One thing you may want to consider is whether or not you are in CASS. I don't know what your status with your airline is, but if you're not qualified and current, I know that my airline pulls you out of CASS (in fact, taking mil leave for a drill weekend causes them to yank me out of CASS...ridiculous...but I digress). If you're going to travel offline, you may run into an issue where the gate agents try to run you in CASS, regardless of whether or not you intend to sit in the back (and have a reciprocal JS agreement). If they can't find you, expect a hassle trying to get on the flight.

I don't know if this will happen, but I know it has for me when trying to get home (OAL JS) to attend drill weekend and not showing up in CASS. Good luck.