On Hold 14 March 2023

Sectoral Scope

7. Transport

Development ID#



Under Development

The proposed methodology involves employing advanced atmospheric modeling and analysis to forecast and reduce climate forcing caused by ice crystal hydrometeors in the clouds that aircraft make (called condensation trails or contrails). Project activities involve generating a baseline of contrail-generated surface warming from standard flight plans for comparison with contrail avoidance optimized flight plans generated by SATAVIA and flown by aircraft operators. The reduced climate forcing is converted into CO2-equivalent using the approach described by Teoh et al. (2020). The proposed methodology would require updates to the VCS Program rules.


The concept note was submitted by SATAVIA and is on hold, as per Section 3.2.5(2) of the VCS Methodology Development and Review Process, 4.3 (PDF). The concept note was put on hold due to limited scientific consensus and understanding of a suitable approach to convert non-CO2 effects (contrail management) into CO2 effects and endorsement by key stakeholders. Verra will consider resuming the development of this concept note after significant advances are made with respect to scientific consensus and key stakeholder endorsement.

Stakeholders interested in collaborating during methodology development or developing projects that this methodology might enable are encouraged to contact Please include the Methodology Development ID# CN0144 in the subject line.