NEW YORK - Boeing said Wednesday it would design its new 777X aircraft at five U.S. sites and in Moscow but had made no decision about using its key Washington state facilities.

Boeing Commercial Airplanes recently established multiple engineering design centers as part of a long-term strategic vision, Boeing (IW 500/14) spokesman Marc Birtel said in an email to AFP.

"BCA will utilize these engineering design centers, as well as engineers from non-BCA sites, to design the 777X," he said.

"At this time, no decisions have been made about 777X design or build in Puget Sound," the spokesman said, referring to the Seattle area, where Boeing has a large engineering presence. The 777 is built at its factory in Everett, Wash.

"Much of the detailed design" will be carried out by Boeing engineering teams in Charleston, S.C.; Huntsville, Ala.; Long Beach, Calif.; Philadelphia; and St. Louis, the company told employees in an internal memo seen by AFP.

Boeing's design center in Moscow, Russia, will contribute to the design, it said.

"Our goal is to leverage skills from across the Boeing enterprise. A program of this size requires that we bring together all of the talent that Boeing has to offer," said the memo, signed by Michael Delaney, vice president of engineering, and Scott Fancher, vice president of airplane development.

The executives said that Boeing was "leveraging lessons learned" on the 787 and 747-8 programs to ensure continuity across the 777X program.

"The announced structure will allow for an efficient use of resources and enable Boeing to resolve design issues effectively the first time."

Birtel, Boeing's spokesman, said the spread-out strategy was key to meeting robust demand for commercial aircraft, the biggest portion of the aerospace and defense giant's business.