Originally Posted by
oklAAhoma
Not online there's not. No seat assignment means no way to check in online which means no way to print a boarding pass/security pass ahead of time.
I'll note that Delta (as well as United, according to the OP) allows online check-in without a seat assignment. You get a boarding pass-like piece of paper which says "SEAT REQUEST" (a rather better term than AA's "priority verification") with which you can go straight to the gate.
Would be nice if AA allowed this too.