The BR judge really doesn't decide, and he hasn't decided yet unless you mean what happens in the interim.

UA has 180 days to submit a plan for approval. The creditors get to vote on it. After 180 days (can be extended) creditors can submit a plan. Its who ever drafts the approved plan that decides what happens to the mileage plan.

No plan has been confirmed yet and probably will not be confirmed for at least a year.

Again, they are unlikey to dismantly the plan, although with a smaller carrier like US that is more a possibility since they theoretically might merge or be sold off in parts.