Where an aircraft passes through a cloud, it can clear a path through it; this is known as a distrail (short for "dissipation trail").

A distrail forms when the heat of engine exhaust evaporates the liquid water droplets in a cloud, turning them back into invisible, gaseous water vapor.

D0840 Dissipation trail Distrail A clearly delineated limpid lane forming behind an aircraft flying in a thin cloud layer; the opposite of condensation trail.