Last I heard, both Louis Armstrong International (KMSY) and Lakefront (KNEW) were closed to all traffic, flooded and unusable. Not sure if that's still true.
}:-)4
Most small planes would have the range to fly from some alternate location to NOLA, drop items, and return to base.
Anyone with a private helicopter of the Jetranger class or larger in the area should be heading for the area with their craft. They need all the choppers they can get.