How Do You Add TSA PreCheck® to EVA Air Adding TSA PreCheck® to your EVA Air reservation ensures smoother security screening at participating US airports. To do so, you'll need to update your Known Traveler Number (KTN) in your reservation. Begin by accessing your booking through EVA Air's website or contacting their customer service directly. Once logged in or connected, navigate to the passenger details section and input your KTN where prompted. Ensure the accuracy of the provided information. After saving the changes, your TSA PreCheck® status should be reflected on your boarding pass, granting you expedited security screening privileges for a hassle-free travel experience.