Amadeus
1987
Iberia, Air France, SAS and Lufthansa,
Strongly based in Europe, Mid East, North Africa & Asia Pacific
Galileo
1993
Galileo was Founded by a combination of 11 most significant North American and European airlines conducted by United Airlines. Currently owned
by Cendant Corporation
It has a strong web-presence in US and Western Europe.
Sabre
1976
Initially it was founded by American Airlines. Currently Sabre is a separate entity owned by AMR corporation
very strong Global presence in US and Asia Pacific
Worldspan
1990
Worldspan was founded by Delta, TWA, and North West Airlines. Further it was being sold to Transaction Processing Corporation.
Mainly in the US and Europe