Australia says it still hopes Malaysia Airlines Flight 370 is found one day as the latest search of the seabed in a remote part of the Indian Ocean comes to a close on Tuesday.

Last week, Malaysia said the search by Texas-based company Ocean Infinity would end on Tuesday after two extensions of the original 90-day time limit. A total of 239 people were on board the flight when it disappeared on the morning of March 8th, 2014. Family members of those on board want the Malaysian government to continue searching for the missing aircraft. But a growing chorus of aviation specialists believe the plane's location remains a mystery because it was hijacked by the pilot - and purposely crashed with the goal of it never being found. Greg Navarro has more.

For more than 4 years, Jacquinta Gomes has lived with the pain of losing her husband Patrick, and the unanswered questions surrounding his death.

JACQUINTA GOMES VICTIM'S WIFE  "In my faith, I can have closure but not when I don't know what happened."

In March of 2014, Gomes was one of 239 people on Malaysian Airlines Flight 370 bound for Beijing which disappeared shortly after taking off from Kuala Lumpur. The Australian government led an extensive and expensive search across a 120,000 square kilometre section of the Southern Indian Ocean. Despite the discovery of pieces of the aircraft, the search came up empty.

A second search was launched earlier this year by a private company on a "no find no fee basis"- that too has failed to find the plane.

GREG NAVARRO SYDNEY "The initial search was based on the premise by the Australian Transport Safety Bureau that in MH370's final moments, then plane was being flown by the auto pilot, it ran out of fuel, and crashed into the ocean."

For more than 4 years, pilot Byron Bailey has insisted that efforts to find MH370 have focused on the wrong areas. That's because Bailey and an increasing number of pilots believe the prevailing theory about what happened to the Boeing triple 7 - has been incorrect from the start.

BYRON BAILEY PILOT "When they had discovered that the aircraft had flown into the Southern Indian Ocean it had to be a pilot hijack because only a pilot can reprogram the sophisticated flight management system computers."

Bailey and others also point to the discovery by the FBI that pilot Zaharie Shah had flown a disturbingly similar route on a home flight simulator to the one actually taken, only weeks before the ill-fated journey.

PETER MAROSSZEKY MANAGING DIRECTOR, AEROSPACE DEVELOPMENT "You can easily say oh look, he was practising his flying skills at home or keeping up to date but the coincidences are a little bit too strong."

BYRON BAILEY PILOT "He wanted to hide the aircraft in as remote position as possible. He didn't want bits of debris floating around, he didn't want it to ever be found."

Earlier this month, the head of the ATSB appeared before Australian lawmakers where he reluctantly acknowledged the pilot hijacking theory.

PETER FOLEY AUSTRALIAN TRANSPORT SAFETY BUREAU "So there is one possible - I'm not saying that it happened and I hate to speculate, but it's at least one plausible scenario."

Jacquinta Gomes and many other family members want the Malaysian government to continue to search for MH370.

JACQUINTA GOMES VICTIM'S WIFE  "This is not only about finding the plane, but also securing the fate of others who travel you know."

Malaysia's government says it plans to release a full report on the investigation into MH370's disappearance - but hasn't given a date on when that will happen. Greg Navarro, CGTN, Sydney.