TUIfly-DLR Flight Data: This week, TUIfly passenger flights flew with a special partner in the sky. A Falcon 20E research aircraft from the German Aerospace Centre followed several flights so it could study how and where contrails form. This rare type of flight tracking has not happened in many years, and it gives scientists fresh, real-time information about how planes affect the environment. The work is part of the EU-funded A4Climate project, which tries to understand how to lower the climate impact of flying.
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Why Contrails are Important?
Contrails are the white lines you sometimes see behind airplanes. They form when planes travel through cold and wet air. These lines may look harmless, but they sometimes stay in the sky for a long time. When that happens, they can trap heat. Scientists say that contrails may cause about 1% to 2% of global warming. This number may look small, but it is still important because it adds to aviation’s climate impact.
The A4Climate project studies how new “lean-burn” engines that produce less soot can help reduce these long-lasting contrails. The Falcon research aircraft collects data from real passenger flights to see how the engines behave in the air. By doing this, researchers can figure out which engine designs and which flying methods help lower the creation of contrails.
TUIfly Support for Climate-Friendly Flying
TUIfly has taken a very active role in this work. The airline opened its flights to the research team so they can track contrails closely. Christoph Todt, Head of Environmental Sustainability at TUI Airline, said this project is an important move toward using climate-aware ideas in normal flight operations, reported TTW. The airline hopes that by sharing its flights and knowledge, the aviation industry will use these findings soon and shrink its part in global warming.
The airline has also been changing the way it flies. Since early 2025, TUIfly has been rerouting some flights to avoid areas where long-lasting contrails may form. These route changes help scientists check how contrails behave and help them build better climate models.
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A Big Team
The A4Climate project includes 17 partners from nine countries. The team has groups like the Max Planck Society, ETH Zurich, Imperial College London, Eurocontrol, and more. They all work together to find solutions that make flying more friendly for the Earth. The partners study engines, fuel choices, and different flight paths to find the best ways to cut climate harm.
Thanks to TUIfly and the Falcon research plane, scientists now collect real-time information about how contrails form. They measure what is inside the contrails and how they change in the sky. This information will help build cleaner engines, cleaner fuels, and smarter flying rules
