When a couple spotted a four-letter stamp on their boarding pass , they were curious about what it might signify. Jordyn Verzera was left puzzled after discovering the letters 'SSSS' on her ticket. While you might have presumed the S represents 'special' and indicates preferential treatment, you'd be mistaken. SSSS stands for Secondary Security Screening Selection. It is a code employed primarily in the United States by the Transportation Security Administration (TSA). The code usually results