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a- Maintenance of/and search facilities for flight schedules and availability.
b- Information about other travel and tourism products and their availability

such as package holidays, car hire, etc.
c- Reservation.
d- Ticketing.
e- Maintenance of user information, based on PNR. Each passenger has

a PNR, which is issued as a unique key element for identification.
f- Maintenance of and search facilities for fare quotes and rules.
g- Management functions for travel agents e.g. reporting and accounting

for airlines as well as decision support systems for yield management.

CRSs have re-engineered the entire marketing and distribution process
of airlines. They have become strategic business units in their own right
owing to their ability to generate income to boost airlines sales. The
premier global distribution systems are Amadeus, Sabre, Galileo, and
Worldspan. They are owned and operated by major airlines, travel
agencies, and hotel groups. They are also called 'automated/airline'
reservation system (ARS):

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