 This is the factory where the wide-body Boeing 747, 767, 777, and 787 are assembled.Plans for the factory were first announced in 1966 for it to be the site of the construction of the 747 after Boeing was awarded a contract worth US$525 million (equivalent to $ million in ) from Pan American World Airways to build 25 747s.It purchased north of the then little-used Paine Field, which was operated by the US Army in World War II.