Just how number crunchy do you want? To use things more towards each end, Swashbuckler of the Seven Skies has some crunch to it but is pretty light, and should work beautifully. As always, GURPS is a functional option, but it's extremely crunchy. In the middle there's less that I know about, but you might be able to hack Warbirds into functioning. It emphasizes planes pretty heavily, but there are airship rules, though the focus there is on plane-airship fights.