What Is a GDS? Global Distribution System Explained

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A GDS system (global distribution system) is the network that connects travel agencies to airlines, hotels, and car rental companies. It lets one agency search and book many suppliers from a single screen. This guide explains what a GDS system is, how it works, the major GDS providers, and the modern alternatives travel businesses now use.

Key takeaways

  • A GDS system is a global network that links travel sellers to airline, hotel, and car suppliers so one agency can book them all in one place.
  • The three major GDS systems are Amadeus, Sabre, and Travelport. Amadeus is the largest by air bookings.
  • Older GDS brands — Galileo, Apollo, and Worldspan — still exist but are now part of Travelport.
  • A GDS gives wide reach, but it is costly and slow to join and weak on low-cost-carrier content.
  • Many new platforms now use a modern travel API or aggregator to get GDS-level reach without the heavy setup.

What Is a GDS System?

A GDS system is a large computer network. It links travel sellers to travel suppliers. Agencies use it to find fares, compare options, and book trips across many airlines and hotels at once.

The model dates back to the 1960s, when airlines built central reservation systems. These grew into the global networks agencies rely on today. You can read the background on the Wikipedia page on global distribution systems.

The Major GDS Systems (Amadeus, Sabre, Travelport)

People often ask how many GDS systems there are. Today the market is dominated by three major GDS companies — often called the “big three.” Historically there were more, but they merged over time.

GDS system Position Notes
Amadeus Largest by air bookings Based in Europe; widely seen as the market leader
Sabre Second major player Based in the US; strong North American airline base
Travelport Third major player Now includes the older Galileo, Apollo, and Worldspan brands

So when you see the names Galileo, Apollo, or Worldspan, these are older GDS systems that are now part of Travelport. That is why some people count “four GDS systems” — the three big companies plus the legacy Travelport brands. For a deeper feature-by-feature look, read our Amadeus vs Sabre vs Travelport comparison.

How a GDS System Works

  1. A supplier loads its fares and availability into the GDS.
  2. An agency searches the GDS for a trip.
  3. The GDS returns matching fares and rooms.
  4. The agency books through the GDS.
  5. The GDS sends the booking to the supplier.

This model has worked for decades. However, it was built for a different era. Therefore, it shows its age in some areas.

How a GDS system works: supplier loads fares, GDS network, agency searches, books, supplier confirms

Why Agencies Still Use a GDS System

The GDS still has clear strengths. So many large agencies still rely on it.

The scale is also still large. According to travel research firm Phocuswright, indirect distribution — the OTAs, TMCs, and GDSs that sit between travelers and suppliers — made up just over 45% of the U.S. travel market in 2019.

  • Wide reach across many airlines and hotels.
  • One screen to compare and book.
  • Trusted by large, established agencies.
  • Strong support for complex, multi-leg trips.

The Limits of a GDS System

A GDS system also has real limits. Specifically, it can be costly and slow to join.

  • High setup and per-segment fees.
  • Long certification before you can launch.
  • Thin content from low-cost carriers.
  • Older technology that is harder to build on.

As a result, many new platforms look for a modern path. To compare both sides, read our guide on travel API vs GDS.

GDS System vs Modern Travel API

A modern travel API is faster to join and easier to build on. It often uses clean, modern data formats. Moreover, it can blend GDS, NDC, and low-cost carrier content in one place.

Factor Traditional GDS system Modern travel API
Setup time Weeks to months + certification Days to weeks
Data format Older, complex Clean, modern (JSON/REST)
Content mix Mainly full-service airlines GDS + NDC + low-cost carriers
Cost model Setup + per-segment fees Often pay as you go

New standards also change the picture. For example, read our guide on what NDC is. It shows how airlines now send richer offers directly.

Old GDS system versus modern travel API comparison

Should You Use a GDS System or an Aggregator?

It depends on your size and goals. Large agencies may keep the GDS. However, new platforms often prefer one modern API.

An aggregator can give you GDS reach without the heavy setup. To learn how, read what a travel API aggregator is. It also helps if you are moving off a legacy system — see our Amadeus API shutdown migration guide.

GDS System FAQ

What does GDS stand for?

GDS stands for global distribution system. It is a network that connects travel sellers to airlines, hotels, and car rental companies.

What are the main GDS systems?

The three major GDS systems are Amadeus, Sabre, and Travelport. Older brands such as Galileo, Apollo, and Worldspan are now part of Travelport.

What is the most used GDS system?

Amadeus is generally the largest and most used GDS system by volume of air bookings, followed by Sabre and Travelport.

Is a GDS system still used today?

Yes. Many large agencies still rely on a GDS system. However, new platforms often prefer a modern travel API or aggregator instead.

GDS system or travel API: which is better?

It depends on your size and goals. A GDS system gives wide reach, while a modern API or aggregator is faster to join and easier to build on.

Final Thoughts

A GDS system still powers much of global travel. But it is costly and old in places. Therefore, many new platforms choose a modern API instead.

Tripgic gives you wide travel content through one modern API. You skip the heavy GDS setup. Talk to our team to see the easier path.

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