A big part of the Max’s sales proposition was that it shared a type certification with the old 737. This meant that pilots would need minimal retraining, and co

A big part of the Max’s sales proposition was that it shared a type certification with the old 737. This meant that pilots would need minimal retraining, and could easily swap back and forth between the two easily. This requirement is why the MCAS software wasn’t properly documented; to avoid expensive retraining requirements that would be unattractive to buyers. Ignoring the training issue (which is already long gone), the inability to take the Max abroad would be a serious hindrance for sales. It means that it would require that airlines track them separately for routes, making sure to never take the Max 8 outside of America, which is exactly what Boeing was hoping not to do with the Max 8.