FAQ - Frequently Asked Questions
Who is eligible to join?
Any airline is eligible to join SIS, whether or not they are a clearing house member.
Non-airlines may also join SIS provided that they do business with airlines. It is now possible for non-airlines to do business with other non-airlines through SIS.
How do I join SIS?
Access to SIS is granted once the Integrated Settlement Participation Agreement has been signed and the participant has passed the necessary certification process. This process is detailed in the Sign-Up Guide. These documents will be made available in the
Materials section of the website.
How do I know when my e-invoicing partners are migrating to SIS?
Airlines’ migration plans will be shared on a permission-basis. In the SIS Forums, there is a designated place where planned migration dates of airlines are stored. This information is released to the parties that are willing to share their own migration plans with us and their fellow carriers that have access to the list. For more information regarding this, please email us at
What are the charges of using SIS?
SIS is run on a cost-recovery basis. These charges will also be specified in the
Integrated Settlement Participation Agreement.
Signing Up & Migration Steps
What are the key submission options for SIS?
One of the many benefits of SIS is that interline partners will no longer depend on each other when it comes to choosing the formats to submit files. Under SIS, participants may select among various formats to submit files and this will not affect the way their billed entities receive the files.
The three submission options are IS-IDEC, IS-XML, and
IS WEB (manual input via web interface).
A matrix outlining the possible options to submit files/invoices can be found in the
Integrated Settlement Participation Guide (ISPG) Chapter 2.3.
What is the Sandbox?
The Sandbox is a dedicated separate environment primarily having the SIS validation components. The purpose of the Sandbox is to ensure that the outputs generated by your individual revenue accounting systems are as per the requirements of SIS.
In the Sandbox, you will be able to upload SIS format files (IS-IDEC and IS-XML) without any restriction on the number of files. SIS will validate your input file (IS-Validation) and will also check if the minimum certification requirements are met. Further details on the Sandbox are specified in the Sign-Up and Certification Guide.
How can I learn about using SIS?
Various training materials will be made available prior to go-live. These include:
Information on these materials will be described on the
Can formats of invoices be mixed? e.g. IS-XML for one Charge Code and IS-Web for another Charge Code?
How will the Call Day Adjustments (CDA) operate with SIS?
The ICH will generate CDA invoices as now and will create an IS-XML file (Charge Category: Service Provider / Charge Code: CDA) on the initialization of Clearance Period 2. Additional to today, the IS-XML file will also provide details of original invoices included in the CDA to simplify reconciliation of CDA amounts and enable allocation of any adjustment to the original invoices. As the invoice number format used by the ICH today exceeds the number of characters available in SIS, the number format will be changed to: "CD" + YY (invoice year) + MM (invoice month) + XXXX (incremental number), e.g. CD10080023 would identify the 23rd CDA invoice generated for August 2010.
What are the costs associated with using iiNet?
For the basic file transfer functionalities to/from SIS, no transaction fees will be applied.
The access to iiNet using a manual account will also be free of charge. Participants
wishing to set up a new automated file transfer account would be charged the current iiNet fees. Any optional iiNet functionalities beyond the basic file transfer, will be subject to iiNet current fees. For further information contact