I got sent through the TSA pre-check line, I think, because I am an AA elite and I was flying AA. I believe I was considered because I checked the box in my AA online account that asked if I wanted to join.
I have no idea what happens next, but I was sent through the TSA precheck line. Ironically, on the same day I was rejected for Global Entry (long story, but CBP seems to think it is a mistake too).
I fly again on Friday out of ORD, so we'll see what happens.