Originally Posted by
FlyerGoldII
I agree with the post. On line check-in will NOT get TSA precheck (with AC) for now; only airport check-in with agent or at kiosk.
However, if you go to airport and re-print the boarding pass, you may get TSA precheck indicated on the new boarding pass.
Both online or mobile check-in will still get you Pre✓ if you're eligible and TSA clears you - there will be a note on the web boarding pass page or the check-in complete page on mobile informing you that you've been cleared and you'll need to reprint your boarding pass at the airport.