Boeing's overestimation of the 737 Max's safety may have been prompted in part by a simple but dangerous problem: many of the people involved weren't aware of the changes. The New York Times has claimed that some engineers, testers and regulators were unaware Boeing had made the jet's MCAS anti-stall system far more aggressive. They operated on the assumption the technology relied on two sensors when it was using just one, and a "compartmentalized approach" to development left key engineers without a full understanding of how the system worked. Moreover, the aircraft maker reportedly didn't...