1. With respect to your color balance and exaggerated clouds - One has to be very, very careful when intentionally imparting "a look" like this (which includes color grading) to a client's image. If at all possible, I will schedule a planning meeting and load my iPad with a bunch of pix with similar content, but different looks and carefully observe the client's reactions to each. So, instead of inadvertently biasing their opinion by showing them pix of their jet and what effects you like, showing them other examples to which they have no emotional attachment will yield a vastly more accurate understanding of what they like, and what they don't like.
Personally, for a client job like this (as contrasted with an attempt at photgraphic art), I would never have clouds with a yellow cast and exaggerated local contrast. However, each client and each photographer is different, so you absolutely must check with them before start work on such a project.
2. In contrast, there are two aspects of this picture that could clearly be improved, and which wouldn't be controversial in the least:
(a) the houses and other structures that clutter up the background; and,
(b) the tarmac.
Clone out the buildings in the background, and give your customer a nice uncluttered horizon line. Next, desaturate, reduce the contrast, vignette, fix the cracks, paint out the lines, and reduce all the remaining details (ie, structure) visible in the tarmac. The way it currently is, one's eyes are immediately torn between multiple centers of interest in these pix, whereas it should be very clear that THE center of interest is the jet -- not the tarmac, nor the houses in the background, nor the clouds. I regularly shoot pix of big trucks in parking lots (not jets on a tarmac), and I will almost always fix up imperfections and distractions in the road surface and and generally make the road much less visually interesting.
HTH,
Tom M