What mode of transportation is authorized for cleared U.S. personnel to courier classified information?

The correct choice regarding the authorized mode of transportation for cleared U.S. personnel to courier classified information is scheduled U.S. commercial passenger aircraft. This option is appropriate because commercial aviation provides a regulated and secure means of transporting personnel and sensitive materials.

Using commercial flights allows for adherence to established security protocols, such as screening and tracking, which are crucial when handling classified information. Additionally, U.S. commercial airlines are subject to federal regulations that ensure the safety and security of passengers, making them a viable option for transporting cleared personnel tasked with handling classified documents.

While other modes of transport, such as military transport, may be suitable under certain conditions, commercial flights are often used because of their availability, routine schedules, and ability to accommodate a large number of passengers in a secure environment. Other options like private vehicles or specific trains may lack the necessary security measures and regulatory oversight that ensure the secure transport of classified materials.