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Check your boarding pass: If the letters SSSS are on it, expect to spend extra time at security. Here's what triggers SSSS on a boarding pass.

If SSSS appears on your boarding pass, plan for an additional 15-45 minutes of TSA screening when you get to the airport. Here's why.

If SSSS appears on your boarding pass, plan for an additional 15-45 minutes of TSA screening when you get to the airport. Here's why.

If SSSS appears on your boarding pass, plan for an additional 15-45 minutes of TSA screening when you get to the airport. Here's why.

If SSSS appears on your boarding pass, plan for an additional 15-45 minutes of TSA screening when you get to the airport. Here's why.

If SSSS appears on your boarding pass, plan for an additional 15-45 minutes of TSA screening when you get to the airport. Here's why.

If you do find this quartet of letters on your boarding pass, allow 15–45 minutes of extra time to get through security at the airport. This story was updated to add a gallery.

SSSS can appear on a boarding pass whether the passenger is flying in the U.S. or internationally. It can be a stressful experience to be singled out for extra scrutiny; a recent survey conducted ...