1) boeing changing geometry 2) boeing adding a new system that takes over control without documenting 3) pushing very hard to classify a new plane as an older t

1) boeing changing geometry 2) boeing adding a new system that takes over control without documenting 3) pushing very hard to classify a new plane as an older type so now retraining happens 4) using only 2 sensors instead of 3, and using just one to control parts of the plane. A series of reasons