Great article in July The Atlantic on why the pilot is most likely behind the disappearance over five years ago. A most likely case scenario has been put forth in the piece. And the little known facts the Malaysian Government may work fiercely to hide and avoid blame in the plane's loss along with its many passengers.
https://www.theatlantic.com/magazine/archive/2019/07/mh370-malaysia-airlines/590653/
https://www.theatlantic.com/magazine/archive/2019/07/mh370-malaysia-airlines/590653/