Understanding Space-A Categories: Who Gets Priority?

How the Space-A Priority System Works

Space-A flights fill seats using a strict priority system based on six categories (Cat I through Cat VI). When a flight has available seats, the terminal fills them starting with Category I and working down. Within each category, passengers are ranked by their sign-up date and time — earliest sign-up goes first.

The Six Categories

Category I — Emergency Leave

Service members on emergency leave (verified by their command) receive the highest priority. This is rare and reserved for genuine emergencies — family deaths, serious illness, etc.

Category II — Environmental Morale Leave (EML)

Service members stationed at designated remote or hardship duty locations who are authorized EML travel. This category exists to support troops at isolated posts.

Category III — Ordinary Leave and Deployed Dependents

The largest active duty category. This includes service members on ordinary leave and command-sponsored dependents of members deployed 30+ days to a contingency area. Active duty members on leave with their dependents also fall here.

Category IV — Unaccompanied Dependents of Deployed Members

Dependents of members deployed to a contingency area who are traveling without the sponsor, when not qualifying for Cat III.

Category V — Students and Permissive TDY

Service members on permissive TDY (house-hunting, etc.) and students at DoD schools traveling to/from school on non-duty travel.

Category VI — Retirees and Their Dependents

Military retirees, their dependents (accompanied or unaccompanied), reservists not on active duty, and other eligible travelers. This is the lowest priority but also the largest group of Space-A travelers.

How Roll Call Works

When a flight is announced, the terminal conducts a roll call. All signed-up passengers in the area must be present (or have indicated availability). The terminal then seats passengers starting with Cat I. If no Cat I passengers exist, they move to Cat II, and so on. Within each category, the earliest sign-up date/time gets priority.

What This Means Practically

• Cat I-II passengers almost always get seats when they're present, but they're rare.
• Cat III is competitive — active duty leave travelers are common at busy terminals.
• Cat VI travelers need patience and flexibility. On popular routes (BWI to Ramstein in summer), Cat VI may wait days. On less busy routes, you might walk right on.
• Sign-up date matters enormously within your category. Signing up two weeks early versus the day before can be the difference between flying and watching the plane leave.

Tips for Lower-Priority Categories

• Sign up as early as allowed (up to 60 days at CONUS terminals).
• Travel during off-peak times — weekdays, non-holiday periods, and winter months.
• Choose less popular routes where higher-category competition is lower.
• Monitor Space-A Central to find flights with historically lower demand.

Bottom Line

The category system is straightforward: higher categories board first, and within each category, earlier sign-ups win. You can't change your category, but you can control when you sign up, where you fly from, and when you travel. Those three variables make all the difference.