
According to Business Insider, seeing “SSSS” printed on the bottom of your boarding pass means that you’re about to become mighty familiar with the staff at TSA (Transportation Security Administration). Why? Well, because those four letters mean that you’re the lucky soul who’s been pre-selected for additional security screening.
The “SSSS” stands for Secondary Security Screening Selection. “Secure Flight is a risk-based passenger pre-screening program. It enhances security by identifying low and high-risk passengers before they arrive at the airport. This is done by matching their names against trusted traveler lists and watchlists,” explained a TSA spokesman.
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