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In this handout image provided by the U.S. Navy, The Bluefin 21, Artemis autonomous underwater vehicle (AUV) is hoisted back on board the Australian Defence Vessel Ocean Shield after successful buoyancy testing April 1, 2014 in the Indian Ocean. Joint Task Force 658 is currently supporting Operation Southern Indian Ocean, searching for the missing Malaysia Airlines flight MH370. The airliner disappeared on March 8 with 239 passengers and crew on board and is suspected to have crashed into the southern Indian Ocean. (Photo by Mass Communication Specialist 1st Class Peter D. Blair/U.S. Navy via Getty
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Able Seaman Marine Technician Trent Goodman keeps lookout onboard HMAS SUCCESS whilst the ship is deployed in search of the missing Malaysia Airlines Flight MH370. *** Local Caption *** Joint Task Force 658 has been established by the ADF to coordinate supporting military forces engaged in the search for missing Malaysia Airlines flight MH370. Under the name Operation SOUTHERN INDIAN OCEAN, ADF assets from the Royal Australian Navy and Royal Australian Air Force have joined the search for debris, recovery and investigation of the missing flight.
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BEIJING, CHINA - AUGUST 07: Chinese relatives of passengers missing on Malaysian Airlines flight MH370 cry as they kneel in front of the media outside the Malaysian Embassy during a protest by relatives on August 7, 2015 in Beijing, China. France expanded its search for debris off Reunion Island Friday a day after Malaysia
BEIJING, CHINA - AUGUST 07: Chinese relatives of passengers missing on Malaysian Airlines flight MH370 cry as they kneel in front of the media outside the Malaysian Embassy during a protest by relatives on August 7, 2015 in Beijing, China. France expanded its search for debris off Reunion Island Friday a day after Malaysia's prime minister announced that a piece of wing discovered last week is from Malaysia Airlines Flight MH 370 which vanished last year. Officials and experts from other countries including the United States and Australia have been more cautious, saying that more investigating needs to be done. (Photo by Kevin Frayer/Getty Images)
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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.

MH370: Did the pilots do it?

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

The plane disappeared on March 8, 2014, on a flight from Kuala Lumpur to Beijing with 239 people aboard.

All of them are presumed dead, but some family members say they’re still holding out hope.

With the two-year anniversary of the Boeing 777’s disappearance comes a legal deadline for next of kin to file for compensation or sue Malaysia Airlines. Zhang Meiling, whose daughter was aboard the flight, said she has refused an offer of compensation and plans to sue, but that’s not what she really wants.

“Can this whole MH370 thing be solved with money? Where are our family members?” she said.

According to Malaysia Airlines, 118 families have started legal proceedings. Not Zhang.

“I only believe this: A mother and daughter’s hearts are connected,” she said. “If something had happened to my daughter, I really would’ve felt it. I think they’re safe.”

Last week a team of experts traveled from Malaysia to Mozambique to examine a piece of debris that may have come from MH370.

Is debris from missing plane?

The piece of debris, which came from the horizontal part of an airliner’s tail, was found by an American tourist in Mozambique and turned over to national authorities.

Officials haven’t said yet whether that plane part matches up.

Investigators have said another piece of debris found on Reunion Island last year does belong to the Malaysian jet.

’An agonizing mystery’

Long after the plane’s disappearance, there are still more questions than answers. Key among them: Where is the wreckage? What caused the plane to go off course? Was it a mechanical fault or deliberate action?

MH370: Did the pilots do it?

Najib said the lingering questions aren’t lost on officials.

“We remain committed to doing everything within our means to solving what is an agonizing mystery for the loved ones of those who were lost,” he said. “On this most difficult of days, our thoughts and prayers are with the families of those who will never be forgotten.”

CNN’s Richard Quest, Sarita Harilela and David McKenzie contributed to this report.