Exhaust contrails usually form at high altitudes; usually above 8,000 m (26,000 ft), where the air temperature is below −36.5 °C (−34 °F). They can also form closer to the ground when the air is cold …

What are Contrails? Contrails, short for condensation trails, are line-shaped clouds produced by an airplane’s hot engine exhaust interacting with cold humid air several miles above t.

Mar 9, 2026 · A contrail is a thin white cloud that forms behind an aircraft when hot, humid exhaust from its engines mixes with extremely cold air at high altitude. The process is essentially the same thing …

Sep 2, 2024 · What are contrails? Contrails, short for condensation trails, form when the hot, moist exhaust from an airplane’s engine meets the cold, low-pressure atmosphere at high altitudes.

Jul 22, 2025 · Jet aircraft form contrails under these atmospheric conditions for the same reason that you can see the exhaust from your vehicle or your own breath on a cold day. Contrails are a normal …

What Is Known (and Not Known) About Contrails A condensation trail, or “contrail,” is a streamer of cloud sometimes observed behind an airplane. Learn more about where contrails come from.

3 days ago · Contrails form even when airplanes produce less soot Preventing contrails could help cool the planet, but the aviation industry will have to keep innovating

Aug 27, 2023 · Condensation trails, or contrails, are long, thin clouds that can form behind airplanes at cruising altitude. They are created by jet engines.

Contrails are a type of ice cloud, formed by aircraft as water vapor condenses around small dust particles, which provide the vapor with suficient energy to freeze.

Nov 11, 2025 · Contrails start as exhaust-driven ice crystals at cruising altitudes around 5 to 7 miles (8 to 12 kilometers). In dry air, they fade quickly. In cold, humid air, they can spread and morph into …