How to Sign Up for Space-A Travel: The Complete Email Guide

What “Signing Up” for Space-A Actually Means

Unlike commercial travel, Space-A flights do not have a booking system, a reservation portal, or a ticketing agent. Instead, you place your name on a terminal's Space-A register by sending an email directly to the AMC passenger terminal. That email — and the date and time it is received — becomes your official signup record. When seats are available on a departing mission, the terminal calls roll based on your eligibility category and your signup date within that category. The earlier you signed up compared to others in the same category, the higher your seniority.

There is no fee to sign up, no app to download, and no account to create. It is a simple email process that has been in place for decades. The challenge is knowing exactly what to include, where to send it, and how the system works once your name is on the list.

What to Include in Your Space-A Signup Email

Every AMC terminal requires the same core information in your signup email. Missing or incorrect information can invalidate your signup or delay your processing. Include all of the following in every signup email you send:

• Full legal name of the sponsor (the eligible service member). Use the name exactly as it appears on your military ID.
• Rank (for active duty, Reserve, Guard) or status (Ret. for retirees, 100% DAV for disabled veterans).
• Eligibility category — Cat I through Cat VI. If you are unsure of your category, use the Space-A Central eligibility wizard before you send your email.
• Last four digits of the sponsor's SSN. Terminals use this to verify eligibility and prevent duplicate registrations. Never include the full SSN.
• Number of travelers, including yourself. List dependents separately if required by the terminal (most accept a simple total count).
• Desired destinations. You can list multiple destinations. Many travelers list three to five destinations in order of preference. Listing “ALL” is accepted at most terminals if you are flexible.
• Contact phone number or email address, so the terminal can reach you if there are questions about your signup.
• Travel dates (optional but helpful). Some terminals prefer to know the window during which you plan to travel.

A sample signup email subject line: Space-A Signup Request — SGT Smith, USA. Keep the body brief and factual. Terminals process many signups daily and do not need narrative context.

Where to Find Terminal Email Addresses

Terminal contact information — including signup email addresses — is available through several official and unofficial sources:

• AMC Travel Site (amc.af.mil): The official Air Mobility Command website maintains a passenger terminal directory with contact information for all AMC terminals worldwide. This is the authoritative source for email addresses.
• Space-A Central Terminal Directory (/terminals): Our terminal directory lists email addresses, phone numbers, DSN numbers, and Facebook pages for 40+ AMC terminals, updated as information changes.
• Terminal Facebook pages: Many terminals actively post their signup email addresses and current procedures on their official Facebook pages. These are also the best source for real-time flight availability and roll call announcements.
• Direct phone call: If you cannot find the current email address online, call the terminal directly. Terminal staff will provide the correct signup email.

Email addresses occasionally change when terminals update their systems. Always verify you have a current address before sending, especially if you saved an address from a previous trip more than six months ago.

Signing Up at Multiple Terminals Simultaneously

You are permitted — and encouraged — to sign up at multiple terminals at the same time. This dramatically increases your chances of catching a flight. The system allows this because each terminal maintains its own independent register. Signing up at Travis AFB, Dover AFB, and Scott AFB simultaneously is entirely legal and is standard practice among experienced Space-A travelers.

When you do get a flight from one terminal, your signups at other terminals remain active until they expire. If you want to cancel them (so terminals do not waste time calling a name that is no longer available), send a brief cancellation email to each terminal you signed up at.

There is no penalty for signing up at many terminals. The more terminals you register at, the wider your departure options. Pro tip: you can CC multiple terminals on a single signup email to register at all of them simultaneously.

Warning: Do NOT re-sign up at the same terminal — this resets your priority to the new date and you lose all accumulated seniority. Calling a terminal to confirm they received your signup does NOT reset your priority.

When You Can Sign Up — The Critical Distinction

Active duty members cannot sign up for Space-A until their leave has started. This is one of the most commonly misunderstood rules. Your signup date is the date your leave begins — you cannot register days or weeks before your leave start date. This applies to all active duty categories (Cat I, II, III).

For retirees, P&T disabled veterans, gray area retirees, drilling Guard/Reserve, and dependents, the rule is different: you can register up to 60 days before your desired travel date at most terminals. Some Naval Air Stations (e.g., NAS North Island, NAS Fort Worth) have a 45-day maximum instead of 60. This is why Cat VI travelers are encouraged to sign up as early as possible — every day of seniority matters at the lowest priority category.

Important: All signup dates and times are recorded in GMT/Zulu time worldwide, regardless of your local time zone. Keep this in mind when calculating your seniority.

The 60-Day Validity Window

Your signup is only valid for 60 days. After 60 days from the date and time the terminal received your email, your name is automatically removed from the register. You must send a new signup email to restart your 60-day window — and doing so resets your seniority date to the new signup time.

For active duty, your signup validity is limited to the duration of your approved leave — whichever is shorter (leave end date or 60 days). For Cat VI travelers, the 60-day clock starts from your signup date. If you have been on the register for 55 days with no flight and are now ready to travel, do not re-sign — ride out the remaining 5 days and show up in person rather than losing your seniority position.

How Seniority Works Within Your Category

When a terminal calls roll for available seats, boarding order follows two tiers: category first, then seniority within that category.

All Cat I (Emergency Leave) travelers board before any Cat II, III, IV, V, or VI travelers. Within Cat I, the traveler who signed up earliest boards first. The same rule applies within every category. A Cat VI traveler who signed up 45 days ago will board before a Cat VI traveler who signed up 3 days ago — but only after all higher-category travelers have been given the opportunity to board.

This is why signing up as early as possible matters, even if you are not certain of your exact travel dates. Every day you wait is a day of seniority you are giving up to other travelers in your category.

What to Do When You Arrive at the Terminal

Arriving at the terminal is not the end of the process — it is where things get real. Follow these steps when you show up:

• Arrive early. Roll call is typically announced 24 hours before a scheduled departure, and you must physically check in at the terminal to respond to roll call. Some travelers camp out at the terminal for days waiting for a seat. At minimum, arrive the evening before you hope to board.
• Bring your signup confirmation. Some terminals send a reply email confirming your signup. Print it and bring it. Even if they do not require it, having a record of your signup date and time protects your seniority if there is any dispute.
• Have all required documents ready. Your military ID, leave form (if applicable), dependent IDs, and any international documentation must be on hand at check-in. There are no exceptions for missing documents — you will be turned away.
• Monitor the flight schedule. Terminal departure boards, Facebook pages, and direct inquiries at the passenger service counter are your best sources for what is flying when. Ask the terminal staff about upcoming missions.
• Stay flexible. Space-A seats are never guaranteed. Flights are cancelled, delayed, and rerouted without notice. The traveler who gets seats is the one who is present, patient, and prepared.

Make Your Signup Easier with Space-A Central

Use the Space-A Central signup generator to create a properly formatted signup email for any terminal in seconds. Enter your information once, select your terminals, and generate ready-to-send emails with the correct format each terminal expects. Available on the Pro plan.