To answer the original poster, liquidity is a sticky wicket. You can look at the financials to figure out available cash and short-term securities, but they don't typically disclose other relevant things like encumbered/unencumbered aircraft & assets.
I don't see UAL being in a Ch.7 -- they still have a valuable franchise that someone will try to acquire. Likewise for AS, HA, and to a lesser degree, B6.
US? Forget it. They'll rot on the courthouse steps. Likewise for YX, F9, FL, and NK. They're disposable capacity and not exactly unique networks.
If UAL tries to sell MP for billions, they seriously risk having someone's ass hauled into court for perjury, because they claimed a far lower value when they were dumping their pensions on PBGC. And it's not out of the question that the PBGC would try to attach the proceeds of a sale to UAL's claim...
UAL did wind up with about 100 unencumbered aircraft following their emergence from bankruptcy, but as mentioned, if they're the 2nd gen 733's and 735's, they're not exactly marketable. It just means they're free and clear. Nothing more than that. If they still have a few 777's which are unencumbered, they might be able to get into a sale/leaseback to generate cash, or they might be able to sell the shell. But as you said, burning the furniture has consequences.