What Does ‘SSSS’ on Your Boarding Pass Mean? (And How to Stay Calm When You See It)

What Does ‘SSSS’ on Your Boarding Pass Mean? (And How to Stay Calm When You See It)

You’re at the airport, everything is going smoothly, and then you glance at your boarding pass. Printed clearly—often in a corner you might have otherwise ignored—are four letters: SSSS.

At first, it might not mean anything. But for those who recognize it, those letters can trigger a wave of anxiety. So what exactly does “SSSS” mean, and should you be worried?