I think you're greatly underestimating the number of GA / Piston aircraft flying.

At my school, we have ~10 aircraft flying every day, 8-12 hours a day depending on the weather. Most of these flights happen over prime, in production farmland, or on the edges of the nearby town which has 8 schools at a minimum.

Now we're one of probably 5 aviation schools within a 50 mile radius, all of whom are operating at similar or greater profiles.

I'm sure the individual impact is small, but for every jumbo jet there's something like 3-5 piston aircraft in operation.