I don’t know why I’m even going to bother, but…
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Behold, a teensy, tiny, itty-bitty snapshot of an IFR route chart. When people joke about “highways in the sky,” it’s not a joke, we actually use established routes. So it’s HIGHLY unlikely you’re seeing the exact same contrail, but rather another one left by another plane that followed the same route. Literally dozens and dozens of planes may be using the same route on any given day, especially for contracted routes that run (wait for it) the same route, every day, day after day. Given similar meteorological conditions, it may look like the same trail, but it’s HIGHLY unlikely it would be.
These threads always show just how little most people know about subjects they’re not highly trained in. Aviation is dark magic to most of the world’s population, and it shows…