Random side note while digging around a bit; it seems that while AA &amp; SWA paid up for the AoA avionics for 737 MAX planes, United was relying on "other data" to fly their planes.  WTF?  


 [https://www.nytimes.com/2019/03/21/business/boeing-safety-features-charge.html](https://www.nytimes.com/2019/03/21/business/boeing-safety-features-charge.html) 

"American Airlines, which ordered 100 of the planes and has 24 in its fleet, bought both the angle of attack indicator and the disagree light, the company said.

Southwest Airlines, which ordered 280 of the planes and counts 36 in its fleet so far, had already purchased the disagree alert option, and it also installed an angle of attack indicator in a display mounted above the pilots’ heads. After the Lion Air crash, Southwest said it would modify its 737 Max fleet to place the angle of attack indicator on the pilots’ main computer screens.

United Airlines, which ordered 137 of the planes and has received 14, did not select the indicators or the disagree light. A United spokesman said the airline ***does not include the features because its pilots use other data to fly the plane.***"