:-) As a gag, this is just about perfectly done, I think. The blank deep blue canvas of your background is essential - a more 'interesting' cloudy sky would wipe out the point absolutely. The partially focussed remains of the plane likewise - perfect stop motion would work against the idea of photographic incompetence that makes this work. The square composition allows the point where the plane exits to be still quite strong - though i wonder if placing it mid-frame in a landscape frame mightn't be just as effective. Also I think you might have been even 'braver' - and included simply the final part of the tailplane - the absolute minimum to impart your meaning. Often, in this kind of stuff, less is more. Nice work - can't see it scoring too high, but then what do I know?
6 - One of the very few who actually 'Met the Challenge' (my interpretation at least), well done, it was not easy. Criticism; difficult to comment (and indeed vote) given the nature of the Challenge .. especially on this one. I like the use of space though, perhaps slightly less 'height' may have worked even better, not sure.
Congratulations on being one of few entries to meet the challenge description! Bonus points for that, but would be nice if the plane were in focus. Perhaps you took the picture too soon!
finally an image that captured something too late and I'm on page 3 of the entries! Most would probably say it has to be sharper but this adds to the idea that you were hurrying and just missed it. Good job and good luck.