I dont know about the ones you've seen, In San Diego, CA & Nevada(all over), & Arizona(all over) & Salt Lake City.... I go outside to smoke because people are big pussies. I smoke too much. I go outside at 10am-10:15 I smoke and watch a few trails get sprayed down. I come back around noon and lunch and smoke a bit more outside, the same trails are there, they grow and ALWAYS gravitate toward the SUN shining brightly. By 2pm smoke break, the sky is grey, the entire visible sky. It doesnt rain either, not black clouds. Grey like snowclouds in the midwest, but ofc no snow either. I've seen it. these eyes here. day after day after week after month. Contrails dissipate in moments, not even minutes, chasing right behind the plane. I was alive in the 90s. I remember. These things stay for hours and create cloud cover without rain and block out the sun. I had heard of chemtrails but only later I saw my first ones, in San Deigo, which were massive, it looked like a ballistic missile but slower, I was so relieved to see they were huge planes. For a hot second I thought a war had started. It was the DAY AFTER Fukushima happened and everything was tense. Then it kept going for years, I had been in San Diego for 5 years at the time, I had never seen anything like it until then and it continued until I left. The ones folks photograph and yikes about, are these growing ones, I can vouch for that part, I've seen it, I've sat in my car and watched it. I've clocked it throughout the day in my routine, casually observing and going "hmmm, thats odd" Normal Clouds dont do the shit these do.