Air travel can be stressful, with passengers managing schedules, documents, airport procedures, and security requirements. One detail that can cause confusion is the “SSSS” code that sometimes appears on a boarding pass, often followed by additional screening at the airport.

“SSSS” stands for Secondary Security Screening Selection and is used by the Transportation Security Administration (TSA) to indicate that a traveler has been selected for additional security checks. Screening can include a more detailed inspection of luggage and electronics, identity verification, or a pat-down. Selection may occur through the Secure Flight system and can sometimes be associated with factors such as travel patterns or information mismatches, while some selections may also be random.

Importantly, receiving an SSSS designation does not by itself mean a traveler is suspected of wrongdoing. It is a security measure, and the process can be made easier by arriving early, keeping documents organized, and cooperating with airport personnel. For passengers who encounter the code, understanding what it means can make an unexpected screening feel less confusing.