From the document: "After the January 6, 2021, security breach of the United States Capitol, some Members of Congress have advocated restricting the air travel of individuals who may seek to incite or carry out further violence. The Federal Bureau of Investigation (FBI)is reportedly considering placing individuals who illegally entered the Capitol on the Transportation Security Administration (TSA) No-Fly List. This In Focus discusses the circumstances under which air carriers, TSA, and other federal authorities may restrict domestic airline travel in response to security threats."
CRS In Focus, IF11731
Congressional Research Service: https://crsreports.congress.gov/