Aircraft contrails over houses. Contrails are artificial clouds formed from frozen water droplets from the exhaust of the engines of an aircraft. They form when aircraft are flying at altitudes exceeding 5000 metres and when the upper atmosphere is nearly saturated with moisture. In dry air the contrail quickly dissipates. There is increasing concern about the environmental effects of contrails as they can expand to form large clouds which reflect heat back to the Earth.
Model release not required. Property release not required.