Flight Bookings

Airline reservation systems includes Airline schedules, fare tariffs, ticket records and passenger Reservations. An 
Airline's direct distribution works within their own Reservation system, as well as giving out information to the 
GDS. The 2nd type of direct distribution channel are consumers who use the internet or mobile Applications to 
make their own reservations. Travel agencies and other Indirect Distribution Channels access the same GDS as 
those accessed by the Airline Reservation systems, and all messaging is transmitted by a standardized 
messaging System that Functions on two types of messaging that transmit on high level network. These 
messaging types are called Type A for real time interactive communication and Type B for informational and 
booking type of messages. Message constitute standards set by IATA and ICAO, are Global, and apply to more 
than Air Transportation. Since Airline reservation systems are Business Critical Applications, and they are 
functionally quite complex, the operation of an in-house Airline Reservation System is relatively expensive.
Before deregulation, Airlines owned their own reservation systems with Travel Agents subscribing to them. 

Today, the GDS are run by Independent Companies with Airlines and Travel Agencies being major subscribers.
From February 2009, there are only four major GDS providers in the Market: Amadeus, Travelport which 
Operates the Apollo, Worldspan and Galileo systems, Sabre and Shares. 
Reservation systems may host "Ticket-Less" Airlines and "Hybrid" Airlines that use e-ticketing in addition to 
Ticket-less to accommodate code-shares and Interlines.
In addition to these "standardized" GDS, some Airlines have proprietary versions which they use to run their 
Flight Operations. A few examples are Delta's OSS and Deltamatic systems and EDS SHARES. Reservations 
remains  the largest neutral multi-host airline reservations system, with over 100 Airlines currently managing inventory.

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