“SSSS” on a boarding pass stands for Secondary Security Screening Selection.

 Why it happens

Common triggers include:

• Random selection (very common)
• First-time flyer or unusual booking patterns
• One-way or last-minute tickets
• International travel, especially to/from certain regions
• Name similarities with someone on a watchlist

 Important tips for her

• Stay calm and cooperative—this is routine for staff
• Don’t joke about security (even casually)
• Keep documents easily accessible
• Follow instructions exactly

 Good news

• Once she clears it, she’s good to go for the flight
• It does not follow her permanently—she won’t necessarily get SSSS again
• Millions of travelers get this at some point