# Flight: ICAO v13 - July 2024 Update ICAO has updated the ICAO Carbon Emissions Calculator Methodology. You can access the updated methodology here: [ICAO Carbon Emissions Calculator Methodology: Version 13](https://applications.icao.int/icec/Methodology%20ICAO%20Carbon%20Emissions%20Calculator_v13_Final.pdf). ## What's New? ### Cabin class data Depending on user selection for the cabin class (economy, premium economy, business, or first), and where the selected class is available, a multiplicative cabin class factor calculates and applies to the fuel burn to adjust the CO2 (kg) per passenger. The cabin classes offered (economy, premium economy, business, and first) are based on a dataset provided by Ch-Aviation and determined by the available route pairs, which were approximated according to the Seat Guru database. In cases where a specific cabin class is unavailable, passenger emissions are estimated based on the available cabin classes. This estimation may result in emissions being lower or higher than the actual portion. Additionally, the average emissions for a given route may be influenced by the combination of seat configurations of airlines operating on that route. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs-integration.squake.earth/notable-changes/calculation-changes/icao-v13-july-2024.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.