<P> A mirror image of the passenger name record (PNR) in the airline reservations system is maintained in the GDS system . If a passenger books an itinerary containing air segments of multiple airlines through a travel agency, the passenger name record in the GDS system would hold information on their entire itinerary, each airline they fly on would only have a portion of the itinerary that is relevant to them . This would contain flight segments on their own services and inbound and onward connecting flights (known as info segments) of other airlines in the itinerary . e.g. if a passenger books a journey from Amsterdam to London on KLM, London to New York on British Airways, New York to Frankfurt on Lufthansa through a travel agent and if the travel agent is connected to Amadeus GDS . The PNR in the Amadeus GDS would contain the full itinerary, the PNR in KLM would show the Amsterdam to London segment along with British Airways flight as an onward info segment . Likewise the PNR in the Lufthansa system would show the New York to Frankfurt segment with the British Airways flight as an arrival information segment . The PNR in British Airways system would show all three segments . One as a live segment and the other two as arrival and onward info segments . </P> <P> Some GDS systems (primarily Amadeus CRS and SABRE) also have a dual use capability for hosting multiple computer reservations system, in such situations functionally the computer reservations system and the GDS partition of the system behave as if they were separate systems . </P> <P> See List of global distribution systems . </P> <P> GDS in the travel industry originated from a traditional legacy business model that existed to inter-operate between airline vendors and travel agents . During the early days of computerized reservations systems flight ticket reservations were not possible without a GDS . As time progressed, many airline vendors (including budget and mainstream operators) have now adopted a strategy of' direct selling' to their wholesale and retail customers (passengers). They invested heavily in their own reservations and direct - distribution channels and partner systems . This helps to minimize direct dependency on GDS systems to meet sales and revenue targets and allows for a more dynamic response to market needs . These technology advancements in this space facilitate an easier way to cross-sell to partner airlines and via travel agents, eliminating the dependency on a dedicated global GDS federating between systems . Also, multiple price comparison websites eliminate the need of dedicated GDS for point - in - time prices and inventory for both travel agents and end - customers . Hence some experts argue that these changes in business models may lead to complete phasing out of GDS in the Airline space by the year 2020 . </P>

What is the difference between crs and gds