The primary advantage of CLEAR over TSA PreCheck is that it allows you to skip the identification check line entirely. While TSA PreCheck gives you an expedited "physical" screening (keeping shoes and jackets on), you still have to wait in a line to show your ID and boarding pass to a TSA officer. CLEAR uses biometric data (eye scans or fingerprints) at a dedicated kiosk to verify your identity in seconds. Once verified, a CLEAR ambassador escorts you directly to the front of the security screening area. When you have both CLEAR and TSA PreCheck, you essentially bypass the ID line and then enter the expedited physical screening lane, creating the fastest possible airport experience. Additionally, CLEAR is a private company and its membership can also be used for expedited entry at many sports stadiums and concert venues across the US, whereas TSA PreCheck is strictly for airport security. However, CLEAR is significantly more expensive ($189+/year) compared to PreCheck ($78 for 5 years), making it most valuable for very frequent travelers.