http://americanmachinist.com/news/boeing-source-major-structural-parts-japan

http://www.themanufacturer.com/articles/boeing-signs-formal-agreement-with-japanese-partners-for-the-new-777x/

Boeing noted it has partnered with Japanese aerospace companies for almost 50 years to develop and manufacture several of its jet series, including various iterations of the 737, 747, 767, 777, and 787. It said it spent more than $4 billion for goods and services in Japan last year.

“Participating as a partner in the next generation 777X program is another significant step for Japan Aircraft Industries, following the success of today’s best-selling 777,” according to Hideaki Omiya, chairman of JADC and chairman of MHI.