To verify that your TSA PreCheck status is active for a specific flight, you must look for a specific indicator directly on your boarding pass, whether it is a paper copy or a digital version on your smartphone. On most boarding passes, the words "TSA PRECHK" or the TSA PreCheck logo will appear clearly, typically near your name or the barcode. If you are using a mobile app, the logo often appears in the top-right corner. It is important to note that simply having a Known Traveler Number (KTN) does not guarantee PreCheck for every flight; the airline must have your KTN on file at the time the boarding pass is generated. If you do not see the indicator, you cannot use the expedited lane. In such cases, you should visit the check-in counter to ensure your KTN is correctly attached to your reservation, though updates made at the last minute may not always trigger a new pass with the status.