Main line flights have been cancelled for Friday starting about 9am out of IAH. I had DCA-IAH-SAN departing at 6:15am DCA (still flying) but 9am IAH-SAN cancelled and everything else that day.

So if you are flying out of IAH after 9am Friday - you are likely cancelled.
Problem is that CO can not reroute me on any flights through CLE or EWR to SAN on Fri 9/23 or even on Sat 9/24. Best they could do is Sunday morning DCA-SAN, but then I would arrive after my return flight.

I was willing to go next weekend - but flights are pretty full and they will not put you in a seat without the same fare code. This does not make sense to me. So next weekend is not an option. First available flight in my fare code is Dec. 2-4th (for a weekend trip). So my options are refund or rebook for Dec 2.

Turns out a fare code cheaper than what I have is available for Dec. 2-4 - so it was best for me to cancel and just rebook the new flight on Dec 2nd and get about $60 back.

So before you rebook, check and see if a cheaper fare my be available.

I had the same situation going to MSY during Katrina - refund was only option. CO's policy needs changed - if your flight is cancelled, they should let you book the same itinerary say the next week - days/times, if any seat is available.

My outbound could be rebooked from 9/23 to 9/25 without regard to fare code (because of no availability until 9/25) but my return would have to have the same fare code even though my outbound arrives before my return.