Well, I can tell you Continental has taken all its aircraft out of Houston (IAH) this afternoon (Fri) and has nothing planned to go in again until Sunday evening but it'll be a mess.
Remember many of the Houston employees (80% of CAL, COEX etc) are staying with their grannies in Austin or wherever so I wouldn't expect there to be anyone turning up for work until Monday. Anyway, Continental, at least, will waive any change fees if you travel by the 24th
There'll be a fair number of airline employees losing their homes tonight.