Air travel can be stressful even before reaching the airport, with travelers juggling transportation, baggage rules, terminal navigation, and boarding times. Long security lines, gate changes, or delays add to the tension. Amid this, passengers may notice a puzzling four-letter code on their boarding pass: SSSS. The code stands for Secondary Security Screening Selection and indicates that a traveler has been flagged for additional screening. Part of the TSA’s Secure Flight program, it analyzes passenger data—name, date of birth, and gender—against watchlists and trusted traveler databases. Being marked with SSSS does not mean a person is suspected of wrongdoing; selections...
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