I've definitely seen them recently at LGA, JFK, and MIA. I have pre-check but my complaion doesn't. Interestingly AA doesn't grant Pre-check to companions on the same PNR, so had to send her through the priority lanes while I went to pre-check to avoid shoes/laptop hassles. (UA does grant pre-check to same PNR companions, don't know if it's for elites only or for everyone).