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.

Should you panic when you see "SSSS" printed on your boarding pass? Social media users are going viral for sharing their experiences after noticing the four letters upon arriving at the airport.

This restriction may happen when you have extra baggage to check in, for example. How to Remove a Boarding Pass From Your ...

Most airlines, and pretty much all legacy carriers (for example United, Delta, and American) have iPhone apps that allow you to check in and digitally retrieve your boarding pass on your phone.

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.

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 ...