Sweet lookin' plane, Art! Love the paint... too bad about the windows. If it makes you feel any better, I've done it before too.
If you feel up to it, mask around those windows and wet sand them with some 800 grit paper and maybe follow up with a light wet sanding of a finer grit like 1200. The idea is to smooth out that flat coat some. Once it feels nice and smooth, just brush some Future on those windows. Even if it's still hazy, the Future will make it look much better. I know it sounds like a pain in the butt, but the hardest part is masking around the windows and you don't even have to be perfect at that because you can touch up any spots of paint you might have damaged while sanding with a small brush. HTH
Now... after seeing yours, I need to get one!