Security screening for commercial flights has become more rigorous over time. Today, travelers need a boarding pass to access gates and undergo security screening controlled by the federal government. They must also be mindful of the contents of their carry-on bags.

The current security system was built in response to various attacks and attempted attacks. These incidents exposed vulnerabilities in air travel, such as bombs hidden in luggage and hijackers. As a result, security procedures have been added layer by layer.

Further details on the evolution of air travel security are available, including how specific events have shaped the screening procedures in place today.