Very interesting….
After the 9/11 Boeing (but I guess Airbus also) have installed in their planes a Honeywell system which allows to take control of the plane from outside, this in order to counter a terrorist attack.
But it seems that this system is also accessible to bad guys.
I could explain how the flight MH370 has disappeared.
https://fr.sputniknews.com/international/201712141034336671-boeing-malaisien-disparu/