Space-A seats are provided according to certain criteria. (Official duty passengers have priority over Space-A travelers.) For leisure travel, Reservists are placed in category VI, which is a rather low priority. Passengers are categorized by priority of travel and are processed in priority order by their sign-in time (Julian date). Space-A travelers may sign up for travel 60-days in advance of the desired travel date.

If you want to know where you can travel, check out our Space-A Travel Locations List, complete with contact information Unused seats on DoD-owned or controlled aircraft are made available once all the space-required (duty) passengers and cargo have been accommodated. The seats are made available on a space-available basis. The system accommodates these passengers by letting them fill seats on Air Force air transport flights that would otherwise be left empty. Space Available Flight, more commonly referred to as Space-A travel or military hops, is a privilege afforded to military service members, their families, and service retirees.