What passenger service system (PSS) architectures, dynamic inventory availability caches, and New Distribution Capability (NDC) protocols define prime airline reservation platforms like Amadeus Altéa, SabreSonic, and Navitaire, and how do their core strengths—such as ultra-high-throughput transaction processing, complex fare ladder management, and global codeshare interoperability—ensure revenue maximization and operational reliability across volatile commercial flight schedules?