Like your choice of white balance shift. If the sky wasn’t vibrant blue, than there wouldn’t be much interest since it would be so normal. The warm tone makes it feel old-time or historic.
I’m glad it’s not a photo of a single plane dead center in the frame. The off-centered subjects are important, and it’s nice to have those clouds on the right to balance it out.
I don’t exactly know how I would better frame it. I don’t really know how I would better shoot an airshow frankly. The more planes in the pic the better I would assume.
In processing, perhaps increase the Clarity or sharpness.