A Boeing 777X aircraft performs a demonstration flight at the 2021 Dubai Airshow in the Gulf emirate on November 14, 2021. (Photo by Giuseppe CACACE / AFP) (Photo by GIUSEPPE CACACE/AFP via Getty Images)AFP via Getty ImagesBoeing’s next-generation widebody aircraft program—the 777X—is delayed once again. The jet program launched in 2013 with a planned 2020 debut, but is now not expected to carry its first paying passengers until 2027. The slip reflects the complexities of designing and certifying a revoluti ...