The phrase E ticket (or E ticket ride) refers to an unusually interesting, thrilling or expensive experience. It derives from the admission ticket system used at Disneyland and Magic Kingdom theme parks before 1982, in which the E ticket (officially termed “E coupon”) admitted the bearer to the newest, most advanced, and/or most popular rides and attractions.
Reference : http://en.wikipedia.org/wiki/E_ticket
->CRS : the Computerized Reservation Systems
A computer reservations system (or central reservation system) (CRS) is a computerized system used to store and retrieve information and conduct transactions related to air travel. Originally designed and operated by airlines, CRSes were later extended for the use of travel agencies
Major CRS operations that book and sell tickets for multiple airlines are known as global distribution systems (GDS). Airlines have divested most of their direct holdings to dedicated GDS companies, who make their systems accessible to consumers through Internet gateways. Modern GDSes typically allow users to book hotel rooms and rental cars as well as airline tickets. They also provide access to railway reservations in some markets although these are not always integrated with the main system.
->GDS : The Global Distribution Systems
A worldwide computerized reservation network used as a single point of access for reserving airline seats, hotel rooms, rental cars, and other travel related items by travel agents, online reservation sites, and large corporations.
The premier global distribution systems are Amadeus, Galileo, Sabre, and Worldspan. They are owned and operated as joint ventures by major airlines, car rental comopanies, and hotel groups. Also called automated reservation system (ARS) or computerized reservation system (CRS).
e-Tourism is the use of new technologies for activities such as on line booking, portals of touristic destination that contain information valuable for travelers.
UNCTAD has developed the e-Tourism Initiative, with the aim of helping developing countries to make the most of their tourism potential. The idea, based on public/private sector collaboration, is to give developing destinations the technical means for marketing and selling their own tourism services online.