When a passenger who assigned to group five tries to board when group three is called, for example, their boarding pass will trigger an audible sound and display a message to gate agents.
Certain things like random selection, booking one-way tickets, purchasing boarding passes using cash, or traveling to a red-flag destination could be red flags, according to The Points Guy.
Deemed “the kiss of death” by jet-setters online, the “SSSS” stamp on a boarding pass is a sure-fire sign that a tripper’s flight plans could be severely delayed. “It stands for ...