SWA has suspended operations at Hobby until the afternoon of the second. They can't staff ground ops when folks are recovering from a disaster, access is limited, and infrastructure at the airport is damaged or destroyed.
I suspect that date may even be a little optimistic, as they are just now coming to grips with the magnitude of the flooding damage. The people who staff the airports and make things happen need to feel safe and have their families taken care of prior to returning to work. That may be a long time for some folks.