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Each plane on the line is numbered. Dreamliner No. 2, seen from behind, is prepped to receive its vertical stabilizer at the factory in Everett, Wash., the world's largest building by volume. Unlike the massive, fixed structures used to build other planes, all the tooling for the 787 is mobile, bringing parts together under guidance from a global positioning system. Boeing hopes the system will reduce final assembly to three days. A comparable aluminum plane requires four months to build from scratch.

Last updated April 23 2008: 10:17 AM ET