to where the plane had its last reading and that is the focus of our search,” Kurniadi said. “The depth around here is 50 metres. No specialist equipment is required. Divers can go get it.”

Investigators are working on a theory that the plane stalled as it climbed steeply to avoid a storm about 40 minutes into the flight.

“What is most difficult is finding the location where the plane fell – checking whether the aircraft is really there,” frogman commander Lieutenant Edi Tirkayasa told Reuters. “With weather like this, who knows? We are still hopeful and optimistic that they’ll find it. They must.”

So far, as well as the bodies, debris including a suitcase, an emergency slide and a life jacket have been recovered from waters near the suspected crash site.No survivors have been found.