The Australian-led mission said it was sending five aircraft back to a storm-lashed area some 2,500 km (1,500 miles) southwest of Perth. The search began on Thursday after analysis of satellite images identified two large objects floating in the ocean there that may have come from the Boeing 777 which went missing 13 days ago with 239 people aboard.
Investigators have said the sighting in one of the most isolated parts of the globe was a credible lead but nothing beyond that.
"It's about the most inaccessible spot that you can imagine on the face of the earth, but if there is anything down there, we will find it," Australian Prime Minister Tony Abbott told reporters in Papua New Guineau, where he is on a visit.
"We owe it to the families of those people (on board) to do no less."