"It's great to see the airlines and industry team side-by-side with us as we achieve this important milestone," said Bob Feldmann, vice president and general manager of the 777X program, Boeing Commercial Airplanes. "The team has followed a disciplined process to complete all of the requirements for this stage of the program."

The firm configuration milestone marks the completion of configuration trade studies required to finalize the airplane's capability and basic design. Wind tunnel test results, aerodynamic performance and structural loads are also evaluated to ensure the airplane meets requirements. This allows the 777X team to begin detailed design of parts, assemblies and other systems for the airplane. As detailed designs are completed and released, production can begin.

"The program is right where we want it to be," added Feldmann. "We have an airplane and production system that are on track and on schedule, and we remain laser focused on meeting our commitments to our customers."