Space-A travel
Space-available travel, also known as Space-A travel, is a means by which members of United States Uniformed Services (United States Military, reservists and retirees, United States Department of Defense civilian personnel under certain circumstances), and these groups' family members, are permitted to travel on aircraft of the Air Mobility Command under the jurisdiction of the United States Department of Defense when excess capability allows. == Background == Space available travel is a privilege that derives, in part, from United States Code, title 10, section 4744, which states, "officers and members of the Military Departments, and their families, when space is available, may be transported on vessels operated by any military transport agency of the Department of Defense".