At some level, you have to trust the information you get. There is also good reason to trust it, especially when it comes from a large company such as Boeing:

At some level, you have to trust the information you get. There is also good reason to trust it, especially when it comes from a large company such as Boeing: it is stupid for such an organization to lie to you, because it risks its existence for the rather small payoff of avoiding delays for a single model. It’s even worse for individual employees at the company: they risk jail time and aren’t even the direct beneficiary. Example: see above