The picture is just a little fuzzy in terms of focus - I'd have liked it either softer or crisper. The buildings capture and hold my attention more, given the variety of shapes and tones there, than the sky does.
The texture of the clouds is very intersting, like they are flowing water or something. The whole image appears slightly on the dark side tho, although it maybe because it is nearly evening time. I wish the plane were a little larger because after all it is supposed to be your main subject in the photo.
A nice photo, I like the clouds and the buildings against it, but I find the airplane which I would figure should be the emphasis gets a bit lost in the image. I'm not sure cropping would've helped though, as a plane against clouds might be too bland.