What airline travelers need to know if letters ‘SSSS’ appear on your boarding pass [Video]

Should you panic when you see “SSSS” printed on your boarding pass? Social media users are going viral for sharing their experiences after noticing the four letters upon arriving at the airport.

So, what does SSSS mean if it appears when you check in?

“SSSS are indeed four dreaded letters that no traveler should want to see on their boarding pass,” Zach Griff, senior aviation writer for the New York-based travel blog The Point Guys, told Fox News Digital.

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“It stands for ‘secondary security screening selection,’ and it’s a measure implemented by security authorities in the U.S. to screen certain passengers with additional checks.”

The Transportation Security Administration (TSA) will select passengers before the official flight departure.

“Selectees for this enhanced security are chosen in the days leading up to a flight when airlines share the manifest with U.S. security authorities,” Griff added.

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