Story highlights Tuesday marks the two-year anniversary of the disappearance of MH370

All 239 people aboard the Boeing 777 are presumed dead

Malaysia's Prime Minister says he's "hopeful" the plane will be found

(CNN) Two years after Malaysia Airlines Flight 370 vanished from radar screens, investigators say they still believe the missing airliner will be found.

The search operation to find the plane is expected to be completed later this year, Malaysian Prime Minister Najib Razak said in a statement Tuesday.

"We remain hopeful that MH370 will be found in the 120,000-square-kilometer area under investigation," Najib said.

If it isn't, officials said, Malaysia, Australia and China will meet to determine the next step.

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