How Far Out Can You Open a Group Flight File? Airline Windows vs Organiser Lead-Time

Airlines publish how far in advance a group file can be opened. Organisers need a different clock: when the date is real enough to start a quote. On Delta’s public group-travel page (retrieved 14 Sep 2026), U.S./Canada, Caribbean, Central America, and Asia-Pacific group bookings can be made up to 240 days before departure; Europe & North Africa, Southern & West Africa, and the Middle East up to 331 days. That is the open window. Easy Group Flights’ organiser guidance still frames a working pattern of roughly 2–6 months for many leisure and corporate groups of 10+, with peak summer, Christmas, and immovable event weekends needing earlier holds — a decision window, not a promise that inventory is unlimited that far out.

This is EGF Data Desk Study #1 (SKW-EGF-DATA-20260914-01). Method and sources below. No invented average savings percentages.

Key statistics (citable)

• A Delta group is 10 or more passengers traveling together on at least one common flight segment. (Delta Group Travel page, retrieved 2026-09-14)
• Delta public group bookings: up to 240 days before departure for U.S./Canada, Caribbean, Central America, and Asia-Pacific. (same source)
• Delta public group bookings: up to 331 days before departure for Europe & North Africa, Southern & West Africa, and the Middle East. (same source — ~11 months is a regional maximum, not a universal hold)
• American Airlines economy/mixed groups: 10+; all-premium: 7+. (AA Group & Meeting Travel T&Cs PDF, version marked 10/01/20)
• AA nonstop itineraries: at least 1 adult per 20 minors; connecting: 1 adult per 15 minors. (same T&Cs)
• Organiser working pattern: roughly 2–6 months for many leisure and corporate groups of 10+ — a decision window, not a fare promise. (EGF lead-time guide)

“Airline open windows (how far out inventory can be requested) are not the same as organiser decision windows (when a school, wedding, or company should start the quote).” — EGF Data Desk Study #1, 2026-09-14

Key finding

Open window ≠ decision window. Carrier pages answer “how early can the file start.” Vertical calendars answer “when should a school, wedding, or company start.” Mixing them produces bad advice and un-citable mush.

Method

Primary sources (retrieved 2026-09-14):

1. Delta — Group Travel
2. American Airlines — Group & Meeting Travel Additional Terms and Conditions (PDF)
3. Easy Group Flights — How Far in Advance to Book Group Flights

Table A — Delta public open windows (days before departure)

Also on the same Delta page: a group is 10 or more passengers traveling together on at least one common flight segment. Booking is secured with a booking fee and deposit as outlined in the group contract. If the group falls below the minimum of 10, the booking can be cancelled and the deposit forfeited (per the published general terms summary).

Source: Delta Group Travel page, retrieved 2026-09-14. Always re-check before citing as current policy.

Table B — American Airlines published group definition & supervision (T&Cs PDF)

Source: AA PDF T&Cs (file version marks include 10/01/20 and 10/17/19). Individual confirmations can differ. Retrieved/parsed 2026-09-14.

Table C — Organiser decision windows (EGF working pattern)

Not airline law. Practical start-the-quote triggers from EGF’s published guide:

Exact hold length is airline- and fare-specific and belongs on the quote — not in a blog promise.

Source: EGF Ghost article, 13 Sep 2026.

What “too late” looks like

From the same EGF guide, late usually means: only broken public inventory left; group split across multiple flights; name flexibility gone because individuals already ticketed; deposit schedule compressed; seats not together. Late can still be worth a specialist look — sometimes a messy construction beats a pile of leftover middle seats.

How to cite this study

Copy one line. Link this page. Prefer frozen wording from the EGF Data Desk cite book.

1. “Delta Air Lines defines a group as 10 or more passengers traveling together on at least one common flight segment.” — Delta Group Travel page, retrieved 2026-09-14 / EGF Data Desk Study #1
2. “On Delta’s public group-travel page (retrieved 2026-09-14), group bookings can be made up to 240 days before departure for U.S./Canada, Caribbean, Central America, and Asia-Pacific travel.” — EGF Data Desk Study #1
3. “On Delta’s public group-travel page (retrieved 2026-09-14), group bookings can be made up to 331 days before departure for Europe & North Africa, Southern & West Africa, and the Middle East.” — EGF Data Desk Study #1
4. “American Airlines’ Group & Meeting Travel terms treat economy/mixed-cabin groups as at least 10 passengers, or 7 when all are in premium cabins.” — AA T&Cs PDF / EGF Data Desk Study #1
5. “Under American Airlines’ published group T&Cs, nonstop itineraries require at least 1 adult per 20 minors; connecting itineraries require at least 1 adult per 15 minors.” — AA T&Cs PDF / EGF Data Desk Study #1
6. “EGF organiser guidance frames a working lead-time pattern of roughly 2–6 months for many leisure and corporate groups of 10+, with peak periods needing earlier holds (rule of thumb, not a fare promise).” — EGF / Study #1
7. “Airline open windows are not the same as organiser decision windows.” — EGF Data Desk Study #1 headline finding

FAQ

Is 240 or 331 days when I should book? No. That is often the earliest open on that public chart. Your decision window depends on vertical, peak, and how firm the date is.

Can we hold without names? Often yes at the start; final names still have a deadline on the file.

Do retail “book now” emails from airlines apply to groups? Those are usually individual retail campaigns. Group files have their own calendar.

Will you publish a savings % index? Only from real anonymized quote logs or a transparent fare method. Not from invented averages.

Next step? Get a group quote even if the roster is still moving.

Ready? Easy Group Flights is an IATA-accredited specialist desk for 10+ passengers. Get a group quote

Related: How far in advance to book group flights · How airline group fares work · When a group fare beats individual tickets · School trips · Wedding trips · Work retreats · Sports teams