Space-A Travel: How Military "Hops" Work
Updated July 2026
Space-Available ("Space-A") travel lets eligible members of the military community fly for free on U.S. military aircraft when there are open seats. It is a fantastic perk — but seats are never guaranteed, so it rewards flexibility and planning.
What Space-A is
When a DoD flight has unused seats after official passengers and cargo are loaded, eligible travelers can fill them at little or no cost. Flights are not scheduled like commercial travel, routes change, and you can be bumped — so never Space-A when you must arrive by a set date.
Who is eligible
Eligibility includes active-duty members (on leave), National Guard and Reserve members, retirees, their dependents (with rules on who can travel with or without a sponsor), and — thanks to a recent expansion — veterans with a permanent and total service-connected disability and certain surviving spouses. Your category and status determine your priority.
The six priority categories
Travelers are ranked in six categories, highest priority first:
- Cat I — emergency leave.
- Cat II — environmental/morale leave (EML).
- Cat III — ordinary leave, house-hunting, and dependents of deployed members.
- Cat IV — unaccompanied dependents on EML.
- Cat V — permissive TDY, students.
- Cat VI — retirees, Guard/Reserve, ROTC, and eligible disabled veterans.
Within a category, your sign-up date and time set your place in line.
How to sign up
Register with the passenger terminals you might fly from and to — you can sign up as early as 60 days out, by email, in person, or through the terminal's system. Signing up early gives you a better position on the list within your category. Check terminal Facebook pages and the AMC travel site for flight schedules ("72-hour" roll calls).
Tips for actually getting a seat
- Be flexible on dates, destinations, and departure terminals — sign up at several.
- Always have a paid backup plan and enough money to buy a commercial ticket if needed.
- Travel light, arrive early for roll call, and dress neatly.
- Bring your ID and, for dependents, the required sponsor documentation.
Frequently asked questions
Who can use Space-A military flights?
Active-duty members on leave, National Guard and Reserve members, retirees and their dependents, and — under a recent expansion — veterans with a permanent and total service-connected disability and some surviving spouses. Priority depends on your travel category.
Can Guard and Reserve members fly Space-A?
Yes. Guard and Reserve members are eligible for Space-A travel, generally in Category VI alongside retirees. On active-duty orders they may qualify in a higher category.
Is Space-A travel guaranteed?
No. Seats are only available after official passengers and cargo are loaded, schedules change, and you can be bumped. Never rely on Space-A when you must arrive by a specific date — always have a backup plan.
How early can you sign up for Space-A?
You can register at your departure and arrival passenger terminals up to 60 days before travel. Your sign-up date and time set your position within your category, so earlier is better.