should not automatically be interpreted as proof that the passenger is on a no-fly list.
A passenger who has been issued a boarding pass containing SSSS has been designated for additional screening. That is different from being prohibited from flying.
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There can be different reasons why additional screening occurs, and passengers generally are not given a detailed explanation of the internal criteria that produced a particular selection.
This distinction matters because online discussions sometimes portray SSSS as evidence that the government considers a traveler dangerous. That
