They disabled the Boeing Honeywell Uninterruptible Autopilot, installed after the 9/11 events which allows to take complete control of a plane from the ground.
https:// en.wikipedia.org/wiki/Boeing_Honeywell_Uninterruptible_Autopilot
AIDS :
https:// en.wikipedia.org/wiki/Malaysia_Airlines_Flight_17
Navy Seals :
http:// www.history.com/news/the-costliest-day-in-seal-team-six-history