In the runup to the last Paris Air Show two years ago, the 777X development program was going so well that Boeing quietly was discussing potential options with launch operators for advancing initial deliveries by up to three months to early 2020. Fast-forward to today, and the picture is not so rosy. Despite overcoming the challenging development of the aircraft’s new composite wing and folding tip section, establishing a dedicated new 777X assembly system and a rigorous flight-test ...

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