REPUBLIKA.CO.ID, PANGKALAN BUN/SURABAYA -- Ships and aircraft criss-crossed the seas off Borneo on Friday hunting for the wreck of an Indonesia AirAsia passenger jet, but bad weather was again hindering the search for the plane and the black box flight recorders that should reveal why it crashed.

Officials said more than 20 bodies have now been recovered, along with pieces of the broken-up plane, in the Indonesian-led search for Flight QZ8501 that is concentrated on 1,575 square nautical miles of the northern Java Sea.

Strong winds and heavy seas have stopped divers from looking for the fuselage of the Airbus A320-200, which plunged into the water on Sunday while en route from Indonesia's second-biggest city Surabaya to Singapore with 162 people on board.

"The waves could reach five meters this afternoon. Higher than yesterday," said air force Puma helicopter pilot Flight Captain Tatag Onne, who has been flying missions to recover bodies and debris from the sea.

"We look for breaks in the clouds where conditions improve so that we can approach. Yesterday, when we went to collect a body from the sea we couldn't because the body was being rolled by waves. Sometimes we could see it, sometimes we couldn't."

The multinational search operation based in Pangkalan Bun, the town in southern Borneo closest to the search area, was bolstered on Friday by experts from France's BEA accident investigation agency, which attends all Airbus crashes.

Officials said the French team's hydrophones - sophisticated underwater acoustic detection devices - and towed sonar equipment brought by other international experts could not be used on Friday because of high waves.

"The sea state has to be calm," General Sunarbowo Sandi of Indonesia's search and rescue agency said. "We cannot operate it in poor weather."

But naval vessels from Indonesia, the United States and Singapore with in-built anti-submarine capabilities were using sonar to sweep the sea floor, he added.

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