Airbus A320 used to have GPWS (Ground Proximity Warning System) as an optional extra. A budget airline didn't order it, and quite possibly encouraged pilots to

Airbus A320 used to have GPWS (Ground Proximity Warning System) as an optional extra. A budget airline didn't order it, and quite possibly encouraged pilots to make excessively fast approaches, and led to a CFIT (Controlled Flight Into Terrain) crash of a perfectly good jet.[0] Another crash related to the 737 MAX crash, is Scandinavian 751 [1]. On a MD-81 airliner, with "Automatic Thrust Restoration", A system the pilots were not trained on, caused the thrust to be increased, when the pilot tried to throttle back the damaged engines and clear the compressor stall. "Pilot Betrayed" was the Air Crash Investigations episode. [0] https://en.wikipedia.org/wiki/Air_Inter_Flight_148 https://en.wikipedia.org/wiki/Air_Inter_Flight_148 [1] https://en.wikipedia.org/wiki/Scandinavian_Airlines_Flight_751 https://en.wikipedia.org/wiki/Scandinavian_Airlines_Flight_7... [2] https://www.imdb.com/title/tt1862850/ https://www.imdb.com/title/tt1862850/