I think this will continue to struggle. I think part of your problem appears to be the lighting - it seems quite harsh. Thus there is a 'monotone' feel to the shot, with the white fuselage being very white, and the dark shadows very dark. That underwing area is pretty well black, and so the degree of contrast is tricky as it is. The sharpening is also troublesome, by the look of it. The dark cheatline does have small jaggies on either side of it, which are at the limits of acceptability in my opinion, and the other lettering looks slightly oversharpened.
I would gladly take a look if you would like a second edit opinion.
All the best.