A passenger service system is the core airline platform that handles bookings, check-in, baggage processing, seat assignment, boarding, and other passenger-facing travel functions. It is often the operational center of an airline, connecting customer apps, airport counters, gates, and back-office records so that one itinerary can be tracked consistently across the journey.
PSS platforms matter in cyber security because they are high-value, business-critical systems with many integrations and users. A failure, misconfiguration, or malicious change can disrupt reservations, create data mismatches, delay boarding, and force manual workarounds. In real incidents and defenses, PSS environments are closely tested during migrations, cutovers, and merger integrations, where teams use rehearsals, phased transitions, access controls, monitoring, and rollback plans to reduce the risk of outages or data integrity problems.