The only other possibility I can think of along these lines, I saw a fella once that quit smoking or something and was real nervous
and he kept scrubbing his feet on the floor. Since your feet are on the rudder pedals, this isn't too likely.

Another trick I have used to isolate a source of static, swipe your wife's Static Guard and spray the carpet and the seats and see
if the problem goes away....

Let us know what you find.

Mike Z