Most travelers barely look at the collection of letters, numbers, barcodes, and abbreviations printed on a boarding pass. They check the flight number, departure time, gate, and seat assignment, then head toward security. But occasionally, four identical letters appear that can make the airport experience noticeably different: SSSS.
SSSS stands for Secondary Security Screening Selection. When this designation appears on a boarding pass for travel involving U.S. aviation security procedures, it generally means the passenger has been selected for additional security screening beyond the standard checkpoint process.
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