Maybe they're wondering who lives down there on that flat yellow plain, right about the time I'm wondering about them. I wonder if people in jets ever think about the vapor trail they're making. I never do, when I fly. In fact, I just now thought about it for the first time. All these years of flying here and there, and I never once thought about making white streaks in the sky for people on the ground to admire.
Planes have windows for seeing side to side, up and down, and forward.
But you just can't see where you've been, or what kind of trail you're leaving, without asking the pilot to kindly turn the plane around. This is not recommended. When I was a kid, sky writers in airplanes would spell words in the air. It would just be two parallel lines. Everyone would stop what they were doing to watch.