Name Description Vendor ACCELaero PSS, reservations, DCS, inventory and e-commerce platform. Information Systems Associates FZE AirCore Passenger services system (PSS) of modular, open-platform, web applications that replace core legacy systems.[1] Unisys Altéa Res Integrated airline reservation system and global distribution system (GDS). Amadeus IT Group Crane PAX Web-based airline reservations and ticketing system.