TSA PreCheck enrollment runs through third-party providers, not TSA directly — and picking one is literally the first step, since there are only three authorized options: CLEAR, IDEMIA, and Telos. * Once you've picked a provider, most people start with a short online pre-enrollment, roughly 5 minutes, where you fill out basic information and schedule an appointment at a physical enrollment location — though walking in without an appointment is also an option at many sites. * The in-person visit is quick by design, usually around 10 minutes total: the provider checks your identity documents, takes your fingerprints and a photo, and collects payment. Every name on your submitted documents has to match your application exactly — a mismatch, even a minor one like a missing middle initial, is a common reason applications get delayed. * The fee is $85, non-refundable, and covers the background check regardless of the outcome. Most approved applicants receive their Known Traveler Number within 3 to 5 days, though TSA notes some applications can take up to 60 days if additional review is needed. * Getting the KTN doesn't automatically activate PreCheck on your boarding passes — you have to add it to your airline profile or provide it when booking each flight, so it's worth updating your saved traveler profiles with major airlines right after you receive it.