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XML Interface to SITA Hosts Systems
SITA airline customers often have to develop and deploy their own secure in-house apps using data from Reservations, Fares, DCS and Ticketing.

Horizon Web Services (HWS) is a component of the SITA Horizon Passenger Services System (PSS) and provides consistent and reliable access to SITA’s host systems via a standard Application Programming Interface (API) which is based on a set of structured messages. This API enables airline customers to deploy their own reliable, secure and robust applications such as internet booking engines, kiosks and customized reservation agent applications that adhere to industry standards.

HWS is platform independent and is based on the OpenTravel™ Alliance (OTA) XML standards.

What makes Web Services Unique
Web Services’ Interface

Provides the openness, flexibility, platform independence, security and performance needed to support the customer service and distribution strategies of our airline customers.

Industry Standard Message Formats
By supporting industry standard message formats and protocols, Web Services reduces application development time and maintenance costs.

Ease of Use
Customer applications are able to access data easily and securely from the host system using messages that support the specifications of the OTA.

Enables airlines to easily create and modify applications in response to market needs
Offers a single point of access to multiple SITA systems
Increases the speed of development and reduces maintenance costs
Minimal (or no) impact from system changes in a secure environment
Uses existing dedicated IP or Internet-based communications


HWS Services

The following Horizon Web Services are available:


Calculate Currency , Calendar Shop, City Pair Mileage, Excess Baggage, Airfare Display, Flight Shop, Interline Agreements, Mileage, Passenger Facility Charge, Airfare Price, Rate of Exchange, Calculate Currency, Airfare Routing, Airfare Rules, Airfare Tax Text, Airfare RepriceRefund, Airfare Ancillary, Airfare Availability

Departure Control Services

Airline Seat Map, Airline Check-In, Flight Status


Airline Availability, Flight Schedules, Flight Details, Airline Booking, Retrieve and Modify Airline Booking, Cancel PNR, Queues, Itinerary Receipt

Ticketing / EMD

Issue Ticket, Retrieve TKT, Refund TKT, Revalidate TKT, Void TKT, Issue EMD, Revalidate EMD, Void EMD


Native Screen Text, Sign In, Sign Out


How it Works

Who Uses HWS

Horizon Web Services is suited to those airline customers who wish to develop their own ‘in-house’ applications. Airlines may have their own development expertise or a third-party contractor to develop applications on their behalf.

How to Access Horizon Web Services

To access Horizon Web Services:

  • Contact your SITA Account Manager to sign up for Horizon Web Services
  • When contracts have been signed, the Implementation Team will provide you with access to the HWS Implementation Site on
  • You will need to download and fill in the Implementation Questionaire on the Implementation Site
  • You can then create a Key-Pair PKI Certificate with details provided to you by the Implementation Team
  • All the necessary HWS demos, documentation, WSDLs and XML schemas are available to you from the Implementation Site to enable you to develop your applications

Terms & Pricing

For terms and pricing, please refer to our contact us page.


About us

We are the world's leading specialist in air transport communications and IT solutions. 


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