An Australian businessman based in Hong Kong is campaigning to raise a $US5 million reward for information leading to the missing Malaysian airliner.
Flight MH370 vanished shortly after it took off on a flight from Kuala Lumpur to Beijing on 8 March this year with 239 people on board, including two New Zealanders.
In May, officials concluded that the airliner ended its journey in the Indian Ocean, north-west of the Australian city of Perth. But no trace of the Boeing 777 has been found, nor any reason for its disappearance.
Relatives are demanding answers, prompting the 'Reward MH370' fundraiser campaign.
Ethan Hunt told Radio New Zealand's Checkpoint programme on Monday he is amazed that in the 21st century a jumbo jet can be lost and no one knows where it went, despite 26 governments searching for it.
Mr Hunt said someone knows what has happened and it is hoped the money would encourage a whistleblower to come forward.
"It's been three months and we still believe somebody somewhere knows what happened to the flight. They've suggested it was hijacked - it was certainly taken over and somebody deliberately changed the direction of the aircraft. So in that respect, somebody must know something about that somewhere."
Mr Hunt said the money would allow a whistleblower to start their life anew.