PERTH, Australia — Search planes scoured a remote patch of the Indian Ocean but came back empty-handed Friday after a 10-hour mission looking for any sign of the missing Malaysia Airlines jet, another disappointing day in one of the world's biggest aviation mysteries.
Australian officials pledged to continue the search for two large objects spotted by a satellite earlier this week, which had raised hopes that the two-week hunt for the Boeing 777 that disappeared March 8 with 239 people on board was nearing a breakthrough.
But Australia's acting prime minister, Warren Truss, tamped down expectations.
"Something that was floating on the sea that long ago may no longer be floating — it may have slipped to the bottom," he said. "It's also certain that any debris or other material would have moved a significant distance over that time, potentially hundreds of kilometers."
In Kuala Lumpur, where the plane took off for Beijing, the country's defense minister thanked more than two dozen countries involved in the search that is stretching from Kazakhstan in Central Asia to the southern Indian Ocean, and said the focus remains on finding the airplane.