This is what I wrote in May 2015.
7:30 PM. That heavy trail, as it turns out, was the first of a wave of intersecting trails that followed. There was the classic tic-tac-toe configuration that I have not seen in a long time.
Wow! As I was sitting here watching this I heard the increasingly loud sound of an air vehicle. It got so loud and lasted so long I thought it might be a low flying helicopter. Though I live not far from the municipal airport, no plane has ever flown so low in the twenty years I have lived here. I wanted to go out and take a look at what this was but by the time I decided to do this the sound had began to wane. So I decided not to. Then, about two or three minutes later the sound approached again. I got outside just in time to see a massive four engine military tanker flying low overhead. It was headed east, the general direction of the municipal airport but it was turning towards the south, which would take it away from the airport. Its destination was clearly somewhere else. I did not know if this was the same plane I had heard a few minutes earlier circling back or if this was a companion tanker following the path of the first plane. No, the plane was not spraying. But it is probably one of the planes. Cargo plane? Possibly. The closest thing I can find on the web that resembles what I saw is the C 17:
Four engine. Wide body. Flared wingtips, very distinctive. Flying low enough to see it clearly. Cargo? No doubt it would be easy to convert such a plane into an aerosol tanker.
What I saw that day was kind of like this, but further apart, since the first plane had disappeared by the time I got outside.
Another instance of low flying C-17s. This is about the altitude they flew over my house that first time.
I’ve seen this happen too, where it dips below the tree line in the distance.