I've checked some of the scanner feeds:
NAS New Orleans, aka "Belle Chasse" has been active on the radio during the emergency, (also using callsign Navy New Orleans).
Can't speak as to whether it's been operational after the hurricane -- I imagine it has -- but it certainly was before. The big problem right now is the "last mile": getting the information out of the streets, and the aid in.
The internet feed I get is largely limited to ANG and USCG communications, with a bit of NO air traffic (advisories, not control; provided by AWACS), but you do hear Belle chasse come up quite a bit.
Anyway, traffic is going through MSY, and there's plenty of calls for
gonzales regional airport, with traffic landing/departing rwy 35, but that's just because their frequency (123.00) is also listed on the "scanned frequency list" as:
123.00000 Air to Air.
Anyway, for the Hurricane Katrina radio information (including all known internet feeds), look here:
here, and for those trying to process that information, look
here .