In August 2026, airlines began trial changes to transatlantic routes to reduce the formation of contrails—those very white streaks in the sky that, according to research, contribute significantly to global warming.
Contrails form when engine exhaust gases condense into ice crystals under certain conditions. These clouds trap heat in the atmosphere, and their impact on the climate is estimated by scientists to be comparable to the carbon dioxide emissions from aviation. Changing altitude or slightly deviating from a course allows aircraft to avoid zones where these trails persist longer.
Initial test results show that even minor adjustments—within 1–2 degrees of latitude or 300–600 meters in altitude—can reduce the formation of persistent trails by 50–70 percent on individual flights. At the same time, additional fuel consumption remains minimal because the deviations are small.
Project participants note that the key challenge is the precise forecasting of atmospheric conditions. Meteorological models are now integrating data on humidity and temperature at different flight levels so that pilots and air traffic controllers receive recommendations in real time. This requires close cooperation between airlines, meteorological services, and regulators.
For passengers, such changes are currently imperceptible: flight time increases by an average of a few minutes, and ticket prices do not rise. However, in the long term, such measures could become part of mandatory standards if their effectiveness is confirmed on a larger scale.
The experiment underscores that climate solutions in aviation do not always require radical technological breakthroughs—sometimes it is enough to rethink familiar routes.
