Michael, thank you. I added the model to my next order.
I have heard of Check your 6!, but don't use it. I don't play exclusively air combat games, at least not now, and simpler rules are included in the wargame rules that I do use. Perhaps I may take a look at CY6 at some later stage to complexify my game a little, but I doubt I would adopt it for games, unless I wargame air superiority combats over my ground ops.