Global Distribution System

A global distribution system (GDS) is a computer-based network that aggregates and distributes real-time travel inventory—flights, hotels, and car rentals—from vendors to travel agencies and online booking platforms.

What is a global distribution system?

A global distribution system (GDS) links reservation inventory under one computer-based network. The most common uses for GDSs is in the tourism industry, mainly for airlines, hospitality companies, and car rental companies. In this way, service providers, such as travel agencies and online travel agencies can all sell tickets for the same flight, hotel, or car rental.

Major GDS providers

Three main platforms dominate the global distribution system market:

Amadeus – Headquartered in Madrid, Amadeus is the largest GDS by transaction volume and serves travel providers across Europe, Asia, and the Americas.
Sabre – Based in the United States, Sabre powers many North American airlines and travel agencies with its reservation and operations technology.
Travelport (Galileo, Worldspan, Apollo) – Travelport operates multiple GDS brands and provides broad connectivity for travel agencies worldwide.

How does a global distribution system work?

Global distribution systems act as an intermediary between vendors, such as hotels and airlines, and service providers, such as online travel agencies. Here's how the process works:

Vendor connects inventory to GDS – Airlines, hotels, or car rental companies sign up and link their available inventory to a global distribution system.
GDS syncs real-time availability – The GDS continuously updates inventory across all connected portals to prevent overbooking.
Travel agent or OTA queries GDS – A travel agent or online travel agency searches the GDS for available options matching a customer's request.
Customer books – The customer selects and confirms their booking through the travel agent or OTA portal.
Transaction routes through vendor's CRS – The actual purchase processes through the vendor's own computer reservation system.

This setup allows vendors to automatically update products and rates, enabling dynamic pricing that immediately changes across all portals.

Key benefits of a GDS

Real-time inventory sync – Availability updates instantly across all connected platforms.
Dynamic pricing across all portals – Rate changes reflect immediately everywhere your inventory appears.
Reduced overbooking risk – Synchronized inventory prevents double-bookings.
Expanded distribution reach – Connect to thousands of travel agencies and OTAs through a single integration.

Who uses a global distribution system?

Different teams rely on GDS platforms for different reasons:

Corporate travel managers – Use GDS-connected tools to book and track employee travel while enforcing company policies.
Traditional travel agents – Query the GDS to compare options and book on behalf of clients.
Online travel agencies (OTAs) – Pull real-time inventory from GDS platforms to display on their booking websites.
Travel management companies – Leverage GDS data to manage travel programs and negotiate rates for their clients.

GDS vs. computer reservation system (CRS)

Feature

GDS

CRS

Operated by

Third-party network

Original vendor (airline, hotel)

Purpose

Aggregates and distributes inventory from multiple vendors

Manages a single vendor's own reservations

Who accesses it

Travel agents, OTAs, travel management companies

The vendor's internal systems and direct booking channels

Transaction processing

Routes bookings to the vendor's CRS

Processes the actual booking and payment

In short, a GDS displays the vendor's inventory to a wide network, while all actual purchases are processed through the vendor's own computer reservation system.

Does it cost to be part of a GDS?

Yes. Airlines and hospitality companies typically pay a per-segment booking fee each time a reservation is made through the GDS. These fees can range from a few dollars to over $10 per booking segment, depending on the GDS and the agreement.This cost structure often means customers get a better deal when purchasing directly from the vendor. It also leads many vendors to invest in their own booking portals to reduce GDS fees.However, many vendors see the expanded reach as more valuable than the cost. These vendors sign up with multiple GDSs to display their inventory across the maximum number of portals.