Airline reservation systems are used by airlines to manage their reservations. These airline reservation systems are interfaced with a worldwide network of distribution systems that are available to booking websites, travel agencies and other distributors in making of reservations for airlines. Airline reservation systems help airlines to market more effectively and efficiently, grow sales and manage their networks of distribution to customers. With the use of Airline reservation systems, airlines can have solid control of their reservations all in a unified system. This eases the process of distributing updates made on flights and other operational services. Airline reservation systems are a part of applications that facilitate the direct contact between airlines and passengers, which is known as Passenger Service Systems (PSS). There are many features that help Airline reservation systems achieve their aim of simplifying reservations. Some of these features include booking engine, airline inventory management, end user reservation, travel agents’ reservation, Global Distribution System (GDS) integration, mobile app support for airlines, airline hosting system, reservation management, e-ticketing and third party interface management.