Pass path: Master definitions of Global Distribution System GDS, Central Reservation System CRS, and Departure Control System DCS in Part 1. Top path: Diagram GDS Travel Distribution Ecosystem, contrast Central Reservation System CRS vs Global Distribution System GDS in Part 3, and solve the The Three Dominant World GDS Engines ladder in Part 4.
Part 1: Core Concepts (2 Marks)
- ★ Global Distribution System (GDS): A massive international computer network that acts as a central aggregator and switchboard connecting travel service providers (airlines, hotel chains, car rentals) with retail travel agencies globally.
- Central Reservation System (CRS): An airline-owned proprietary computerized database that manages its own flight inventory, schedule tables, seat availability, and fare classes.
- Departure Control System (DCS): The airport terminal software module that manages passenger check-in, seat assignment, boarding pass printing, baggage tracking, and aircraft weight and balance load sheets.
- Booking Fee (GDS Segment Fee): The transaction fee charged by the GDS company to participating airlines for every segment booked through an agency terminal.
- Sabre (Semi-Automated Business Research Environment): The historic pioneer computer reservation system developed jointly by American Airlines and IBM in 1960.
Part 2: Structural Frameworks (10 Marks)
GDS Travel Distribution Ecosystem
Architecture of Airline Electronic Distribution
AIRLINE ELECTRONIC DISTRIBUTION HIERARCHY
- AIRLINE HOST INVENTORY (CRS / PSS)
- Stores real-time seat inventory, fare classes (Y, B, M, Q), seat maps.
- v (EDIFACT / XML Transmission)
- GLOBAL DISTRIBUTION SYSTEMS (GDS Core Aggregators)
- Amadeus, Sabre, Travelport (Galileo).
- Consolidates schedules across 500+ world airlines into unified displays.
- v (Encrypted Cryptic Terminals & Web APIs)
- TRAVEL SUBSCRIBERS / INTERMEDIARIES
- B2B Travel Agencies (Thamel, New Road) & Online OTAs (Booking.com).
- Queries availability, locks seat PNRs, issues e-tickets via BSP.
Part 3: Distinction Tables
| Basis of Comparison | Central Reservation System (CRS) | Global Distribution System (GDS) | Departure Control System (DCS) |
|---|---|---|---|
| Primary Owner | A single airline enterprise. | Independent multi-airline consortium. | Airline airport station management. |
| Inventory Scope | Seats on that specific airline’s fleet. | Multi-airline flights, hotels, car rentals. | Flight manifests and checked luggage. |
| Operational Phase | Long-term booking (up to 330 days out). | Distribution and retail agency sales. | Flight departure day (T-24 hrs to gate). |
| Primary Users | Airline sales desks and pricing analysts. | Travel agents, OTAs, corporate desks. | Airport check-in agents, load masters. |
Part 4: Worked Problems & Exam Traps
★ The Three Dominant World GDS Engines
- Amadeus: Headquartered in Madrid, Spain (data center in Erding, Germany); market leader in Europe, Middle East, and Asia.
- Sabre: Headquartered in Southlake, Texas, USA; market leader in the Americas.
- Travelport: Incorporates Galileo, Worldspan, and Apollo; strong presence in the UK, South Asia, and Africa.
TU Exam Trap: On GDS questions, do NOT confuse a CRS with a GDS! A CRS belongs to one single airline (e.g., Singapore Airlines’ internal reservation system), whereas a GDS aggregates hundreds of airlines, hotels, and car rentals into a single screen.
Students lose marks here because they confuse a CRS with a GDS.