They recently moved the TSA-precheck line to a different area; this is the whole reason for this post. Delta agents at the SP check-in areas will often tell you that it was recently moved--Delta know its annoying but that they allegedly had no control over it.

I know there was a reason for it, but it wasn't something I committed to memory as I've never qualified for Pre-check since apparently I hit PM and then DM by the time the TSA stopped giving those away like candy.