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under the name 'Apollo'. In 1987, Galileo was formed by nine European
carriers, which are British Airways, Aer Lingus, KLM, Alitalia, Swissair,
Austrian Airlines, Olympic Airways, Air Portugal and Sabena.

3- Worldspan:

Worldspan is a global distribution system, which is used by travel
agencies and travel related websites to book airline tickets, hotel rooms and
package tours. Worldspan hosts IT services and product solutions for major
airlines. It was formed in early 1990 by Delta Airlines, Northwest Airlines and
TWA to operate and sell its GDS services to travel agencies worldwide.

4- Amadeus:

Amadeus is one of the most preferred computer reservation systems
today. It processes the highest number of transactions in the travel and
tourism industry. In the last eighteen years, Amadeus has become the largest
global distribution system and the biggest travel content aggregator around
the world. It had maintained its position as the global leader in the travel

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