Perhaps someone said it earlier, but just because you're 1k doesn't mean you're not a security risk. Goodness knows, I've seen a lot of loony Global Service types. Plus all of the miles could be accrued on round trips to...uh...Syria. The known traveler program involves a records review (in theory) so, there is at least a small improvement in security over the ff status driven criteria. As for me, I've seen far too many unaware travelers in the pre check lines lately and it drives me bonkers when they proceed to strip down and search for liquids in carry ons.