Depending on the court, plea deals can be a horrible gamble by a defendant. Generally you have to enter your guilty plea first, and then the judge decides if they want to let you have that sweet, sweet sentence the prosecution offered.

I know someone who went to court having been offered a plea deal for probation and got 80 years instead when the judge rejected it and sentenced them.

Boeing isn't pleading guilty on its own - it's also agreed to damages.

I agree that a defendant pleading guilty on their own (and throwing themselves on the mercy of the court) would be hard to reject. That isn't what's happened here - the prosecution has, presumably, agreed to the damages, so this is a plea deal, right?