A pivotal moment looms as Boeing's largest MAX variant enters the next phase of certification, but lingering issues threaten to derail progress.

Boeing is changing the MAX’s automated flight-control system’s software so that it will take input from both flight-control computers at once instead of using only one on each flight. That might seem ...

Airlines have flown Boeing’s 737 Max jets for just eight years, but in that short time two of them crashed, killing 346 people. The Max was marketed as a more fuel-efficient version of the American ...