A start with some local photos taken in Saint Tammany Parish. A smoking gun time-lapsed video of a single all day massive spray event,
from three perspectives, underneath, just outside of edge panorama, planes in action, would be ideal. That is a goal of mine. In the
meantime I've taken some simple stills of fairly light sprays.

These pictures were taken on Sunday, 3-9-8. Here is what a normal jet contrail looks like, dissipating as it goes.

In the same sky, at the same time, here is a culprit.

Another shot of same culprit as it went on towards Lake Pontchartrain. Note the haziness, clouds near the bottom of the shot, behind the trees.
Those are phony clouds, as will become clear enough as this sequence progresses.

Another one, running parallel to the first.

Another shot of same one, as its trail extends further behind it.

A number of parallel lines made.