After you book your flight, getting TSA PreCheck is a breeze. Simply access your airline's website or app and navigate to the "Manage booking" or "My trips" section. There you will find an option to update your traveler information. Find the TSA PreCheck field and select it. If the airline supports TSA PreCheck, you will be asked to enter your Known Traveler Number (KTN). Once submitted, your TSA PreCheck status will be added to your reservation, granting you expedited security screening privileges for smoother travel through airports, saving you time and hassle during your travels.