What's 300 million going to do for them anyway? Lately I think they'll need the 'assets' in court, the cash wouldn't do them good for long. General likes to say it will unload billions of debt, so from that angle, maybe it makes sense.
Also, any airline that buys either one is going to be limited in what they can do for them. I'm not naive enough to think that Delta can't live without ASA or Comair, but you can't change what either one does in ATL or CVG overnight. Selling it off for a quick buck costs a lot more in the long run.