Airport Appreciation Days are coming back around this September! This is a family friendly event with something for aviators of all ages. The event will have vendors from around the area, Cliff Robinson Bi-Plane rides, and paid helicopter rides! Airport Appreciation Days are Saturday, September 8th from 9 AM – 4 PM and Sunday, September 9th from 11 AM – 4 PM. The Putnam County Regional Airport (KGPC) is located at 100 Ballard Lane, Greencastle, IN.