PERTH, Australia (AP) — Australian officials say it's not time to quit yet, even though the latest lead in the hunt for a missing Malaysian airliner hasn't panned out yet and frustration is growing.

Planes spending a third day hunting for two large objects spotted by satellite in the southern Indian Ocean are being joined today by ships which are in the area or about to arrive. Ships plan to investigate another reported Chinese satellite contact. The weather in the search area today is improved.

Two military planes from China have arrived in Australia to help with the search for flight 370, which disappeared with 239 people on board.

Malaysian authorities have not ruled out any possible explanation for what happened to the jet but have said the evidence so far suggests it was deliberately turned back across Malaysia to the Strait of Malacca, with its communications systems disabled.