With gate crowding becoming more common, American Airlines is implementing new technology to prevent unauthorized early boarding for travelers in later boarding groups.

American Airlines has rolled out boarding technology that alerts gate agents with an audible sound if a passenger tries to scan a ticket ahead of their assigned group.

The airline has installed new technology at more than 100 airports in the U.S. that will make an audible sound when someone tries to skip ahead in line, and board when it isn’t their turn, The Associated Press reported.

(WFLA)—American Airlines is expanding new software to more than 100 airports to improve the boarding process. With the holiday season starting next week, American Airlines has added new software to ensure customers benefit from boarding in their assigned groups.