Utilize the input text as a context reference, choose the right relationship between Boeing and Seattle from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Amazon.com Inc., Microsoft Corp. and Boeing Co. have bases in the Seattle area.

Answer: location_of_formation