Fly,
Just for the record, CAL had 2 bankruptcies and they are the lone lone airline that has survived being in BK twice - maybe U will be the second, maybe not.
As for a plan, there could be one (farfetched as it is) and it involves USA320Pilot's "corporate combination" theory. For $100 million or so, someone could buy U lock, stock, and barrel and pay about a 50% premium to current stock price. Cherry pick some assets, pay off the ATSB, and convert the BK to chapter 7. Instant capacity reduction in the industry.
Obviously an outside investor probably wouldn't do that, though it would depend on what they thought the assets were worth vs the debt that had to be paid. But an airline with plenty of cash in it's pocket? That's the more interesting possibility. There are a couple or three of them out there, and if the result was being able to raise fares by $5 or $10 per ticket, the return on investment looks pretty good.
Jim
ps - change UAL for U and the cost would be about $200 million, but the theory still holds.