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MH370: What do we know? What will we ever know?

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In this , Tuesday, April 1, 2014 photo made available Thursday, April 3, 2014, a crewman on a Royal New Zealand Air Force P-3 Orion Rescue Flight 795 searches for debris from the missing Malaysia Airlines Flight MH370, in southern Indian Ocean, 1,500 kilometers northwest of Perth, Australia. The focus of the search has changed repeatedly in the nearly four weeks since the air traffic controllers lost contact with the Boeing 777 between Malaysia and Vietnam over the South China Sea. It began in the South China Sea, then shifted toward the Malacca Strait to the west, where Malaysian officials eventually confirmed that military radar had detected the plane. (AP Photo/AAP Image, Kim Christian, POOL)

In this , Tuesday, April 1, 2014 photo made available Thursday, April 3, 2014, a crewman on a Royal New Zealand Air Force P-3 Orion Rescue Flight 795 searches for debris from the missing Malaysia Airlines Flight MH370, in southern Indian Ocean, 1,500 kilometers northwest of Perth, Australia. The focus of the search has changed repeatedly in the nearly four weeks since the air traffic controllers lost contact with the Boeing 777 between Malaysia and Vietnam over the South China Sea. It began in the South China Sea, then shifted toward the Malacca Strait to the west, where Malaysian officials eventually confirmed that military radar had detected the plane. (AP Photo/AAP Image, Kim Christian, POOL)

Australian Prime Minister Tony Abbott, right, and Malaysian Prime Minister Najib Razak talk during their meeting at the Commonwealth Parliament Offices in Perth, Australia, Thursday, April 3, 2014. Abbott, whose country is coordinating the current search effort, spoke of “very credible leads†and “increasing hope†a day before Najib’s announcement. But on Thursday he said the search has become “the most difficult in human history.†(AP Photo/Richard Wainwright, Pool)

Malaysian Prime Minister Najib Razak speaks at a breakfast with crew members from different countries involved in the search for wreckage and debris of the missing Malaysia Airlines MH370 in Perth, Australia, Thursday, April 3, 2014. In a hastily called speech, Malaysian Prime Minister Najib Razak announced that an unprecedented analysis of satellite signals concluded that Malaysia Airlines Flight 370 “ended†deep in the Indian Ocean, far from any possible refuge for the 239 souls aboard. (AP Photo/Rob Griffith, Pool)

FILE – In this Tuesday, April 1, 2014 photo, retired Australian Air Chief Marshall Angus Houston speaks about the missing Malaysia Airlines flight MH370 at a press conference in Perth. Australian officials have expressed increasing pessimism in recent days. Houston, who heads the joint agency coordinating the multinational search effort out of Australia, said investigators are using computer modeling to determine the plane’s final location, but two key variables needed to calculate that more precisely are unknown: the aircraft’s altitude and speed. (AP Photo/Greg Wood, Pool)

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BANGKOK (AP) — At the time — the evening of March 24 — it seemed like the breakthrough the world was waiting for.

In a hastily called speech, Malaysian Prime Minister Najib Razak announced that an unprecedented analysis of satellite signals concluded that Malaysia Airlines Flight 370 “ended” deep in the Indian Ocean, far from any possible refuge for the 239 souls aboard.

Finally, there was a solid explanation for what happened to the aircraft. A much more focused search could begin, and so perhaps could the grieving process for families from 14 countries. Najib’s announcement quieted wild speculation about desert islands and terrorists and covert operations.

But four weeks after the plane disappeared, the apparent pivot in the search is proving to be not much of a pivot at all.

Not a single piece of wreckage from the lost plane has been found, not even after a new analysis led investigators to change the focus of their search yet again. The latest search area is based on extremely limited satellite data combined with radar data taken some five hours before the plane is believed to have gone down. It is, as one search official said, “a very inexact science.”

Australian Prime Minister Tony Abbott, whose country is coordinating the current search effort, spoke of “very credible leads” and “increasing hope” a day before Najib’s announcement. But on Thursday he said the search has become “the most difficult in human history.”

The aircraft could indeed still be in the area planes and ships from several countries have been combing for nearly a week. Currents change the area each day, but on Thursday it was a 223,000-square kilometer (86,000-square mile) patch of ocean 1,680 kilometers (1,040 miles) northwest of Perth.

Each unsuccessful day adds to the skepticism.

“Without any kind of proof, uncertainty rules the day,” said Tim Brown, a satellite imagery expert at GlobalSecurity.org in Alexandria, Virginia. “People still can’t wrap their head around how a modern airplane that big could just go missing in the modern world.”

The focus of the search has changed repeatedly since air traffic controllers lost contact with the Boeing 777 between Malaysia and Vietnam. It began in the South China Sea, then shifted toward the Strait of Malacca to the west, where Malaysian officials eventually confirmed that military radar had detected the plane.

Then came evidence that the plane had continued flying for at least five hours after contact was lost. The plane automatically sent hourly signals to a satellite belonging to Inmarsat, a British company, after the plane’s transponder and all communication systems had shut down. The “pings” did not include specific location information, but the team of experts who studied them said they must have come from one of two vast arcs that ran through both the Southern and Northern hemispheres.

Najib’s announcement reflected a further refinement of that data that determined the aircraft could only have flown south, where it most likely crashed into the sea when it ran out of fuel. Days of costly and fruitless searches off the coast of Perth since then have employed satellites, advanced aircraft and ships, but

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