Depending upon time of day either it's either reflecting radiation back into space, or reflecting it back into the earth
Include urban sprawl, agricultural practices, and other deforestation activities in general which amplify the effect of absorbing and re-absorbing reflected radiation.
Although not used for detecting contrail conditions, there may be elements in this research which could prove to be useful.
https://ral.ucar.edu/solutions/produ...nt-areas-alpha