[CivBase]

Boeing's assets would be sold and someone else would use them to service a market in need of competition. I can think of a few parties who I suspect would be interested. All you have to do is bar AirBus from purchasing those assets.

I doubt AirBus would want those assets anyways. It would make them an obvious monopoly and invite even more regulation than they're already facing.

Companies rarely outright disappear. They get absorbed and operate under new management.