• Updated on 29 Jan 2019
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Term Definition Source
Enhanced Distribution Refers to the messages and standard relating to Resolution 787. Commonly referred to as ‘NDC’ Resolution 787
Simplified Distribution Refers to the messages and standard relating to Resolution 797. Commonly referred to as ‘ONE Order’ Resolution 797


Term Definition Source
Airline An enterprise operating aircrafts for commercial purposes which (i) performs scheduled or non-scheduled air transport Services, or both, which are available to the public for carriage of passengers, mail and/or cargo and (ii) is certified for such purposes by the civil aviation authority of the state in which it is established AIDM Glossary
Travel Agency A private retailer or public Service individual that provides travel and tourism related Services to the public on behalf of suppliers such as activities, Airlines, car rentals, cruise lines, hotels, railways, travel insurance, and package tours AIDM Glossary
Aggregator An entity who distributes a Seller’s shopping request to multiple Airlines and aggregates subsequent responses AIDM Glossary
Airline Within the context of Enhanced and Simplified Distribution (ESD); the Airline's role will be to respond to requests for Offers and to manage Orders. This Order Management role extends to include processing payments, issuing accountable documents or Orders, and where it comes to Order servicing, they will also be responsible for handling this from re-shopping for an Offer, through to applying any changes to the Order, processing further payments or refunds, and modifying accountable documents. To make the necessary distinction between the different roles Airlines can play in interline transactions the Airline role can be further subdivided
The Offer Responsible Airline (ORA) The Offer Responsible Airline (ORA) is a role played by an Airline in an interline scenario whereby the Airline requests products from other Airlines (POA) to supplement its Offer back to the Seller
The Participating Offer Airline (POA) The Participating Offer Airline (POA) is an Airline that receives a request from an ORA to supply products to the Seller within the ORA’s Offer
Aggregator An Aggregator proxies requests for Offers from Sellers to Airlines (or ORAs) and consolidates the Airline responses and transmits them back to the Seller. The Aggregator cannot alter the Offers it receives from the Airlines but may, as a secondary role, pass Order Management messages between Seller and Airline
Seller An organisation that interacts within supply chain to deliver Offers and Orders to the Customer, such as a Travel Agent
Customer A person or organisation that is purchasing products or Services from the downstream parties
Delivery Provider (DP) The entity responsible for delivery of a good or Service
LCC Low-cost carrier


A proposal to sell a specific set of products or Services under specific conditions, for a certain price.


The individual instance of a specific flight or Service Definition as it has been offered to (and eventually Ordered and consumed by) a specific Customer in the context of a specific Offer and/or Order.

A Service has the following possible delivery status:

Business State Description
READY TO PROCEED OM is in a position to allow a DP to prepare the Service. Customer is entitled to receive the Service. This is typically a trigger for ORA to begin accounting process
READY TO DELIVER Provider is in a position to start delivery of the Service
IN PROGRESS The DP is in the process of delivering the Service. There is a universal concept that the “In progress” status may block any further financial transactions; e.g. refund
DELIVERED Service has been successfully delivered
FAILED TO DELIVER Service could not be delivered due to Airline´s or provider limitations
SUSPENDED Delivery of the Service is suspended as a result of an Airline decision. Can only revert back to the previous status. Exception is that Suspended may go to Removed. This status may be used in case of fraud detection
REMOVED Service was deleted
NOT CLAIMED The Service has not been claimed by the Passenger for reasons as a result of Passenger action or inaction. e.g. Passenger no-show, etc
EXPIRED Service is no longer available for delivery. Service purchased with an associated time limit for consumption and Service was never claimed. Service having been at least Confirmed is no longer available as the Customer did not claim the Service within a specific time period, as dictated by the Airline
UNABLE TO DELIVER It is not possible for the DP to deliver a Service. This could be for reasons of availability, legal or regulatory constraint

The following state transitions are possible during the lifecycle of a Service:



A uniquely identified record of the agreement of one party with another to receive products and Services under specified terms and conditions. Order supports the sale of a flexible range of Airline products and Services that are not necessarily Journey based (e.g. subscription Services).

A ‘PNR’, ‘super PNR’ and ‘ticket’ are all today’s versions of Airline implementations of aspects of an Order. An Order will contain one or more Order Items each with an identifier that is unique within an Airline’s Order Management system.

An Order may support non-homogeneity, i.e. each passenger in an Order may hold different sets of order items at different prices.


Please refer to the AIDM Glossary for a more detailed list of Terms and Recommended Practice 1008.