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You’ll undergo additional screening at the checkpoint.

What Happens During SSSS Screening?

When you see “SSSS” on your boarding pass, here’s what to expect:

Extra Pat-Down or Swabbing

TSA agents will swab your hands, luggage, and sometimes clothing for explosive residue.

You may be patted down more thoroughly than usual.

Baggage Inspection

Your carry-on will be hand-checked—even if it went through the X-ray machine.

Agents may ask you to open compartments or remove electronics.