A recent news.com story underlined why it’s not nice to have SSSS stamped on your boarding pass in the USA. It means you’ve been lined up for Secondary Security Screening Selection and getting shuffled into ‘Secondary’ in the US is often not a pleasant procedure. At the very least it can be a real time-waster although when I shuffled through my travel notes I discovered I did get those four Ss on a boarding pass once.
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Avoid SSSS on Your Boarding Pass