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Noun(1) (2) an artificial cloud created by an aircraft(3) caused either by condensation due to the reduction in air pressure above the wing surface or by water vapor in the engine exhaust

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(1) The jets attempted to intercept and identify the source of the contrail , but no visual or confirmed radar contact was made, he added.(2) If the aircraft was making a contrail , the pilot was to turn back.(3) Commercial airline pilots later reported the contrail over Florida and later over Indiana.(4) It's hard to make a smoke plume look more threatening than a far-off contrail .(5) We also saw lots of jet contrails in the blue sky above.(6) The reason, it turns out, is that American airspace was shut down, and no airplanes means no contrails .(7) They speculated that the nuclei of the ice ball could have been lingering jet contrails that then descended through a nearly saturated atmosphere.(8) Higher and farther to the west the contrails of the aircraft bent around the mountains and merged with the clouds, pointing north.(9) There were no vapor trails or contrails coming off the craft either.(10) I suggest it might be possible that fast moving jets generating energy and contrails in an electrically charged atmosphere may be able to form red plasma orbs that were imaged by Nicolas.(11) However, the fact that the volume of air traffic is set to rapidly grow in coming years makes it important to investigate the effects of contrails on our climate.(12) A couple years ago, I was fascinated to hear about the possibility that airplane contrails have an effect on the weather.(13) Sometimes, when we pass very close to or even fly through contrails left by another jet, we can see the twisting motion caused by the jet exhaust which created them.(14) Like other high, thin clouds, contrails reflect sunlight back into space and cool the planet.(15) The thick, twisting contrails still prevented any visual sightings.(16) The jet engine contrails have have caused most or all the warming observed in the United States for nearly 20 years.