'Switched off'
Police have searched the homes of Captain Zaharie Shah, 53, and Mr Hamid, 27. A flight simulator taken from the captain's home was being reassembled and examined at police headquarters, officials said.
Investigators are also looking at passengers, engineers and other ground staff who may have had contact with the aircraft before take-off.
The plane left Kuala Lumpur for Beijing at 00:40 local time (16:40 GMT) on 8 March.
Officials say the sign-off to air traffic controllers came at 01:19 as it left Malaysian airspace.
The last transmission from the plane's Aircraft and Communications Addressing and Reporting System (ACARS) was received at 01:07.
"We don't know when the ACARS was switched off after that," Mr Ahmad Jauhari said. "It was supposed to transmit 30 minutes from there, but that transmission did not come through."
It disappeared off air traffic controllers' screens at 01:21, when it was over the South China Sea.
Malaysia's Prime Minister Najib Razak said on Saturday that satellite and radar evidence showed the plane had changed course and could have continued flying for a further seven hours.
'Anguish'
Searches have started in two air corridors - one stretching from the border of Kazakhstan and Turkmenistan to northern Thailand, and another from Indonesia to the Indian Ocean.
"Today, I can confirm that search and rescue operations in the northern and southern corridors have already begun," Malaysian Transport Minister Hishammuddin Hussein told a press conference on Monday.
Australian Prime Minister Tony Abbott said on Monday he had agreed to take the lead in scouring the southern Indian Ocean for the "ill-fated aircraft".
Mr Hussein said: "Over the past two days, we have been recalibrating the search for MH370.
'Switched off'
Police have searched the homes of Captain Zaharie Shah, 53, and Mr Hamid, 27. A flight simulator taken from the captain's home was being reassembled and examined at police headquarters, officials said.
Investigators are also looking at passengers, engineers and other ground staff who may have had contact with the aircraft before take-off.
The plane left Kuala Lumpur for Beijing at 00:40 local time (16:40 GMT) on 8 March.
Officials say the sign-off to air traffic controllers came at 01:19 as it left Malaysian airspace.
The last transmission from the plane's Aircraft and Communications Addressing and Reporting System (ACARS) was received at 01:07.
"We don't know when the ACARS was switched off after that," Mr Ahmad Jauhari said. "It was supposed to transmit 30 minutes from there, but that transmission did not come through."
It disappeared off air traffic controllers' screens at 01:21, when it was over the South China Sea.
Malaysia's Prime Minister Najib Razak said on Saturday that satellite and radar evidence showed the plane had changed course and could have continued flying for a further seven hours.
'Anguish'
Searches have started in two air corridors - one stretching from the border of Kazakhstan and Turkmenistan to northern Thailand, and another from Indonesia to the Indian Ocean.
"Today, I can confirm that search and rescue operations in the northern and southern corridors have already begun," Malaysian Transport Minister Hishammuddin Hussein told a press conference on Monday.
Australian Prime Minister Tony Abbott said on Monday he had agreed to take the lead in scouring the southern Indian Ocean for the "ill-fated aircraft".
Mr Hussein said: "Over the past two days, we have been recalibrating the search for MH370.
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