Lanefan
Victoria Rules
Fantasy air forces comprised of a party of flying PCs are - in play - as common as dirt IME after about 5th level.I would call fantasy air forces rather rare in my experience.
In a setting where it's known powerful people can fairly often get into the air somehow (e.g. flight spell, devices, airships, natural wings, etc.), one would probably build one's castle with defense against that in mind.
That said, if your castle courtyard has some sort of anti-flight magic above it such that anything bigger than a hawk flying over or into it crash-lands on the spot, then now you're talking.

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