# Flight: DEFRA - July 2024 Update

DEFRA has updated the emission factors for greenhouse gas conversion. You can access the updated methodology here: [2024 Greenhouse Gas Conversion Factors Methodology](https://assets.publishing.service.gov.uk/media/668408e6a59289f59b840597/2024-greenhouse-gas-conversion-factors-methodology.pdf).

Here is [Conversion factors 2024: full set (for advanced users)](https://assets.publishing.service.gov.uk/media/668408512a468a64f5dde5ea/ghg-conversion-factors-2024_full_set__for_advanced_users_.xlsx).

## What's New?

### Flight Classifications

For flights starting or finishing in the UK:

* **Domestic**: Both starts and finishes in the UK.
* **Short-haul**: Under 3700 km, when either origin or destination is in the UK.
* **Long-haul**: Above 3700 km, when either origin or destination is in the UK.
* **International**: When either origin or destination is in the UK.

### Updated Logic

All other aspects of the logic remain the same as in previous versions.

### Updated Factors

* New emission factors for averaged aircraft type were published.
* Aircraft-specific information on emission factors will be available in the future (2025).