zhina--
Uhm, UAL has about $2 billion in liquid assets and $1.5 billion in receivables -- against $7 billion in current liabilities and $9 billion in long-term debt. Net tangible book is $1.3 billion and market capitalization is $50 million. Something tells me this isn't going to wash well for the common shareholders.
That said, traders on the right side of the speculative frenzy as the common goes to zero can get lucky and make some green. Those people who rode WCOM from 0.06 to the 0.20s--. I'd never go for it, but these stocks often have a lot of volatility in their dying days. Just be sure you're out, instead of in, when the music stops.