Sabre Global Distribution System, owned by Sabre Corporation, is a travel reservation system used by travel agents and companies to search, price, book, and ticket travel services provided by airlines, hotels, car rental companies, rail providers and tour operators. Originally developed by American Airlines with the assistance of IBM in 1960, the booking service became available for use by external travel agents in 1976 and became independent of the airline in March 2000. The system's parent company is organized into three business units: Sabre Travel Network: global distribution system Sabre Airline Solutions: airline technology Sabre Hospitality Solutions: hotel technology solutions