Just FYI, if you have 2 itins on the same day, or an itin within 24 hours you cant check in for anything but the first outbound segment of the itin..

you have to fly one leg befroe checking in for a return, or another official 'segment' of your itin.

I'm off BHM-ATL-PHX at around 6pm this afternoon, and returning 6am tomorrow. I can check in for the first, but not the second.
I've done this a few times, but never thought to post on here in case someone needs the info. After my first leg, I'll go to the CRC in ATL and they can check me for the return flights. I have no printer for my laptop and dont like dealing with airport check in's anyway.

Just for your info if you need it in the future..