Originally Posted by
DaveReidUK
Particularly when you consider that "AOA DISAGREE" warning functionality is fitted to many 737 Max aircraft.
Apparently this is an additionally chargeable option. All three major US customers (Southwest, American, United) have bought it. Lion and Ethiopian did not. I wonder about others.
And I wonder how the Boeing sales team went about selling this add-on. Why did the US carriers spend the money and others not. Presumably the sales team offered it to everyone. What were their justifications, and why did the US carriers, no fools at tough negotiations, go for it but not others. And how did the FAA certification let it be optional rather than required. How often, for those that fitted it, did it operate ?