Boeing has completed firm configuration for the 777-9X variant of the 777X program. The 777-9X will seat approximately 400 passengers and have a range of more than 7,500 nautical miles. It is slated to enter service in 2020, followed by the smaller 777-8X in 2022. “The firm configuration milestone marks the completion of configuration trade studies required to finalize the airplane’s capability and basic design,” Boeing said in a statement. “Wind tunnel ...

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