Cities and routes are constantly changing. MSY, as a general rule, we don't service. It's a big market so it's all mainline and some E175. Occasionally on a weekend we'll cover a IAH-MSY turn.
But if you like Louisiana, we have several other cities there we service frequently: Monroe (sucks), Lafayette (haven't done it), Baton Rouge (did the long once, on the river but nothing special), Shreveport (the long is kinda ok, there's an outlet mall across the bridge), Alexandria (not terrible but nothing special).
I still say the best overnights are Mexico and the long Canadians.