Final answer:
The FBI's Terrorist Screening Center (TSC) maintains the 'no-fly list' and the 'selectee list,' which are crucial for transportation security and involve individuals barred from flying or subject to extra screening.
Step-by-step explanation:
The agency responsible for maintaining the "no-fly list" and the "selectee list" is the Terrorist Screening Center (TSC), which is managed by the Federal Bureau of Investigation (FBI). The no-fly list is a list of individuals who are prohibited from boarding commercial aircraft flying into, within, or out of the United States. The selectee list includes individuals who are subjected to additional screening at airport checkpoints.
The No Fly List and the Selectee List are part of the larger Terrorist Watchlist maintained by the TSC, which includes individuals known or reasonably suspected to be involved in terrorist activities. Recognized by the Department of Homeland Security, the lists play a key role in ensuring the security of transportation and the safety of passengers. Decisions to include individuals on these lists are made based on threat assessments and intelligence reports.