Why?
Why do so many people make 9/11 songs to this song? The subject matter isn't even close! Goodbye Blue Sky is a little bit about the Blitz of London, and mostly about a kid growing up without a dad because he died in WWII. And besides, you'd think the only major event that Americans know about this days is 9/11. There have been many things worse than 9/11, several of them done by America. Hiroshima? Nagasaki? Way worse. I mean, yes, many people died on 9/11, but was all of New York destroyed? No. Hiroshima and Nagasaki were dessicated. I hardly hear anything about those. But 9/11? Every year, everyone gets so worked up about it, making movies, getting pissed off at the people who make movies, yadda yadda yadda.
Now I'm going to stop ranting and move on to the actual review.
Basically, it seemed like a concept sketch. It had an okay concept, but was not developed enough. You might want to work on the animation a bit, too- it was fairly crude. Oh, and the beginning did not seem to have any relation to the subject matter. Whatsoever.
And for the record, I am American. I am not an anarchist or a whiny idiot. I just hate it when idiots whine about things they shouldn't be whining about.