Airline distribution explained: GDS, EDIFACT, NDC and Offers
Understand airline websites, travel sellers, GDS, EDIFACT, ATPCO, IATA NDC, Offers and Orders without assuming one universal architecture.
Who brings the airline offer to the traveller?
There is more than one way to buy a flight. A direct channel is usually operated by an airline. An indirect channel may be a travel agency, corporate travel management company or online travel agency. GDSs, aggregators and APIs connect sellers with airline content.
Airline website and app
The airline owns the customer interface and can assemble or distribute its products directly. The channel still relies on inventory, shopping, pricing, reservation, payment and fulfilment functions.
See the system journey →Travel sellers and GDS
A GDS offers connectivity and workflows that help travel sellers access airline content. It is a distribution role, not a synonym for the airline's reservation or inventory host.
Understand GDS versus PSS →NDC
IATA's New Distribution Capability is an XML-based data exchange standard grounded in Offer and Order management processes. It allows sellers and airline systems to interact across shopping, ordering and servicing.
Read IATA's NDC overview →EDIFACT
Electronic Data Interchange for Administration, Commerce and Transport supports established structured messages in traditional travel distribution. It is a message family, not a complete end-to-end platform.
Look up terminology →ATPCO
ATPCO publishes and distributes data such as fares, rules, baggage and retail product information used in airline distribution. In traditional shopping, sellers may construct offers using such data and airline availability.
Original ATPCO explainer →ONE Order
IATA ONE Order aims to simplify customer records and support integrated fulfilment, delivery and accounting. It is a different concern from merely changing a shop API.
Understand the records →How traditional distribution typically works
In many traditional shopping flows, the seller or a distribution system draws on published schedule data, fare and rule information, and airline availability data to assemble an itinerary and calculate or present a fare. A subsequent booking interaction creates or updates a reservation. Fulfilment and servicing may then involve multiple records.
This is a useful conceptual description, not an assertion that every airline or GDS uses precisely the same interfaces, caching rules or message sequence.
What NDC changes, and what it does not
NDC provides a standardised way for sellers to communicate with airlines using Offer and Order concepts. That can allow airlines greater influence over how their products are constructed and represented through indirect channels. It does not, by itself, replace inventory, airport control, payments, revenue accounting or every legacy host.
A seller's NDC integration may expose richer product attributes, ancillary choices and servicing operations than an older interface, but actual functionality depends on the airline, seller, NDC version and implementation. Standards describe a capability framework, not a promise of identical supplier behaviour.
A simple comparison: the same search, two architectures
A fictional traveller requests London to Madrid. In a traditional distribution pattern, a distribution platform may combine airline availability with published fares and rules. In an NDC pattern, a seller may send a shopping request to an airline or its authorised service and receive airline-generated Offers. Both paths still need availability, pricing, reservation, payment and fulfilment behind the scenes.
Where ATPCO fits
ATPCO explains that traditional distribution has drawn on fare, rule, schedule and availability data files and that richer offer creation increasingly involves airline-controlled APIs. Branded fares group product attributes so travellers can compare what is included. Do not conflate filed fare data with the total commercial Offer presented to a customer.
Why modern retailing is a larger programme than NDC
The transition to modern retailing touches commerce, Order management, servicing, fulfilment, settlement and operational integrations. IATA ONE Order describes a goal of consolidating records across delivery and accounting. A channel change may arrive long before all downstream systems are Order-native.
Knowledge check: does NDC replace the entire PSS?
No. NDC standardises Offer and Order distribution interactions. An airline may still rely on traditional inventory, ticketing, accounting and departure-control systems behind the interface.