My son’s fiancée is coming for a visit today. She called my son from the airport and said she got stopped at security because she got SSSS. We have no idea what that means, and we’re nervous because it’s her first flight. What does it mean?

These four letters will have frequent flyers yelling four-letter words.

Deemed “the kiss of death” by jet-setters online, the “SSSS” stamp on a boarding pass is a sure-fire sign that a tripper’s flight plans could be severely delayed.

“It stands for ‘secondary security screening selection,’” Zach Griff, a senior aviation writer for virtual travel hub The Point Guys, based in New York,. “It’s a measure implemented by security authorities in the US to screen certain passengers with additional checks.”

And while most sightseers would agree that skyway safety is key, many hate the hassle of being held up by TSA.