On March 8, 2014, Malaysia Airlines flight MH370 was en route from Kuala Lumpur to Beijing.
Barely an hour into the flight, the plane’s communications equipment shut down or stopped working.
After that, the plane must have made a U-turn and continued to fly for up to eight hours.
Several weeks later, search vessels picked up signals believed to come from MH370’s so-called black boxes, in the Indian Ocean 150 land miles west of Australia. But after that, the boxes’ batteries are estimated to have run out. The signals have since also been questioned.