Boeing is downright spiteful to employees who have been issued, PIPs in most cases unjustifiably. 10 out of 10 employees issued PIPs at Boeing are terminated. Boeing HR purposely defines PIPs to ensure employee failure.
What PIPs allows Boeing to do, which is their real motivation on slapping them on employees, is to allow Boeing to terminate employees without having to pay the effected employees unemployment benefits or their full PTO, dollar for dollar. It is also a career ki-ler having received a PIP from Boeing. If you are foolish to use Boeing as a reference, after separating with Boeing which is nearly impossible not to, Boeing, HR, when contacted will go out of their way to hurt your chances of the job offer standing, Boeing HR may even suggest to the prospective employer to withdraw the job offer to you, and there lies how spiteful Boeing can be.
Nothing but the truth from @pjt+1vEIIo5X.