Con Trail

no, this is not the road to prison

Con (condensation) or vapour trails are artificial clouds that are the visible trails of condensed water vapour made by the exhaust of aircraft engines. As the hot exhaust gases cool in the surrounding air they may precipitate a cloud of microscopic water droplets or, if the air is cold enough, tiny ice crystals. - Wikipedia

Usually they appear as two straight lines, but in this case I presume wind cross-currents have disrupted the linearity to create turbulence.

Didja know? Physicists use a variant of this notion to track collisions of sub-atomic particles in so-called "bubble chambers." They make beautiful patterns.