I think this might have less to do with insurance and more to do with vicarious liability, acknowledging that UK/US law differs in this respect. Hopefully one of the lawyers will set us straight. In essence (and in the UK!) and employer is liable for the actions of an employee in the course of his/her employment, unless (UK) they have been 'on a frolic of their own, ie their actions are so unexpected and extreme that no employer could reasonably have anticipated or otherwise controlled events. So if this was a process in a UK court, Boeing would have to show that it had no way of knowing or expecting that Forkner would do what he did, or it would be liable for his actions rather than him. Given all that has been written or disclosed so far, and the admissions made in earlier cases, that would be an interesting proposition to put before a court.