Communter Rail between NOLA and Baton Rouge
I would ride it to New Orleans on visits, for Saints games etc.. for 11.00 or 12.00.
If it made it near Norco Refinery I would take it there as well but absolutely not for 11-12 a day. It would be cheaper to drive.
I see the uses but I also the pitfalls that Jim mentioned too.
Bclemm's is right, they build that Airport and it would work very well.
I know there is some sort of wierd attitude between N.O. and B.R. but the two cities are not that far apart and should work together to build a better economy for both.