IATA Report Urges Collaborative Research on Aviation Contrails to Inform Climate Impact Mitigation Strategies

The International Air Transport Association (IATA) has released a report emphasizing the need for enhanced research into aviation-induced contrails and their climate effects. The report, titled “Aviation Contrails and their Climate Effect: Tackling Uncertainties and Enabling Solutions,” advocates for greater collaboration between the scientific community and industry to improve the understanding of non-CO2 emissions and to collect more atmospheric data.

Contrails, which are produced by aircraft engine exhaust under certain atmospheric conditions, have the potential to contribute to climate change by affecting the Earth’s radiation balance. The report notes the existing gaps in scientific knowledge concerning the formation, persistence, and climate impacts of contrails. It points to the scarcity of high-resolution, real-time atmospheric data as a significant challenge in developing accurate contrail predictions and understanding their overall effect on the climate.

IATA’s Director General, Willie Walsh, has made a statement underscoring the necessity of informed action supported by robust data and scientific analysis. Walsh’s comments reflect caution against premature regulatory measures that could potentially have unintended negative consequences on the climate due to a current lack of comprehensive understanding.

The report proposes a tiered strategy for addressing the issue:

  • Short-term objectives (2024-2030) include prioritizing CO2 emission reductions and increasing airline engagement in atmospheric data collection efforts.
  • Medium-term targets (2030-2040) suggest the creation of data transmission standards and the continuous improvement of climate and humidity models.
  • Long-term goals (2040-2050) aim for an established practice of continuous data provision by aircraft, leading to a precise understanding of the climate impacts of aviation, including the non-CO2 effects of alternative fuels.


Acknowledging the complexity of contrail science, the report references recent partnerships among meteorologists, climate scientists, airlines, and aircraft manufacturers that have resulted in new insights. These initiatives have included trials to assess the potential for flight path adjustments and the use of alternative fuels to mitigate contrail formation, though the results have been constrained by atmospheric variability and the localized nature of contrail generation.

Technological progress is critical, per the report, with a specific focus on the development of advanced humidity sensors for aircraft. The current technology, lacking in both sensitivity and timeliness, is deployed on a limited number of aircraft, which, according to the report’s authors, constrains the ability to validate and improve impact models and assessments.  

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