A corporate travel agent in Frankfurt searches flights to Chicago for a client, sees fares from a dozen airlines on one screen, books the best one and issues the ticket in a few minutes. None of those airlines built that screen.
It comes from a global distribution system, the wholesale network that most of the travel industry still runs on.
What is a Global Distribution System (GDS) in the travel sector?
A global distribution system (GDS) is a network that collects fares, schedules and availability from airlines and other travel suppliers and lets travel sellers search and book them in one place. Three companies run the GDSs that matter today: Amadeus, Sabre and Travelport.
On one side of a GDS sit the suppliers: airlines above all, and hotel chains and car rental companies too. On the other side sit the sellers: high-street travel agencies, travel management companies that book trips for corporate clients, and online travel agencies.
Why doesn't every agency simply connect to every airline? Because there are hundreds of airlines, each with its own systems, fare rules and booking formats. A GDS does that integration once, and an agency connects to one GDS instead of to every carrier.
Flights are where GDSs are strongest. Sabre, for example, narrowed its focus to air distribution when it sold its hotel technology unit in July 2025. Hotels are now sold mostly through other channels, which our guide to starting an online travel agency walks through.
Where GDSs came from: from SABRE to Amadeus
The first system began with a chance meeting. In 1953, IBM salesman R. Blair Smith was seated next to C. R. Smith, the president of American Airlines, on a cross-country flight. At the time, reservations were tracked by hand.
That conversation led American Airlines to commit roughly USD 40 million to a joint project with IBM. The result, SABRE, became operational in 1964, according to the Computer History Museum. By the mid-1960s it handled 7,500 reservations an hour and cut the time to process one from an average of 90 minutes to several seconds (IBM).
Airline systems like SABRE were later opened to travel agents, and European airlines answered with their own. In 1987, Air France, Iberia, Lufthansa and SAS founded Amadeus "with the shared vision of creating an independent and neutral global distribution system" (Amadeus).
The third of today's big three, Travelport, describes itself as connecting buyers and sellers of travel through "a single, independent marketplace". It is owned by a group of investors that includes Elliott Investment Management, after a recapitalization in December 2023.
How do Global Distribution Systems work?
A GDS sits in the middle of two flows. Fares, schedules and seat availability travel from the suppliers to the sellers. Bookings travel back.
Here is what happens when the agent in Frankfurt books that flight.
- Fares are filed. Airlines publish their fares and fare rules through ATPCO, an organization owned by airlines that has compiled fares since a 20-person tariff department was set up in 1945. Schedules and seat availability come from each airline's own reservation system.
- The agent searches. The GDS combines schedules, availability and fares from many airlines into one list of options with prices.
- The agent books. The GDS creates a booking record, usually called a passenger name record (PNR), and sends the reservation to the airline.
- The ticket is issued. The airline confirms the seat and the agency issues the ticket through the GDS.
- The money is settled. In most markets the payment between agency and airline runs through IATA's Billing and Settlement Plan (BSP), which, in IATA's words, "simplifies and standardizes your financial relationships with airlines".
For the traveler, all of this is invisible. For the agency, it means one connection, one booking format and one settlement process for hundreds of airlines.
GDS vs NDC: what is changing in airline distribution
Airlines have not always been happy with the arrangement. In a classic GDS connection, the airline sends fares in a fixed format and has little control over how its offer is shown, so extras such as seats, bags or bundles are hard to sell.
IATA's answer is NDC (New Distribution Capability), which it describes as "a data exchange format based on Offer and Order management processes for airlines to create and distribute relevant offers to the customer regardless of the distribution channel" (IATA). In plain terms, NDC lets an airline build its own offer and send it through any channel, including a GDS.
The airlines push the change with price. Since January 2026, Lufthansa Group charges EUR 18 to EUR 23 on each ticket booked through a classic GDS connection, EUR 8 through a GDS's NDC channel and nothing through its own NDC connection.
| Classic GDS | NDC through a GDS | Direct NDC connection | |
|---|---|---|---|
| Who builds the offer | The GDS, from filed fares | The airline | The airline |
| Extras and bundles | Limited | Full airline offer | Full airline offer |
| Connections to manage | One for many airlines | One for many airlines | One per airline |
| Lufthansa Group surcharge per ticket, 2026 | EUR 18 to EUR 23 | EUR 8 | None |
Does that mean the GDS is on its way out? Not yet. Amadeus reported that its air distribution bookings grew 2.8% in 2025, with revenue per booking up 5.0% at constant currency (Amadeus FY 2025 results). The GDSs are adding NDC content to their own platforms, so for most agencies the GDS becomes the place where both kinds of content meet.
Does your travel business need a GDS?
It depends on what you sell.
- An agency or travel management company selling flights to business travelers almost always works through a GDS, directly or through a consolidator.
- A hotel-only online travel agency usually doesn't: bedbanks, channel managers and the large OTAs' partner APIs are the faster route to rooms.
- A new flight seller can start with a flight API or a host agency and add a GDS once volumes justify the contract and the certification work.
Our online travel agency guide compares these sources, with what each costs and how long it takes to go live.
Software for the travel sector: where a GDS fits
A GDS connection is one supplier feed, and travel platforms rarely have just one. A typical booking or search platform combines a GDS, a few NDC connections, a bedbank or two and direct contracts, and has to turn all of them into one fast, consistent search.
That is where most of the engineering effort goes. Supplier APIs are slow and rate-limited, prices change by the minute, and a search that waits for every supplier loses the customer. The answer is usually a caching and pricing layer in front of the suppliers, which our guide to building a travel search engine explains step by step.
We have built that layer for a UK hotel metasearch engine. Moving availability search into an in-memory data grid let it serve 300 million queries a day at 80% lower infrastructure cost (case study).
If you are planning a booking platform, a metasearch engine or new supplier integrations, our travel software development team starts with a thirty-minute scoping call and a written ballpark estimate within a week.