Top airline reservation systems are platforms that manage flight inventory, ticket bookings, passenger records, pricing, and distribution across airline sales channels, serving as the foundation of airline operations; systems like Amadeus Altéa, SabreSonic, Navitaire, Radixx, and Hitit Crane differ in scalability, distribution capabilities, revenue management, and cloud support, so you should choose the top system based on airline size, business model, and operational complexity.