In a few weeks, I'll be taking a domestic flight that includes a long (3.5 hours) layover. I'd like to leave the airport and have lunch with a friend who lives nearby. I have TSA Pre-check. Assuming I am approved for Precheck for my airport of origin, if I leave the connecting airport during my layover, can I use Precheck lines to reenter the airport there? Or is the pre-check approval specific to the airport of origin?
TSA pre-check will be indicated (or not) on each boarding pass for your journey. Providing you are travelling through an approved airport on an approved airline, you should receive pre-check on all segments of your journey.