Air Transportation involves the activities related to the safe passage of passengers or goods through the air. It also includes command and control activities related to the safe movement of aircraft through all phases of flight for commercial and military operations. Note: The protection of air transportation from deliberate attack is included in the Transportation Security Sub-Function in the Homeland Security Line of Business.

Ground Transportation involves the activities related to ensuring the availability of transit and the safe passage of passengers and goods over land. Note: The protection of ground transportation from deliberate attack is included in the Transportation Security Sub-Function in the Homeland Security Line of Business.

Water Transportation involves the activities related to ensuring the availability of transit and the safe passage of passengers and goods over sea and water. Note: The protection of maritime transportation from deliberate attack is included in the Transportation Security Sub-Function in the Homeland Security Line of Business.

Space Operations involves the activities related to the safe launches/missions of passengers or goods into aerospace and includes commercial, scientific, and military operations.