Originally Posted by TSAPressSec

But yes, this is correct. The vast majority of passengers who experience TSA Pre✓™ have been, and will continue to be, screened via a walk-through metal detector. However, we are expanding the use of Advanced Imaging Technology (AIT) at TSA Pre✓™ checkpoints through a phased approach.

With the utilization of AIT at select TSA Pre✓™ checkpoints, a random generator on each walk-through metal detector may direct a passenger to be screened via an AIT unit; happened to me Monday, and added less than 30-second to my screening.