Which action was taken on the 9/11 system for aircraft?

• A. Expanded to include additional screening measures
• B. Integrated with other agencies' systems
• C. Nothing (no action taken)
• D. Replaced with a new system

Answer: (C)

After 9/11, aviation security moved from a mostly standalone approach to a layered, tightly coordinated system. The action taken on the 9/11 system for aircraft was to strengthen and connect security measures: screening of passengers and baggage was expanded and standardized across airports, and screening data was integrated with other agencies’ systems to share watchlists and threat information. This reflects a shift toward a more comprehensive, interagency approach rather than leaving things as they were or replacing the system overnight. In practice, these changes laid the groundwork for ongoing improvements under new security structures, such as TSA, rather than a single, immediate replacement.