Contrails — the little white lines streaming out of an airplane — form when the hot air from the exhaust mixes with the cooler temperature and low-pressure environment.

Contrails are an instant visual reminder of air travel, and a source of much controversy in recent decades. Put aside the overblown conspiracies, though, and there are some genuine scientific ...

LYON—Thales and France-based carrier Amelia are scaling up their collaboration on preventing the formation of condensation trails, or contrails, as Amelia will apply prevention measures to every ...

Fewer aromatic hydrocarbons in the fuel means less soot in emissions. As soot particles act as condensation nuclei for ice crystals in contrails, less soot in aircraft exhaust gases means fewer ice ...