It’s difficult to attribute the change in course to any system failure, according to the report released Monday. “It is more likely that such maneuvers are due to the systems being manipulated,” the report said.

Experts mapped the Boeing 777’s course only after picking through hourly data hookups with a satellite. Extensive sonar searches of remote waters off Australia’s west coast failed to locate the wreckage.

Monday’s 449-page report offered little to solve modern aviation’s biggest mystery — and stopped short of apportioning specific blame. There’s nothing to suggest the plane was evading radar, or evidence of behavioral changes in the crew, it said. Significant parts of the aircraft’s power system, including the autopilot function, were probably working throughout the flight, the report said.