Originally Posted by
SDF_Traveler
...One thought - I have seen the TSA deploy boarding pass scanners to authenticate boarding passes at a few airports. Perhaps the TSA, at the TDC position, will be using this to match the SecureFlight fields against your ID at some point in the future?
....
They are only scanning the boarding passes to make sure that they are not fake (eg. an online check-in boarding pass may be edited before printing).
SecureFlight fields are only used
BEFORE YOU CHECK-IN for matching your name against the no-fly lists.
It becomes irrelevant after you check-in as
you wouldn't have received a boarding pass in the first place had you either not provided the required SecureFlight information, or if your name matches the no-fly list.