Seamless and efficient exchange of flight information within the aviation industry requires the development and use of consistent practices, rules and principles.

To facilitate this exchange of data and to standardize schedule/slot data handling procedures, the Standard Schedules Information (SSIM) is published annually.

The SSIM is the official set of standards, guiding the industry with recommended practices, messaging formats and data processing procedures that are to be used by all IATA member airlines and their business partners for the exchange of airline schedules, communication of airport coordination information and minimum connect time data.

Buy the SSIM Online

The SSIM is available in print or digital formats. Find out which format suits your needs best.

We recommend digital for its search and automatic updates. Additional benefits of the digital version of the SSIM include:

  • Automatic updates to the Aircraft Types (Appendix A), Passenger Terminals (Appendix D) and UTC (Appendix F). These updates are additionally identified in the Industry Notifications section
  • Implementation guides and schemas (.xsd files) for Schedule and Slot messages can be referenced and used outside of the application
  • The content of the Aircraft Types (Appendix A), Passenger Terminals (Appendix D) and UTC (Appendix F) sections can be exported to csv format and used outside of the application
  • Access to Watchlists of potential new aircrafts for Appendix A and new airport terminals for Appendix D

What’s inside the SSIM?

  • Chapter 2 – Information Required for Standard Schedules (Data Requirements, Data Representation, Data Elements and Data Element Identifiers)
  • Chapter 3 – Standard Print Layouts for Schedules Information (Data Elements Required, Code Sharing Flights, Plan Change, Examples)
  • Chapter 4 – Standard Schedules Message Procedure (Principles and Rules, Messaging Standards, Technical Message Specification)
  • Chapter 5 – Ad hoc Schedules Message Procedure (Principles and Rules, Message Standards, Technical Specification, Technical Message Specification)
  • Chapter 6 – Airport Coordination Procedures (Principles and Rules, Standard Procedures and Messages, Message Standards, Message Specifications)
  • Chapter 7 – Presentation and Transfer of a Schedule Data Set (Principles for the Transfer of Computerized Schedules, Computerized Schedules Constraints, Application)
  • Chapter 8 – Presentation, Application, and Transfer of Minimum Connecting Time (MCT) Data (Establishing MCTs, Practice for the Submission of MCTs, Application)
  • Appendix A IATA Aircraft Types (Aircraft Type Codes, Aircraft Group Codes, ICAO Codes)
  • Appendix B Meal Service Codes
  • Appendix C Service Types
  • Appendix D Passenger Terminal Indicators (Assignment Principles, List of Passenger Terminals)
  • Appendix F UTC-Local Time Comparisons and ISO Two letter Country Codes (ISO country code, time Zone, Standard variation to UTC, Daylight Saving Time information)
  • Appendix G Traffic Restriction Codes Table
  • Appendix H Explanatory Notes on SSIM Applications
  • Appendix I Region Codes (Region codes, IATA TC areas, ISO country codes)
  • Appendix J Information Codes for Use in the Airport Coordination Process (Additional information Codes, Coordinator Reason Codes)
  • Appendix K General Aviation Slot Clearance Request
  • Attachment 3 MCT Coordinator Contacts

Still not sure the SSIM is for you? Download the full table of contents

What’s new in the SSIM?

Every year, the SSIM is published to keep the industry up-to-date on the latest standardization in technique, format and conventions in airlines schedules data.

Effective as March 1st, 2021, the 31st SSIM significant changes include:

  1. Chapter 2 – Minimum Connect Time International/ Domestic Status Override DEI 220: Clarification and examples added on the usage of the data element
  2. Chapter 2 – Revised Secure Flight Indicator (DEI504) for generic usage: Description, Use and Application amended
  3. Chapter 8 – Addition of a Connection-Building Filter and an Airline Partners Record Type 3 [Effective 1 November 2022]: New MCT standard to prevent displaying connections with airlines that do not have ticketing and/or baggage agreements
  4. Appendix A – New and revised IATA Aircraft type codes
  5. Appendix D – New and revised Passenger Terminal entries
  6. Terminal Registration and Change Request form to be used for the submission of the Passenger Terminal amendments for inclusion in Appendix D is available in the eSSIM and on this page
  7. Watchlist for potential new aircrafts and airport terminals (eSSIM)

Who uses the SSIM?

Airlines, Airports, Airport coordinators and facilitators, Global Distribution Systems (GDS), Computer Reservation Systems (CRS), Data aggregators & system providers, Government agencies & authorities, Travel agents, Original Equipment Manufacturers (OEMs), Education institutions