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A couple of times, I have flown into small airports in downstate Illinois (where I grew up) and my favorite little notice was at the Decatur, IL airport which is run by the city's park district (go figure!).
There was a sign in the parking lot asking you not to park in the first row if you were going to be gone for more than a week. No charge for the parking, just leave your car there and it'll be there when you get back, perhaps covered in snow, but still there.
The tiny airport in my hometown of Champaign-Urbana, IL was until not too many years ago a 1940s era cinderblock building, but in the 90s they built a cute little terminal with four gates which is quite efficient and useful.