Originally Posted by
smartytravel
The legend has it that you should be able to add at the online check-in.
Indeed, do it during OLCI on the website even if it won't give you bp. There was a report a while ago that the app does not allow you to add the KTN.
I find it completely unacceptable that an airline is part of TSA Pre for 6+ years and STILL no way to efficiently store the KTN.