Malaysia Airlines did not meet its own rules for tracking the location of lost Flight MH370 while it was in the air, a new book has claimed.
The Boeing 777, which was carrying 239 passengers and crew, disappeared en route from Kuala Lumpur to Beijing.
Investigators have still not determined the exact course the plane took on March 8, 2014, or recovered all the wreckage.
Now, in The Crash Detectives, journalist Christine Negroni has accused the Kuala Lumpur-based carrier of failing to ensure the doomed aircraft was constantly tracked.
She wrote that company rules said the location of all aeroplanes should be monitored - by sending regular bursts of data to a controller on the ground - "through all phases of the flight".