What PSS means
A PSS bundles several functions that used to be separate systems. The reservation module (the airline's CRS) stores bookings. The inventory module holds schedules, availability by booking class, codeshare flights and seat allocation. Ticketing issues e-tickets and EMDs and handles changes and refunds. The departure control system (DCS) covers check-in, boarding and flight close-out.
Most airlines do not build their own PSS. They rent a hosted system from a specialist vendor. Amadeus markets Altéa to full-service carriers and lists more than 130 Altéa customers (as of 2026). Navitaire, which Amadeus bought from Accenture for US$830 million in January 2016, describes its platform as the one that launched the low-cost carrier industry. Sabre's SabreSonic Customer Sales & Service is described by Sabre as an integrated software-as-a-service platform covering check-in, inventory, departure control and e-commerce.
A newer generation of order-based systems is designed for ONE Order, replacing separate booking and ticket records with a single customer order. Finnair became the launch customer for Amadeus Nevio, an offer-and-order platform, and created its first native order in May 2025.
For travel agencies, the PSS matters because it decides what content and servicing an airline can expose through NDC APIs and GDS connections.
How PSS works
Each flight passes through the PSS from schedule publication to departure, with every sales channel connected to the same inventory.
- Publish the scheduleNetwork planning loads flights into inventory, and revenue management sets how many seats are open in each booking class.
- Sell through channelsThe website, call centre, GDSs and NDC partners request availability and create bookings in the reservation module.
- Issue documentsTicketing issues e-tickets for flights and EMDs for extras such as bags or seats, and records exchanges and refunds.
- Control the departureThe DCS checks passengers in, assigns seats, tracks baggage and boarding, and closes the flight.
- Pass data downstreamFlown and sales data flow to revenue accounting, loyalty and analytics systems after departure.
PSS in practice
Vendor selection: in January 2015 Copa Airlines of Panama selected Sabre as its main technology provider, including the SabreSonic reservation system, according to a Sabre investor release.
Order-based PSS: on 5 May 2025 Finnair's chief executive booked a Helsinki to London Heathrow flight on Finnair.com, creating what the airline and Amadeus describe as the world's first native order, on the Amadeus Nevio platform.
Agency booking (illustrative): when an agent sells a seat in a GDS, the GDS checks the airline's PSS inventory, the PSS confirms the seat and creates its own booking, and later the airline's DCS uses that booking at check-in.
Who uses it
Advantages and limitations
Advantages
- One integrated system keeps reservations, inventory and check-in consistent for every channel.
- Hosted PSS platforms let airlines of any size use mature software without building their own.
- Modern PSS products add NDC and order capabilities that support richer, more personalised offers.
Limitations
- Migrating from one PSS to another is a large, risky project that touches every booking and airport process.
- Many PSS platforms still rely on PNR and ticket structures designed decades ago, which limits flexible retailing.
- Airlines depend heavily on a small number of vendors, so outages or price changes have a wide impact.
Frequently asked questions about PSS
Which companies provide airline passenger service systems?
The best-known suppliers include Amadeus, with its Altéa suite for full-service carriers and Navitaire, which is aimed at low-cost and growing airlines, and Sabre, with SabreSonic. Amadeus has also launched Nevio, an offer-and-order based platform. Several smaller regional vendors serve niche markets, and a few large airlines run in-house systems.
What does a departure control system do?
A departure control system manages the airport side of a flight. It checks passengers in, assigns or changes seats, prints or issues boarding passes, records bags, monitors boarding and produces the final passenger and load figures used to close the flight. It is usually a module of the airline's PSS or tightly linked to it.
Why is changing an airline PSS so difficult?
A PSS holds every future booking, ticket and seat assignment. Moving to a new one means converting live data, retraining staff, re-certifying connections with GDSs and partners, and switching airport processes, usually overnight. Any error can disrupt check-in and sales, so airlines plan these migrations for years.
What is an order-based PSS?
An order-based PSS stores a traveller's purchase as a single order rather than as separate PNR, e-ticket and EMD records. It follows IATA's ONE Order approach and is designed to support dynamic offers and bundles. Finnair, using Amadeus Nevio, created what it describes as the first native order in May 2025.
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