The document outlines the history and evolution of airline reservation systems, detailing the shift from manual booking methods to automated systems like Sabre and PARS. It discusses key developments, such as the creation of the first computer reservation system by American Airlines in collaboration with IBM, the impact of the Airline Deregulation Act of 1978, and the rise of Global Distribution Systems (GDS) in response to competition. Furthermore, the document highlights the regulatory challenges and antitrust actions faced by airlines regarding their reservation systems and the eventual adaptation to online booking methods through the internet.