[RobRoy]

>>Note that in frame 5, (shown firat and repeatd) the endpoint (even at wide zoom level) is far beyond (after) the crossing.<<

Um,it’s closer. It is also not an end point. It is where the contrail was when the video clip ends.

[TXnMA]

Beyond (later IN TIME) -- and the endpoint is, as you say, where the contrail-forming object (plane) is in the last frame of that clip. And, of course, it was coming toward you...

(We agree.)

There is almost no way to say that succinctly and in such a manner that it cannot be misconstrued. Believe me -- I tried many variant wordings...