Breakdown of the matrix? LMAO…here, lemme break this down for you. The chemplane is flying above a smog or haze layer and the sun happens to be in an "almost" direct line with the observer and the chemtrail. The sun is casting a shadow of the chemtrail onto the smog/haze, and because the plane is past the sun from the viewer's perspective, the shadow "appears" to be in front of the plane. If you hung up a sheet with a light behind it and had someone hold a ball up in between them, as you moved the ball to either side, the shadow of the ball on the sheet would eventually pass "in front of" your direct line of sight of the ball.
I literally can't even believe I took time out of my day to explain this…smdh.