sauce
https://www.usatoday.com/story/news/2015/09/23/china-buy-300-boeing-planes/72681578/
https://www.fool.com/investing/general/2015/09/27/did-boeing-just-sell-out-to-china.aspx
https://simpleflying.com/chinas-answer-to-the-boeing-737-the-comac-c919/