It was MCAS.
Here is the crux of what Will Langewiesche said:
- the Malay government purposefully misled the initial investigation, the initial search, everything because right away they knew the pilot was flying the aircraft like a crazy person based on the radar data they had
- same government has also stifled all investigations, misled media, and lied to the FAA, FBI, and other investigative bodies on the mental health of the pilot Zaharie Ahmad Shah.
- Zaharie had MSX on his computer, which BTW, had the same route of a planned flight on the game which he then took the MH370 on the same flight weeks later
- Zaharie was depressed, and probably not in a good space. Similar to other pilots who flew their aircraft into the water/mountains - like EgyptAir and others
- his best friend is convinced that Zaharie is 100% responsible for the accident, and the Malay government for the cover-up (like any dictatorship would do).
- Will goes into the most-likely scenario on how he did it. He had the co-pilot leave the cockpit, donned his air mask, turned off the air into the plane for 40-50 minutes, turned it back on, and then flew the plane until it ran out of gas and nose-dived the airplane into the sea which broke up into a billion pieces at a high rate of speed (15000+fpm impact).
- the reason why no wreckage debris site was ever found was the the Malaysian government, on purpose, sent S&R and other investigating bodies to the wrong area, thousands of miles away, so the plane wouldn't be found and they not held responsible.
- to put it into perspective, the Air France airplane that crashed - they knew EXACTLY where it hit the water, and it took them two years to find the aircraft.
- bits and pieces of the aircraft have been showing up all along the coast of Madagascar and other surrounding areas. All showing high-speed impact damage.
- what Mike also said. Blaine Gibson volunteered his own time - but now is facing death threats - possibly from China/Malaysia authorities.