Tag Archives: Contrails

AI-Driven Route Planning Reduces Climate-Warming Contrails on Over 100 Flights

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Impact of Contrails on Global Warming

Contrails Major Contributors to Air Travel’s Global Warming Impact

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A comprehensive study examining thousands of flights between the United States and Europe revealed that contrails—those vapor trails left by aircraft—are less likely to form when planes follow artificial intelligence (AI)-recommended flight paths aimed at minimizing their global warming impact.

Contrails, created from soot particles emitted by aircraft engines, are believed to contribute significantly to warming, potentially surpassing the effects of carbon dioxide alone. Recent research indicates that certain icy areas in the upper atmosphere are more prone to contrail formation, and AI technology can predict these zones using detailed weather forecasts.

Despite the promising results from small-scale trials where aircraft avoid these high-contrail areas, such practices have not yet been widely implemented in commercial aviation.

In the study, Dinesh Sanekom and colleagues from Google utilized an AI-controlled contrail prediction tool to advise on flight routes in a randomized controlled trial involving over 2,400 flights with American Airlines.

This trial included overnight flights from the U.S. to Europe and spanned approximately 17 weeks, from January to May 2025. These flights specifically targeted nighttime, as contrails have an intensified warming effect during these hours due to reduced sunlight that reflects back into space during the day.

Flight routes between certain city pairs were randomly divided into two groups. The first group had the option to select an AI-optimized route that would result in fewer contrails, while the second group received no alternative route suggestions.

Although dispatchers were offered the opportunity to choose contrail-minimizing routes within the first group, only 112 of the 1,232 flights opted for these alternatives, primarily due to operational considerations such as cost and safety, Sanecom noted.

Analysis using satellite imagery of the flight paths indicated that flights adhering to AI-suggested contrail-optimized routes experienced a remarkable 62% reduction in visible contrails. When considering all flights that could have chosen these optimized routes, the overall decrease in contrail formation reached 11.6% compared to the control group.

“This supports our hypothesis that there is a scalable approach to implementing contrail avoidance across numerous flights if we can integrate it effectively and safely into flight planning,” Sanecom asserts.

Researchers calculate the global warming impact of air travel was diminished by 13.7% for the entire group utilizing the suggested routes, while flights using the optimized routes saw a substantial 69.3% decrease. Notably, no significant variations in fuel consumption were recorded between the groups.

“This approach is currently the most effective with the tools available,” states Edward Griespeerdt from Imperial College London. “The observed 62% reduction in contrails is unlikely to have occurred by chance.”

However, due to the intricacies of flight planning, it’s uncertain how much the 11.6% reduction could be realized in actual commercial operations, he added. “Scaling this to achieve a 60% reduction in contrails on every flight isn’t straightforward, but even a 10% reduction could yield a meaningful impact.”

Article updated on March 20, 2026

This article has been revised to reflect more accurate information regarding flight path modifications.

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Source: www.newscientist.com

Google Adjusts Over 100 Flights to Reduce Climate-Warming Contrails

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Contrails and Global Warming

Most of the global warming effect from aviation is attributed to contrails.

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A recent study involving thousands of flights between the United States and Europe indicates that contrails—a factor in global warming—are significantly reduced when aircraft follow AI-recommended flight paths.

These condensation trails, formed by soot particles from aircraft engines, are suspected to contribute more to global warming than the carbon dioxide emissions from airplanes. Additionally, research indicates that specific icy regions in the upper atmosphere are more prone to contrail formation, and AI can effectively utilize detailed weather forecasts to identify these areas.

Initial small-scale trials demonstrate that rerouting planes can diminish contrail formation, yet this method has not been extensively implemented for commercial flights.

In a collaborative study, Dinesh Sanekom and his team at Google employed an AI-based contrail prediction tool to optimize flight routes during a randomized controlled trial involving over 2,400 American Airlines flights.

This examination spanned approximately 17 weeks from January to May 2025 and included eastbound flights from the U.S. to Europe at night, when contrails are known to exert a stronger warming influence. During daylight, contrails tend to reflect solar radiation, thus generating a cooling effect.

Each flight path between two cities was randomly allocated to one of two groups. The first group had access to an AI-optimized route in their flight planning software, allowing them to select paths with fewer contrails; in contrast, the second group received no such suggestions.

Though dispatchers in the first group had the choice of selecting contrail-optimized routes, logistical concerns led only 112 out of 1,232 flights to opt for alternate paths, according to Sanecom.

AI analysis using satellite imagery revealed that flights utilizing contrail-optimized routes suggested by air traffic controllers experienced a 62% decrease in visible contrail formation. When considering all flights with access to contrail-optimized routes, the overall contrail reduction compared to the control group was 11.6%.

“These findings validate our hypothesis that scalable routes can effectively mitigate contrail formation on numerous flights, provided we safely and accurately integrate this process into flight planning,” says Sanecom.

Researchers estimated that the overall global warming impact of flights was reduced by 13.7% for the group utilizing the suggested routes, and by as much as 69.3% for flights that implemented the optimized routing. Notably, there was no significant difference in fuel consumption between the two groups.

“This approach may represent the most effective solution available today,” states Edward Grisspeed from Imperial College London. “The observed 62% reduction in contrails identified by satellite is unlikely to be coincidental.”

However, due to the intricacies of flight planning, the extent of the 11.6% reduction may not entirely reflect real-world operations, as Grisspeed notes: “It’s challenging to extrapolate this to achieve a 60% reduction in contrails for every flight. Even a 10% reduction, though, would create a meaningful impact.”

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Source: www.newscientist.com

Google Reroutes Over 100 Flights to Reduce Climate-Warming Contrails: A Sustainable Aviation Initiative

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Impact of Contrails on Global Warming

Contrails are the primary contributor to the global warming impact of flights.

Credit: Tuck/imageBROKER/Shutterstock

A groundbreaking study involving thousands of flights between the United States and Europe reveals that contrails are less frequent when airplanes follow AI-recommended flight paths designed to minimize global warming impacts.

Research indicates that contrails, formed by soot particles from aircraft engines, may cause more warming than the carbon dioxide emitted by airplanes. Certain icy regions in the upper atmosphere are particularly conducive to contrail formation, and AI tools can leverage detailed weather forecasts to identify these areas.

While initial trials suggest rerouting aircraft can effectively reduce contrail formation, this practice has yet to be implemented on a large scale for commercial flights.

Researcher Dinesh Sanekom and his team utilized an AI contrail prediction tool in a randomized controlled trial, examining over 2,400 real-world American Airlines flights.

This study, which included an eastbound flight from the U.S. to Europe, was conducted over approximately 17 weeks from January to May 2025. The flights took place at night, a period when contrails are known to exert a more pronounced warming effect, contrasting with daytime flights that reflect sunlight and create a cooling effect.

Each flight route was randomly allocated to one of two experimental groups. In the first group, air traffic controllers could opt for an AI-optimized route with fewer contrails, while the second group received no alternative route suggestions.

Despite the availability of contrail-optimized routes in the first group, only 112 out of 1,232 flights actually chose a different route due to factors such as costs, safety, and operational constraints, as noted by Sanekom.

AI analysis of satellite images demonstrated that flights utilizing contrail-optimized routes suggested to air traffic controllers saw a remarkable 62% reduction in visible contrails. Overall, considering all flights with the option to select a contrail-optimized route, the effective reduction in contrail formation was 11.6% compared to the control group.

“This validates our hypothesis that this approach can be scaled to enhance contrail avoidance across many flights, provided we can safely and accurately integrate it into existing flight planning systems,” says Sanekom.

Estimates suggest that the overall impact of these flights on global warming was reduced by 13.7% for the entire group employing the proposed routes, with a staggering 69.3% reduction for those using the optimized routes. Fuel consumption showed no statistically significant differences between the groups.

“This methodology appears to be the most effective approach available today,” states Edward Grisspeed from Imperial College London. “The 62 percent reduction in contrails observed suggests this is not a random occurrence.”

However, the intricacies of flight planning make it challenging to predict how much the initial 11.6% reduction might improve in real-world scenarios. According to Grisspeed, “While we cannot simply scale this up to achieve a 60% reduction in contrails on every flight, even an overall reduction of 10% represents a significant environmental benefit.”

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Source: www.newscientist.com

Google Reroutes Hundreds of Flights to Reduce Climate-Warming Contrails

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Contrails and Global Warming Impact

The Major Role of Contrails in Air Travel’s Global Warming Impact

Credit: Tuck/imageBROKER/Shutterstock

A recent extensive study involving thousands of flights between the United States and Europe revealed that contrails form less frequently when aircraft follow AI-recommended flight paths aimed at minimizing their global warming impact.

Contrails, the condensation streaks produced by soot particles from aircraft engines, are believed to contribute significantly to global warming—potentially more than the carbon dioxide emissions from planes. Recent research indicates that specific icy regions of the upper atmosphere are more prone to contrail formation, and AI can effectively leverage detailed weather forecasts to predict these locations.

Preliminary trials have demonstrated that directing planes away from these contrail-prone areas effectively reduces their formation. However, this strategy has yet to be widely implemented in commercial aviation.

According to Dinesh Sanekom and his team at Google, an AI-based contrail prediction tool was employed to offer route guidance in a randomized controlled trial encompassing over 2,400 real-world American Airlines flights.

The trial featured a one-way eastbound route from the U.S. to Europe, conducted over approximately 17 weeks from January to May 2025. These flights were scheduled at night when contrails are known to have a more intensive warming effect, contrasting with daytime flights, which tend to reflect sunlight and create a cooling effect.

Each flight path between two cities was randomly divided into two groups. The first group had the choice of an AI-optimized route designed to produce fewer contrails, while the second group received no alternative routing suggestions.

In the first group, air traffic controllers had the opportunity to select a contrail-reducing route; however, only 112 out of 1,232 flights actually opted for this alternative due to cost, safety, and operational concerns, as mentioned by Sanekom.

Analysis of satellite imagery showed that flights opting for contrail-optimized routes experienced a remarkable 62% reduction in visible contrails. Overall, when considering all flights offered a contrail-optimized option, the reduction in contrail formation was approximately 11.6% compared to the control group.

“This validates our hypothesis that this is a scalable method for minimizing contrail formation across numerous flights if we find a way to safely and accurately incorporate it into the flight planning process,” states Sanekom.

The researchers project that the overall global warming impact from flights was diminished by 13.7% for the entire group using the recommended route, and by 69.3% for those employing the optimized route. Notably, there were no significant differences in fuel consumption between the groups.

“This approach could be the optimal solution, at least given our current resources,” says Edward Grisspeed from Imperial College London. “The 62% contrail reduction observed via satellite is unlikely to be coincidental.”

However, due to the complexities involved in flight planning, Grisspeed noted the real-world scalability of the 11.6% reduction remains uncertain. “It’s not guaranteed that we can achieve a 60% reduction in contrails for every flight, but even a 10% decrease would have a significant impact.”

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Source: www.newscientist.com