A jet leaves contrails in its wake as it flies northward over Santa Cruz. The ice particles in contrails do not reach the ...

While it has yet to be confirmed what the sighting may be, it could be the shadow of a contrail, which is a vapor trail produced ... that form behind high flying aircraft." The NASA website ...

the outside air is cold and moist enough for the water vapor in jet exhaust to condense and freeze into ice crystals, leaving those cloudy white trails. Contrails aren't necessarily cloud-like ...