But suspicion of Capt Zaharie emerged within a week of MH370's disappearance as the Chinese government intensified pressure on Malaysia to explain the mystery and find the missing plane. More than 150 of its 227 passengers were Chinese nationals.
Detectives raided Capt Zaharie's home in Kuala Lumpur and took away his flight simulator as part of their investigation as tracking information from the British Inmarsat satellite company indicated the flight had not plunged into the South China Sea off Malaysia's east cost close to Vietnam as feared but had doubled back across the Malay Peninsula, turned left and headed towards the southern Indian Ocean.
Its movement indicated it had been deliberately diverted but there is no evidence yet to conclude who was responsible.
On Friday, shortly before new details of Capt Zaharie's deleted simulator flight path emerged, Malaysia's acting transport minister, Datuk Seri Hishammuddin Hussein, said his search team would soon begin looking in a new area in the southern Indian Ocean corridor suggested by a new analysis.
"We have to continue with the lead because the best lead we have is based on the handshake on the Inmarsat [satellite data] and still in the southern corridor", he said.
Sources close to the investigation confirmed to The Telegraph on Sunday that a deleted flight path had been recovered from Capt Zaharie's simulator which had been used to practice landing an aircraft on a small runway on an unnamed island in the far southern Indian Ocean.
The discovery leaves Capt Zaharie as the prime suspect in a crime which cannot yet be proven to have been committed – and Malaysian police have been careful in their public comments to stress that all leads are still being investigated and no conclusions have been reached.
At a press conference in Kuala Lumpur on March 16, however, Malaysia's chief of police Khalid Abu Bakar said he believed the plane had been diverted by hijackers, saboteurs or someone with a personal vendetta or psychological problem. Friends and relatives of Capt Zaharie denied he had any motive for hijacking his own plane and described him as a warm and helpful man who was committed to social work.
He had campaigned for the mainstream People's Justice Party of former deputy prime minister Anwar Ibrahim and did not support Islamic extremists, party worker Sivarasa Rasiah told The Telegraph shortly after the plane disappeared.
"He comes across as a really likeable guy, a warm guy. There is absolutely no way he is doing this of his own volition," he said.