Search crews who retrieved four more bodies from the crashed Air France jet, have spotted other bodies and found a large amount of debris from the plane that plunged into the Atlantic ocean.

Six bodies have now been recovered from the plane, following the discovery of two unidentified males yesterday, five days after the Airbus A330 crashed on its way from Rio de Janeiro to Paris killing all 228 people on board.

Investigators are considering the possibility that the speed sensors on Flight 447 may have iced up, and Air France said it was accelerating the replacement of speed sensors on all its Airbus long-haul planes.

Brazil's navy said today it had retrieved three more bodies and France said a helicopter operating from one of its naval frigates had recovered another body from the world's worst air disaster since 2001.

‘Hundreds of items are being found and being stored until we know where they should go,’ Brazilian Air Force spokesman Henry Munhoz said in Recife, where the bodies and debris will eventually be brought.

Several other corpses spotted by Brazilian Air Force planes are expected to be picked up later, search officials said.

12 Brazilian planes, one equipped with radar equipment that can detect material in the water, two French planes, one French ship and five Brazilian navy ships are searching the area about 1,100km northeast of Brazil's coast.

France has also sent a nuclear-powered submarine that should arrive on Wednesday to search for the black box flight data recorders that will be crucial to understanding why the plane fell from the sky on Monday.

Air France said it had begun the switchover of speed sensors five weeks before the crash, but only after disagreeing with Airbus over the planemaker's proposal to carry out tests before replacing them.

An Airbus spokesman declined to comment and said it could only discuss the investigation with French air authorities.