https://www.washingtonpost.com/local/trafficandcommuting/text-messages-show-boeing-employees-knew-in-2016-of-problems-that-turned-deadly-on-the-737-max/2019/10/18/8578c990-f1ca-11e9-89eb-ec56cd414732_story.html
origin - https://www.pipiscrew.com/?p=15554 messages-show-boeing-employees-knew-in-2016-of-problems-that-turned-deadly-on-the-737-max