The sightings would need confirmation by ship, which is not expected until tomorrow, the Australian Maritime Safety Authority (AMSA) said.
Earlier it was announced the search would now focus on an area 700 miles north-east of the previous zone.
Malaysia Airlines flight MH370 disappeared on March 8 with 239 people on board.
The identity of the objects – spotted by a Royal New Zealand Air Force Orion – were “to be established”, AMSA said.
The crew said they had spotted 11 unidentified objects.
The images hold out the prospect of up-to-date information, as opposed to satellite images which are invariably days out of date by the time they are seen by investigators.
Earlier, the Australian and Malaysian governments said the focus on the new search area was based on further analysis of radar data that showed the plane had been travelling faster, thus burning more fuel.
Search efforts had until Friday morning focused on an area some 1,550 miles to the south-west of the Australian city of Perth.
Malaysian officials have concluded that, based on satellite data, the missing plane flew into the sea somewhere in the southern Indian Ocean. So far no trace of it has been found.
Using satellite images, several nations have identified objects floating in the sea in that search area, but these have not been located and there is no evidence that they are related to the plane.
Acting Malaysian Transport Minister Hishammuddin Hussein said that the fact that the search area had moved did not discount the earlier satellite images of possible debris further south.
“Because of ocean drift, this new search area could still be consistent with the potential objects identified by various satellite images over the past week,” Hishammuddin Hussein said.
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