Out of sheer macabre curiosity, I just checked an online travel agent, and you can still, in fact, buy airplane tickets to and from New Orleans. And at reasonable prices too, for dates only a couple of days from now. Odd, considering it's a city that basically no longer exists, a sort of modern Pompeii, only a lot larger proportion of the population managed to get out in time (into what?). Maybe the airport was spared. (Quite likely...) Even so, quite creepy. Maybe they just haven't managed to update the databases.
Airlines are, apparently, flying relief missions into there. Even Fedex.