Finding four letters on your boarding pass could open you up to extra security checks at airports.
A travel expert has taken to social media to explain the four letters that might spell trouble for you if you see them on your boarding pass. If they appear, you may be subject to longer waiting times and security measures at the airport - reports the Daily Record.
Travel expert Michelle posted a video to TikTok to explain the meaning behind the letters 'SSSS' on your boarding pass. She explained the four S's stand for "Secondary Security Screening Selection", meaning you are likely to face extra security measures before you take off.