I need help from my readers to explain the strange phenomenon I just observed outside. Can you, please, look at the photos and tell me what caused this strange white line in the sky? It causes me intense anxiety because I can’t explain it. For decades, I have been suffering from nightmares where airplanes fall from the sky and when I saw this I immediately imagined a falling airplane. Which gave me an intense panic attack. I’m hyperventilating and shaking right now. And I’m going to go and do some breathing exercises.