And you certainly can’t tell if one plane is at the same altitude as another. These planes fly at 30,000 to 40,000 feet. Let’s see what the visual difference is at around that altitude: I took one image of a jet nominally at 35,000 feet. Then scaled it for 34,000 (102.9%) ...
Well, no I don’t like pollution at all. I don’t think many people do. I think it would be great if planes could fly without emissions. I’d prefer there to be no contrails if possible. I think they are essentially visual pollution. But I’m interested in them, and they do some...