The pilot of the missing Malaysian Airlines flight MH370 took the plane down in a murder-suicide, a new documentary has claimed. Zaharie Ahmad Shah, who said “goodnight” to air traffic control in Malaysia before the plane vanished, is speculated to have flown the aircraft for seven hours after cutting contact with authorities. The MH370 flight, which crashed in March 2014 around 38 minutes after leaving Kuala Lumper Airport, carried 227 passengers and 12 crew on board. Since it vanished a decade ago, no wreckage has ever been discovered despite extensive searches for the ill-fated plane. A new…