Indonesia's search and rescue agency has said two metal objects were detected underwater by a US search team looking for wreckage from AirAsia Flight QZ8501.
However, experts have not yet been able to confirm whether they are debris from the crashed flight.
"USS Fort Worth detected sonar (of) two metal objects, but we still need to confirm if this is part of the plane," said Fransiskus Bambang Soelistyo
The chief of Indonesia's National Search and Rescue Agency was speaking as the search operation wound down for the day.
The Singapore-bound Airbus A320-200 plunged into the Java Sea on 28 December.
It had just taken off from Indonesia's second biggest city, Surabaya, with 162 passengers on board.
Indonesian officials believe they may have located the tail and parts of the fuselage of the plane at the bottom of the sea.
However, strong currents, high winds and big waves have hindered attempts to send divers to investigate.
"Today the weather is good enough but the current underwater is still strong at two to four knots and so we can't use ROV (Remotely Operated Underwater Vehicle) or search with divers," said Mr Soelistyo.
A multi-country search operation is taking place off the coast of Borneo looking for the more bodies and the flight data recorders that carry crucial information.
The recorders are housed in the tail section of the plane, making retrieval of that part of the aircraft crucial.
The bodies of 39 crew and passengers have been retrieved.
Sixteen of the victims have been identified and forensic experts are working around the clock to identify the others.
Indonesia's meteorological agency has said seasonal tropical storms probably contributed to the crash.
