Malaysian officials initially appeared keen not to direct any suspicion towards Zaharie or his co-pilot, 27-year-old Fariq Abdul Hamid, who was last week revealed to have invited two women passengers into the cockpit and smoked on an earlier flight to Phuket.
But evidence of the way the plane’s transponder and communication systems were disabled and the way the plane was expertly flown over the Indian Ocean apparently using navigational waypoints meant only a skilled aviator could have been at the controls. Investigators were also baffled by why, if hijackers took over the plane, there was no Mayday call or signal from the two pilots to say the cockpit had been breached.