Try changing out the engine of an airplane cruising at an altitude of 30,000 feet. Sabre Holdings is doing just that. As the world's largest global travel distribution system, Sabre supports connectivity to more than 400 airlines, 64,000 hotels and 32 car rental companies 113 countries. Through their firsthand experiences, we will explore the challenges encountered during a large scale SOA implementation, as well as the considerations to the business needs these legacy systems support.