Air travel is already known to come with its fair share of stress, from making sure luggage meets weight requirements to standing in long security screening lines. But for some passengers, the stress doesn't show up until they've checked in and are already at the gate, boarding pass in hand.

While a boarding pass is seen as something that ensures someone's spot on the plane, one small detail written on it can actually get a passenger kicked off.

U.S. Travelers Keep Getting Kicked Off Flights Because They Have This On Their Boarding Pass

Most people dread seeing the "SSSS" detail on their boarding pass , and for good reason. This code signals an extra TSA security screening, meaning it may take some travelers longer to pass through the security lane.

However, there's another boarding p

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