Not only is it a long and expensive process, but the 737 type cert grandfathers in a whole lot of things that would not be permitted in a new type. So they wou

Not only is it a long and expensive process, but the 737 type cert grandfathers in a whole lot of things that would not be permitted in a new type. So they would have to re-engineer a brand new plane from the wheels up. Keeping the 737 type certification was a powerful incentive. Oversight investigation should look in to whether it should have been permitted by the regulator, and what other perverse incentives may exist in the certification process.