Two Boeing 737 Max aircraft crashed because they didn't have a backup angle-of-attack sensor. According to a former NTSB director, "this is a fairly simple exte

Two Boeing 737 Max aircraft crashed because they didn't have a backup angle-of-attack sensor. According to a former NTSB director, "this is a fairly simple external device that can get damaged on a regular basis." https://www.cnn.com/2019/04/30/politics/boeing-sensor-737-max-faa/index.html https://www.cnn.com/2019/04/30/politics/boeing-sensor-737-ma... I'm guessing the reason they didn't put a lifesaving backup sensor on the plane might be sorta similar to the reason they don't add high-definition cameras in case of UFOs.