Golam Shahrier
A GDS (global distribution system) is the network that connects travel sellers to airlines, hotels and car rental companies. It lets one travel agency or booking site search, book and ticket many suppliers through a single connection. The three major GDS companies are Amadeus, Sabre and Travelport. The GDS does not own the seats or rooms; the suppliers do. Businesses that want GDS content without signing with a GDS often use a travel API aggregator such as Tripgic, which reaches all three networks, plus NDC and 67 low-cost carriers, through one API.
This guide is for travel agencies, OTAs and travel-tech founders who need to understand the GDS before they choose how to sell travel. It explains how a booking moves through a GDS, the big three and their codes, how the GDS differs from a CRS, a PSS and NDC, what it costs, and how a business gets access without a direct contract. The facts come from Travelport, ARC, IATA, AltexSoft and the companies’ own histories, checked in September 2026.
What Is a GDS?
A GDS is a large computer network that sits between travel suppliers and travel sellers. Suppliers load their schedules, fares, availability and rules into it. Sellers search it, book through it, and issue tickets from it.
The key idea is one connection, many suppliers. Without a GDS, a travel agency would need a separate contract and technical connection with every airline, hotel chain and car company it sells. With one, it can compare hundreds of suppliers on one screen or through one API and book any of them the same way.
Three things a GDS does not do are worth knowing early:
- It does not own inventory. The seats belong to the airline and the rooms to the hotel. The GDS carries their offers and passes bookings back.
- It does not sell to travellers. It is a business-to-business network. Travellers meet it indirectly, through the agency or site they book with.
- It does not set prices. Airlines and hotels set fares and rates; the GDS displays and books them.
One note on the name: “GDS” also means other things outside travel, such as a BPO or healthcare term. This guide is only about the travel distribution network.
A Short History: From Airline Systems to Global Networks
The GDS grew out of airline reservation systems built in the 1960s, when airlines needed computers to keep track of seats.
| Year | What happened |
|---|---|
| 1960 | American Airlines develops Sabre with IBM |
| 1976 | Sabre becomes available to external travel agents |
| 1987 | Air France, Iberia, Lufthansa and Scandinavian Airlines found Amadeus |
| 2000 | Sabre becomes independent of American Airlines |
| 2006 | Cendant sells Galileo and Orbitz to The Blackstone Group, forming Travelport |
| 2007 | Travelport acquires Worldspan |
The pattern is consolidation. Many airline-owned systems existed once; mergers left three global companies. That history explains two things you still see today. First, the old system names — Galileo, Apollo, Worldspan — survive inside Travelport. Second, the GDS was designed around airline seats, which is why it handles full-service airline content best and newer retail content less well.
How a GDS Booking Works, Step by Step
A GDS booking follows the same path every time, whichever GDS it uses.
- Suppliers load content. Airlines publish schedules and fares. According to AltexSoft, airlines working with ATPCO, the body that distributes fare data, can update US and Canada fares four times a day.
- The seller searches. An agent or booking site asks for a route and dates. The GDS returns matching flights, fares and availability.
- The seller prices the choice. The GDS confirms the fare and its rules for the chosen flights.
- The GDS creates a PNR. The passenger name record holds the traveller, the flights and the contact details. The GDS sends the request to the airline.
- The airline confirms. It answers HK (“holding confirmed”) or UN (“unable”), and the seat is held.
- The seller issues the ticket. After payment, the ticket is issued before the airline’s ticketing deadline. Only then is the seat really sold.
- The booking is serviced. Changes, refunds and schedule changes flow back through the same PNR.
The PNR is what makes a GDS powerful for complex trips. One record can hold flights on several airlines, a hotel and a car, and each supplier sees its own part. For the full picture of what happens around those steps, see our guide to the flight booking system.
The Big Three GDS Companies
Today the market is shared by three GDS companies, often called the “big three.”
| GDS | Founded | Strongest in | Notes |
|---|---|---|---|
| Amadeus | 1987, by four European airlines | Europe and much of the world | Generally described as the largest |
| Sabre | 1960, by American Airlines with IBM | North America | Also runs the former Abacus system in Asia-Pacific |
| Travelport | 2006, from Galileo; added Worldspan in 2007 | Varies by brand and region | The smallest of the three by revenue; runs Galileo, Apollo and Worldspan |
Market share is often quoted online, but the figures change by year, region and what is counted — air bookings, all bookings or revenue — and most have no current public source. What is safe to say is the order most analysts use: Amadeus largest, then Sabre, then Travelport.
The practical difference between them is less about size and more about which airlines, regions and tools fit your business. A European leisure agency, a US corporate travel company and an Asian OTA may each choose a different one. Our Amadeus vs Sabre vs Travelport comparison goes feature by feature, and our guides to the Amadeus API, Sabre API and Travelport API cover how developers connect to each.
GDS Codes: 1A, 1S, 1G and the Rest
Every GDS has a two-character code. You see them in booking records, airline policies and industry documents, and they are the quickest way to tell which system a booking came from. Travelport’s own reference lists them.
| Code | System | Company today |
|---|---|---|
| 1A | Amadeus | Amadeus |
| 1S | Sabre | Sabre |
| 1B | Abacus | Sabre (Asia-Pacific) |
| 1G | Galileo | Travelport |
| 1V | Apollo | Travelport |
| 1P | Worldspan | Travelport |
| 1E | TravelSky | TravelSky (China) |
This table also answers a common question: “How many GDS systems are there?” There are three major GDS companies, but more system names and codes, because Travelport runs three systems and Sabre absorbed Abacus. That is why some sources say three, some four, and some list eight.
Note that 1E is TravelSky, China’s own distribution and airline hosting system, not Amadeus. The codes are easy to mix up, and it is worth checking them when you read an airline’s booking policy.
GDS vs CRS vs PSS vs OTA vs NDC
Five terms are often confused. They are different layers of the same industry.
| Term | What it is | Who runs it | Who uses it |
|---|---|---|---|
| PSS (passenger service system) | The airline’s own system for its seats, check-in and boarding | Each airline | The airline |
| CRS (central reservation system) | A supplier’s own reservation system, such as a hotel chain’s or airline’s | Each supplier | The supplier and its direct channels |
| GDS | A shared network connecting many suppliers to many sellers | Amadeus, Sabre, Travelport | Travel agencies, TMCs, OTAs |
| OTA (online travel agency) | A website or app selling travel to travellers | Companies such as online agencies | Travellers |
| NDC (New Distribution Capability) | An IATA standard for airlines to sell through their own modern APIs | IATA sets it; each airline runs its own | Agencies, OTAs, aggregators |
The easiest way to hold it: the PSS and CRS belong to one supplier, the GDS joins many suppliers to many sellers, the OTA sells to the traveller, and NDC is a newer, airline-direct way of doing part of the GDS’s job. Our guides on NDC vs GDS and what NDC is explain that last layer in detail.
Who Uses a GDS?
A GDS serves both sides of the market.
On the selling side:
- Travel agencies, from small leisure agencies to large networks.
- Travel management companies (TMCs), which run corporate travel and rely on the GDS for policy, negotiated fares and complex trips.
- Online travel agencies, which use GDS content for full-service airlines.
- Corporate booking tools, which let employees book within company rules.
On the supplying side:
- Airlines, which reach thousands of agencies at once.
- Hotels, which reach corporate bookers through the same screens agents use for flights. Sabre, for example, says its marketplace offers 2M lodging options, though that total includes content beyond classic GDS hotel connections.
- Car rental companies, rail and some tour operators.
Corporate travel is where the GDS remains strongest. A business trip often has several flights, a hotel, a car and strict rules, and the GDS’s single record handles that well. Leisure and budget travel is where newer channels have gained most ground.
GDS for Hotels: How Rooms Reach Travel Agents
Many searches for “what is GDS” come from hotels, and the hotel side works a little differently from airlines.
A hotel does not usually connect to a GDS by hand. Its rates and availability live in its own CRS or property system, and a connection — often through a channel manager or a hotel technology provider — publishes them to one or more GDS networks. Once there, every connected agency can search and book the hotel on the same screen it uses for flights.
| Step | What happens |
|---|---|
| 1. Load | The hotel’s system sends rooms, rates and rules to the GDS |
| 2. Display | Agents see the hotel next to flights and cars for the same trip |
| 3. Book | The agent books; the GDS passes the reservation back to the hotel |
| 4. Pay | The hotel usually pays the agency a commission after the stay |
The reason hotels bother is corporate travel. Business travellers are often booked by travel management companies working inside a GDS, sometimes at rates the hotel negotiated with a specific company. A hotel that is not in the GDS is simply not on those screens.
For a travel business selling hotels, the lesson is different: the GDS is one hotel source among several. Hotel wholesalers and bed banks often carry far more properties, frequently at net rates. That is why hotel APIs mix sources, and why our hotel API integration guide covers room mapping and deduplication.
Why Travel Businesses Still Use a GDS
The GDS has real strengths, which is why it has survived decades of predictions of its end.
| Strength | What it means in practice |
|---|---|
| Reach | One connection to most full-service airlines and many hotels |
| Complex trips | Multi-airline, multi-city itineraries in one record |
| Mature servicing | Established tools for changes, refunds and reissues |
| Settlement | Works with agency settlement systems such as IATA’s BSP and ARC |
| Negotiated fares | Corporate and private fares loaded for specific agencies |
The scale is still large. ARC reports that US travel agency air ticket sales reached a record $9.8 billion in August 2026 alone — the market the GDS was built to serve. For an agency selling full-service airlines and corporate travel, the GDS is usually part of the answer.
The Limits of a GDS
The GDS also has real limits, and they matter most to new and growing businesses.
- Slow to join. A direct GDS integration takes 6–12 months, with contracts and certification.
- Costly. Setup fees, per-segment fees and often monthly minimums. Our GDS API cost guide lists the lines.
- Thin low-cost carrier content. Many budget airlines sell mostly direct, so a GDS alone misses routes travellers want.
- Older formats. Much GDS connectivity is built on older standards and message formats that take time to learn.
- Airline surcharges. Some airlines, such as the Lufthansa Group, add a distribution charge to tickets booked through the GDS instead of their own channels.
None of these makes the GDS useless. They explain why many travel businesses no longer rely on it alone. To compare both sides in more depth, read our guide on travel API vs GDS.
The GDS in 2026: NDC and Direct Channels
The biggest change in airline distribution is NDC. Airlines want to sell bundles, branded fares and personalised offers, and the older GDS format cannot carry all of that. So they built their own APIs to the IATA NDC standard.
The shift is measurable. ARC reports that NDC transactions accounted for 21.5% of total ARC-settled transactions in August 2026, a 3% increase from the previous year.
Three things follow for a travel business:
- The GDS and NDC now coexist. The GDS companies carry NDC content too, and many agencies book both.
- Some fares live only in one place. An airline may keep its best offers for NDC, or add a surcharge to GDS bookings.
- Low-cost carriers sit outside both. They need their own connections.
So the modern question is not “GDS or not” but “which mix of GDS, NDC and low-cost content do my customers need, and how do I get it without managing each connection myself?”
How to Get GDS Access for Your Travel Business
There are four common routes. They differ in speed, control and what you need first.
| Route | What you need | Time | Best for |
|---|---|---|---|
| Direct GDS contract | A contract with Amadeus, Sabre or Travelport, and ticketing authority | 6–12 months per GDS | Large agencies and TMCs |
| IATA / ARC accreditation plus a GDS | Accreditation to issue tickets and settle with airlines | Months | Agencies that want to ticket under their own name |
| Consolidator or host agency | An agreement with an accredited partner that tickets for you | Weeks | Small agencies starting out |
| Travel API aggregator | One API contract; the provider connects to the GDS networks | Days to weeks | OTAs, travel apps and startups |
On accreditation: IATA says its Billing and Settlement Plan serves 59,000+ accredited travel agents, and its entry option, GoLite, needs no minimum financial guarantee to issue tickets. In the US, the equivalent route runs through ARC and IATAN.
Whichever route you take, ask two questions in writing: whose accreditation are my tickets issued under, and which content do I actually get — which GDS networks, which NDC airlines and which low-cost carriers. Our guide to what a travel API aggregator is explains the fourth route in more detail, and our guide to GDS for travel agents compares all four routes, what each one costs and who it suits.
Which GDS for Which Kind of Travel Business?
There is no single “best” GDS. The right one depends on who you sell to, where, and what. These are the questions that usually decide it:
| Your business | What usually matters most | What to check |
|---|---|---|
| Corporate travel agency or TMC in North America | Corporate fares, policy and servicing | Sabre says it holds 75% of North American managed business travel — compare it with the others on your clients’ routes |
| Leisure agency selling long-haul | Wide full-service airline content and fare depth | Which network has the best fares on your top routes, and NDC access for your main airlines |
| Agency inheriting an existing setup | Continuity of PCCs, scripts and staff training | The network your agents already use — often Galileo, Apollo or Worldspan for Travelport agencies |
| New OTA or travel app | Speed to market, low-cost carriers, a modern API | Whether a direct GDS is needed at all, or an aggregator covers the mix |
| Agency selling short-haul and regional trips | Low-cost carrier fares | Low-cost coverage on your routes — often outside the GDS |
| Business needing several networks | Best fare across sources | An aggregator that searches all three and merges results |
The last two rows are why many newer travel businesses never pick just one GDS. Their customers fly airlines that sit in different networks, and many low-cost carriers are not in the GDS at all. Searching several sources through one API, with duplicates removed, often beats committing to a single network.
Should You Use a GDS Directly or Through an Aggregator?
It depends on your size, your customers and your team.
Go direct if you are a large agency or TMC with high volume, a team that knows GDS formats, and customers who need what a GDS does best: corporate travel, negotiated fares, complex itineraries. The months of setup pay back over years.
Use an aggregator if you are launching an OTA, a travel app or a new product, need to sell quickly, or need low-cost carriers and NDC alongside GDS content. One API gives you the mix without three separate integrations, and you can still reach the same GDS inventory.
| Question | Go direct | Use an aggregator |
|---|---|---|
| How soon must you sell? | Next year is fine | This quarter |
| Do you need low-cost carriers? | You will add them separately | Included in the same API |
| Do you have GDS specialists? | Yes | No, or not yet |
| One GDS or several? | Usually one | All three through one connection |
Many businesses start with an aggregator and add a direct GDS contract later, once volume justifies it. If you are also moving off a closed self-service tool, see our Amadeus API shutdown migration guide.
How Tripgic Connects to the GDS
Tripgic is a travel API aggregator. We are a technical intermediary, not a travel agency: bookings are fulfilled by the airlines and suppliers, and we provide the connection, the normalized data and the developer experience.
For GDS content specifically, from our GDS partners page and API documentation:
- One REST API connects to all three major GDS networks — Amadeus, Sabre and Travelport — plus airline-direct NDC content and 67 low-cost carriers.
- 700+ airline and low-cost carrier connections, returned as one normalized JSON format.
- The same flight from several sources is shown once, so your customers see a clean list.
- Prices returned at validation and booking are final: the supplier net fare plus a flat Tripgic fee per passenger, never a percentage of the fare.
- The full flight flow in fifteen endpoints, from search and branded fares to booking, extras, ticketing and cancellation — and the same API carries hotels and 8 product families in all.
- No GDS contract or per-GDS certification on your side, and a free sandbox after a short call and KYC check.
A direct GDS integration takes 6–12 months. With one API, most teams move from sign-up to a working sandbox in days. If you are deciding how to reach the GDS this year, test it against the routes your customers actually fly.
