Originally Posted by
Westcoaster
Great. Back to Google I go to find out what that is...
Thanks for letting us know it worked at check-in for you. In the old days I thought the TSA had to says thumbs up or down some period of time in advance. Nice to know check-in can be soon enough.
I've added my KTN to a reservation after check-in by re-checking in on the mobile app while I'm standing right at the TSA PreCheck line at SeaTac. The boarding card comes back immediately with PreCheck on it.
I do believe that early in the program it was some sort of advance time required, but these days it's instant.