What does a “no-fly” list mean?

The concept of a "no-fly" list refers specifically to a database that includes individuals who are prohibited from boarding commercial aircraft due to security concerns. This list is maintained by government agencies to enhance aviation security and protect travelers from potential threats. Individuals placed on this list may be involved in activities that are deemed a risk to national security or public safety, such as terrorism or violent extremism.

This list serves as a protective measure, allowing law enforcement and airline personnel to prevent identified individuals from flying. The intent is to mitigate risks by monitoring and restricting access to air travel for those with a known history of questionable behavior.

The other choices inaccurately describe the functions or purposes of different types of lists related to air travel, and they do not fulfill the specific definition and function of a "no-fly" list.