So I got global entry a few weeks ago and added my known traveler number and have been getting pre-check consistently on about a flights since then. The only delay has been people ahead of me arguing with TSA about not getting pre check. Maybe I am missing something but I can only assume when you don't see TSA pre check on your ticket that simply means you were not selected. Are these people missing something so simple or are they trying to argue their way through the TSA agent? Has anyone had the check on their ticket or phone app and not got the three beeps?