The plan laid out in a memo to Boeing workers on Wednesday confirms suspicions that Boeing has been looking to move design work to engineers elsewhere.
The company said much of the design work will be done in Charleston, S.C.; Huntsville, Ala.; Long Beach, Calif.; Philadelphia and St. Louis. Some work will also be done in Moscow.
The 777 first flew in 1994, and it's one of Boeing's best-sellers. It is Boeing's second-biggest plane, commonly used for long-haul international flights. Boeing is expected to formally offer a revamped version for sale by the end of this year.
The memo said no decisions have been made about how much of the new 777 will be built around Seattle. The current 777 is built in Everett, just north of Seattle.
Significant chunks of Boeing's newest plane, the 787, were designed outside of Washington, and Boeing built a factory in South Carolina to assemble some 787s along with those it assembles in Everett. Boeing executives have made it clear that future design and assembly work won't automatically be done in Everett, where the workforce is mostly unionized.