Way back in another life I used to be involved in helping people write CVs and apply for jobs. The basic rule as far as hobbies and interests is concerned is to sound like a well rounded person, but not to appear to have so much outside your job that you won't have time to work. I'd tend to put it under "Hobbies and Interests" or "Other Information" as something like "In my spare time I fly light aircraft,...etc, etc". That way they can ask about it if it grabs them, but it doesn't sound like a big deal if it doesn't.