The person wouldn't see the aircraft as it is obscured by the contrail itself as it is in front of it.
Hi Castle thanks for the prompt reply.., would you be so kind as to answer my other question about the black contrail? Comment #6.
Your answers always speak with 100% certainty.., but you have been wrong in the past before. So I need to evaluate each answer carefully as I don't think you put much effort into "debunking" something.., or seeing things from a different perspective or look at others ideas. Or question your first opinion or participate in discussions.
I guess I'm a bit of a stickler for proof and seeing the math and work shown. I get that smoke or vapour can shroud an object.., but I'd need to confirm it.., or at least show examples. Its possible that the object is very large (plane) and the black trail is obscuring it which gives a big hint about its flight trajectory.., or the UFO is very small with a large black trail of smoke or vapour (like a missile perhaps).
"It looks like.., so it's most likely" doesn't cut it for me. That's been UFOlogy for the past 80 years.., and its time for a change.
Perhaps an option would be to figure out the largest size an airbus / fighter jet's contrail could possibly be.., and use that as a reference point for size and distance.