United and American fly puddle jumpers to IAH and DFW, respectively, and I have to change terminals which stinks when they have to store my luggage below and I have a time crunch in between flights. With Delta I find ATL much more user friendly than IAH and DFW. I might be in the minority by saying I like ATL, but I find it an extremely efficient airport. I don't mind going a little out of the way to ATL. After my last two trips I'm pretty much done with Southwest. Good prices but a pain in the butt to fly from PNS.